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  • Triticum aestivum  (27)
  • Springer  (27)
  • 2025-2025
  • 1975-1979  (27)
  • 1977  (12)
  • 1976  (15)
Collection
Publisher
  • Springer  (27)
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  • 2025-2025
  • 1975-1979  (27)
Year
  • 1
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    Springer
    Theoretical and applied genetics 50 (1977), S. 47-51 
    ISSN: 1432-2242
    Keywords: Glutamate Oxaloacetate Transaminase ; Isozymes ; Triticum aestivum ; Subunits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A simple procedure has been developed for the dissociation of active molecules of glutamate oxaloacetate transaminase (GOT: E.C. 2.6.1.1) into protomers and for the reassociation of the subunits into active enzymes. Results of experiments in which the protomers of genetically controlled electrophoretic variants of GOT of Triticum aestivum and of several related species were dissociated and recombined in crude tissue extracts and in partially purified preparations support the hypothesis that the enzyme exists functionally as a dimer in the Triticinae.
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  • 2
    ISSN: 1432-2242
    Keywords: Triticum aestivum ; Wheat ; Endosperm ; Protein Synthesis ; RNA Level ; Amino Acid Translocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The kinetics of protein accumulation, the variation in RNA, the soluble amino nitrogen content of developing endosperm of two varieties of Triticum aestivum, with high and low protein content in the mature seed, suggest a possible relation between maintenance of the RNA content and the ability to synthesize protein. A sudden halt in protein accumulation is observed as the RNA starts to decrease. The hypothesis is also advanced that maintenance of the RNA content might, in turn, be dependent on the presence, in the endosperm of developing wheat seed, of a certain level of soluble amino nitrogen which could then play the role of limiting factor for protein synthesis.
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  • 3
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    Euphytica 26 (1977), S. 475-479 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; anthocyanins ; centromere ; chromosome mapping ; crossover units ; dominant genes ; monosomics ; partially dominant ; purple coleoptile ; suppressors ; telocentric chromosome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The association of genes for purple pigment in the coleoptile with the chromosomes of the winter wheat variety Mironovskaya 808 was investigated using monosomic F2 analysis. The segregation ratio for F2 hybrids of Chinese Spring monosomics x Mironovskya 808 seems to indicate that the purple colour of the coleoptile is determined by two dominant genes, Rc3 and Rc4, which are located on the chromosomes 7D and 6B respectively, and which reinforce each other. Apart from these two genes, suppressors found on the chromosomes 2A, 2B, 2D, 4B and 6A also play a role in the intensity of the purple colour. With the aid of a Chinese Spring telocentric chromosome marker it was observed that the Rc3 gene is located on the chromosome arm 7DS, at a distance of 16±4.23 crossover units from the centromere.
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  • 4
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    Euphytica 26 (1977), S. 739-744 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; flag leaf area ; grain yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Five spring wheat crosses were evaluated over a 6-year period using comparisons between F2 and F3 data and between near-isogenic F4 populations selected for flag leaf area. Nonsignificant r values for F2 vs. F3 flag leaf measurements may be due to the effect of environment on flag leaf area, but are probably also an indication of low heritability for this plant character. Near-isogenic populations selected on the basis of flag leaf area showed little difference in grain yield, an indication that other plant parts must be more influential in determining grain yield. Flag leaf area, by itself, appears not to be a good index to plant performance.
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  • 5
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; pre-harvest sprouting ; Tom Thumb derivatives ; GA3 response index ; apparent α-amylase synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Segŕegating populations of the cross Tordo (a spring white-grained Tom Thumb derivative) and Tr 454-16 (a spring white-grained Sonora-Gabo derivative) were studied for plant height, apparent α-amylase synthesis (AAS) and response to gibberellic acid. Means, variances and heritabilities for these characters were computed and their association was studied by computing correlation coefficients. Plant height showed high heritability while AAS and response to GA3 showed moderate heritability. Plant height was positively correlated with AAS and response to GA3. The results pointed out the importance of using Tom Thumb as a source of pre-harvest sprouting tolerance in a wheat breeding programme, particularly in areas where wheat breeding is restricted to evolving white-grained cultivars.
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  • 6
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; stem rust ; Puccinia graminis tritici ; generalized resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Four morphological characteristics of wheat peduncles were evaluated for genetic and environmental variability. The thickness of the epidermis and the amount and distribution of chlorenchyma tissue in the peduncle were measured. The genetic variability was estimated to be large, whereas the environmental variability was small. It was also concluded that cultivars could be screened for morphological characteristics of the peduncle that contributed to non-specific resistance to stem rust with a minimum sample size of about 10 plants per replication from a single location.
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  • 7
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    Euphytica 26 (1977), S. 129-139 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; grain yield ; tall plant ; semidwarf plant ; adaptation ; dryland ; regression analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary With a view to determining the comparative adaptation of semidwarf wheats to rainfed conditions, adaptation analyses were carried out on grain yield data of the 6th and 7th International Spring Wheat Yield Nurseries of the International Maize and Wheat Improvement Centre. Sites were chosen which had not received irrigation: across a combined total of 44 such sites, yield variation was closely related to growing seasonal rainfall. Using these sites, yields of thirty-three common cultivars. Norin 10-derived semidwarf cultivars plus tall ones, were regressed against site mean yield to give a regression slope (b) and deviations from the regression (sd 2) for each cultivar. Semidwarf cultivars generally showed higher mean yields and larger regression slopes (b 〉 0.9) than tall cultivars from lower latitudes. Tall cultivars from higher latitudes showed the lowest mean yields and the lowest b values (〈 0.7). No consistent trends in sd 2 were evident. Despite the greater regression slopes of semidwarf wheats, the best yields under all but the lowest yielding (driest) conditions were given by certain semidwarf cultivars; these had high mean yields and b values close to 1.0 (for example Tobari 66, Inia 66, Pato ArGentino and Sonalika). In contrast other semiwdarfs (notably Chenab 70) of similar mean yield, plant height and phenology, were not well adapted to the drier conditions as indicated by b values close to 1.3. The usefulness of the regression technique and the implications of these results for selection of semidwarf wheats adapted to drier conditions are discussed.
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  • 8
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    Euphytica 26 (1977), S. 299-308 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; pre-harvest sprouting ; components of resistance to sprouting ; complex resistance (RCP) ; α-amylase synthesis ; GA3 response ; wheat endosperm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The problem of pre-harvest sprouting in wheat is very intricate. New concepts in breeding for resistance to pre-harvest sprouting regard many components such as α-amylase production potential, response to gibberellic acid and inhibition in the bracts as important as dormancy. In the research work carried out at The University of Sydney's Plant Breeding Institute, we found varietal differences for each of these components. We also developed criteria for screening breeding material for these components. The implications of our findings in planning efficient breeding programmes to evolve varieties with multiple resistance to pre-harvest sprouting have been discussed briefly.
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  • 9
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; bread wheat ; Triticum timopheevi ; fertility restoration ; cytoplasmic male sterile ; percent fertility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Fertility restoration genes in Triticum aestivum L. in Texas Restorer Composite (TRC), D6301, and four CIMMYT restorer lines were studied, and selection was made for higher fertility in TRC. Mean-while, outcrossing percentages of seed set for 27 spring habit cytoplasmic male sterile (cms) varieties were evaluated for 3 to 5 years at Davis. The winter-habit TRC material did not restore reasonably good fertility, and the response to selection for higher fertility seemed to be slow. This poor fertility could be partly due to its late winter growth habit causing flowering at a period of high temperature and low humidity at Davis. The highest F1 fertility was 46.6% in the cross cms Ramona x TRC-6, and its F2 segregated into the ratio of 15 fertile to 1 sterile, with fertility ranging from 3.2 to 100%. Suggested for its improvement was intensive selection in the original TRC material and in the segre-gating F2 population, followed by intercrossing. D6301 has 2 fertility restoration genes with different strengths which restore fertility up to 45.2% when both genes are heterozygous. D6301 is quite likely heterogeneous for these genes. Four CIMMYT restorer lines, D7464, D7465, D7466, and D7467, had satisfactory F1 fertility restoration after crossing with cms Ramona 50. In 1975, the fertilities of the F1's ranged from 71 to 85% and were over 90% in 1976. The F2 population of the cross cms Ramona 50 × D7464 segregated into a ratio of 3 fertile to 1 sterile, indicating that D7464 has a single dominant gene for fertility restoration. The F2's of crosses cms Ramona 50 × D7465, cms Ramona 50 × D7466, and cms Ramona 50 × D7467 gave a ratio of 15 fertile to 1 sterile, indicating that two gene pairs in these three lines were responsible for the fertility restoration. The best of this group was D7467 which restored fertility fully after being crossed with cms Ramona 50 (T. timopheevi cytoplasm). The early-flowering cms male-sterile varieties had higher outcrossing rates (16 to 38%) than late varieties (6 to 30%) over a 5-year period. This was due to hot and dry weather during the late growing season as well as to the rarity of windborne pollen. In 1970, 1971, 1972, and 1976, the variation among varieties was rather great. Some of them such as Roque 66 and Bajio 67, had consistently high outcrossing rates. This outcrossing ability seemed to be inherited and probably associated with the open-flowering characteristics of each variety.
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  • 10
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    Euphytica 26 (1977), S. 89-95 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; Heterodera avenae ; cyst nematode ; resistance breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The use of soil. naturally infested with Heterodera avenae, to select resistant heterozygotes in backcross progenies of wheat, was tested for reliability. Selfed progenies from plants selected as resistant were cultured monoxenically in test tubes with nematodes hatched from single cysts, while backcross progenies from the same parent plants were grown in pots of naturally infested soil. Cyst counts were made after two months' growth. The results showed that over 50% of the backcross lines, screened in previous generations with naturally infested soil, had been erroneously selected as resistant. The test tube cultures clearly differentiated lines carrying resistance from those which were susceptible and corroborated results from pot tests.
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  • 11
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    Euphytica 26 (1977), S. 103-112 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; hybrid wheat ; male sterility ; cross pollination ; seed production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Several chemicals were evaluated for their gametocidal properties to control pollination in hybrid wheat (Triticum aestivum L. em Thell.) seed production. In a preliminary study, four chemicals were applied to three cultivars of spring wheat at two application times. RH-532 was the most effective of the four gametocides, reducing fertility to a 0 10% level for all three cultivars. In a second experiment, RH-532 was applied to one cytoplasmic male-sterile and three normal spring wheats at four rates (0.56, 1.12, 2.24, and 4.48 kg/ha) and at two times of application. Alternate strips of pollinator were planted throughout the experiment. All treatments decreased fertility. plant height, and spike length of the three normal wheats. RH-532 did not inhibit spike emergence of two semidwarf cultivars or one of conventional height. Cultivars did not respond similarly to treatments. Yields of cross-pollinated seed were only 1 21% of the normal yield when fertility levels on treated plants reached 0 10%. Hybrid seed content of the harvested seed ranged from 2 55%. On the treated male-sterile line, yield was significantly reduced in comparison with the open-pollinated check. Inhibitory properties of this chemical suppressed the fertilization potential of the female as well as inducing male sterility. The differential response of genotypes to treatments indicates that cultivars should be screened for male and female sensitivity to this chemical. If differential sensitivity is found, breeding and selection to improve this trait may be possible. Different environmental conditions may alter the response of cultivars to this chemical, with less effect on the female structures.
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  • 12
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; Secale cereale ; rye ; intergeneric cross ; fertilization ; early post-fertilization developments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Fertilization and early seed development was studied in the variety Chinese Spring of common wheat (Triticum aestivum L.) after pollination with rye (Secale cereale L.) and selfing, and in the common wheat variety Hope after selfing. In all three combinations the first pollen tube reached the micropyle in about 40 min after pollination. When pollinated with rye the migration of the sperm nuclei to the egg cell and the polar nuclei was delayed by about an hour. In the subsequent development until 72 hours after pollination the average cellular and nuclear doubling times of embryo and endosperm were about 16 and 8 hours for the interspecific combination. 18 and 9 hours for Chinese Spring selfed and 20 and 12 hours for Hope selfed.
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  • 13
    ISSN: 1573-4927
    Keywords: chromosome substitution ; nitrate reductase ; nitrite reductase ; acid proteinase ; Triticum aestivum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The levels of nitrate reductase, nitrite reductase, and acid proteinase were compared in the primary leaves of 8-day-old wheat seedlings of Chinese Spring, Hope, and the 21 disomic substitution lines of Hope in Chinese Spring. Two chromosomes, 7B and 7D, were considered to contain genes controlling the level of nitrate reductase. Substitution of Hope chromosome 7B caused a highly significant increase in the in vitro stability of nitrate reductase. Nitrite reductase appeared to be controlled by two major genes, located on chromosomes 4D and 7D, and two minor genes, located on chromosomes 3D and 5A. In the case of acid proteinase, substitution of chromosome 1D caused a significant reduction in enzyme activity.
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  • 14
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    Euphytica 25 (1976), S. 387-391 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; Hordeum vulgare ; barley ; screening nursery ; distance between control plots ; protein content ; correlation coefficient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Correlation coefficients were calculated in two seasons, between protein content of control plots of ‘Kyperounda’ durum wheat and ‘Athenais’ barley sown at distances of from 0.6 m to 68.4 m. Simple correlation coefficients were high (0.737, 0.710 and 0.311) and significant at the 1% level of probability for plots 0.6 m apart, but decreased rapidly with increasing distances between plots. The correlation in four nurseries was significant for plots 7.2 m, 4.2m, 4.2 m and 1.8 m apart. It was concluded that a control plot provides a fairly good measure of the protein content of adjacent plots.
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  • 15
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    Euphytica 25 (1976), S. 375-386 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; gametocide ; pollen stainability ; male sterility ; female sterility ; hybrid seed ; hybrid wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The gametocidal effects of RH-531, RH-532, and RH-2956 were studied with three rates and times of foliar application on two spring wheat (Triticum aestivum L.) varieties, Anza and Yecora 70. RH-531 and RH-532 applied at or before booting stage caused rather large reduction in plant height while RH-2956 had a small effect on height. Application of any of the three chemicals on ‘Anza’ at meiotic stages reduced self-pollination (SP) fertility by 97–99%. If 90% SP fertility reduction is acceptable, the application time could vary from premeiosis to postmeiosis for ‘Anza’. ‘Yecora 70’ was less sensitive than ‘Anza’ to gametocide treatments. The lowest SP fertility obtained in ‘Yecora 70’ with RH-531, RH-532, and RH-2956 was by treatment at booting (4 kg/ha), at premeiosis (2 kg/ha), and heading (8 kg/ha), and the corresponding SP fertility reductions were 74, 89, and 71%. Pollen stainability-determined by aceto-carmine, IKI, and Alexander's stains-was not affected by gametocide treatment and was not useful in evaluating sterility induced by these chemicals. For the RH-531-treated ‘Anza’ and ‘Yecora 70’ and the RH-532-treated ‘Anza’, more than 94% of the seeds produced by open-pollination on treated plants were from self-or sib-pollination as determined by progeny testing. However, RH-532-treated ‘Yecora 70’ and RH-2956-treated ‘Anza’ and ‘Yecora 70’ did result in more crossed seeds, with a maximum of 20% outcrossing. It was believed that spike compactness induced by the chemicals and the related poor flower opening were the major limitations for outcrossing. Artificial pollinations made to the test varieties showed that RH-531 induced both male and female sterility and was undesirable for practical use. RH-532, however, could be applied at the booting stage to avoid severe female sterility, and RH-2956 clearly was the best of the three chemicals, with the female fertility very close to those of the untreated checks of both ‘Anza’ and ‘Yecora 70’. Of the three chemicals, RH-2956 gave the highest percentage of hybrid plants in the progeny of hand-or open-pollinated spikes. Its practical use for hybrid seed production, however, will depend largely on improvement of methods to increase cross pollination in wheat.
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  • 16
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    Euphytica 25 (1976), S. 457-461 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; leaf angle ; erect leaves ; diallel ; additive gene effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A 6×6 diallel was prepared to study the inheritance of leaf angle in T. aestivum L. Genetic analysis in terms of diallel cross parameters and graphic analysis indicated the control of additive gene effects in the expression of this character. The results of F1 analysis were supported by the analysis of F2 data.
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  • 17
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    Euphytica 25 (1976), S. 471-483 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat hybrid weekness ; hybrid grass-clump dwarfness ; hybrid dwarfness ; physiology ; genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The growth of all grass-clump dwarfs is sensitive to temperature with low temperature giving rise to the grass-clump phenotype and high temperature producing normal phenotype. A continuous temperature of 26°C is required for normal growth of Type 1 dwarfs, a continuous temperature of 21°C is required for normal growth of Ty[e 2 dwarfs and a continuous temperature of 16°C is required for normal growth of Type 3 dwarfs. Genetic studies show that the inheritance of the grass-clump characteristic is due to three complementary dominant genes. The grass-clump growth habit is produced as a result of the temperature sensitivity of the apical meristem. In grass-clump plants low temperature treatment results in the cessation of cell division, DNA synthesis and phospholipid synthesis in the apical meristem. The primary temperature lesion has not been identified. Prolonged low temperature treatment of grass-clump plants results in extensive cell necrosis in a region just below the apical meristem; this cell death results in the permanent inactivation of the apical meristem.
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  • 18
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    Euphytica 25 (1976), S. 489-498 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; photoperiodic sensitivity ; maturity ; genetics ; adaptation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Photoperiodic respose, as assessed by a regression technique, exhibited complete dominance averaged over the crosses of an eight parent diallel in the vernalized condition. Photoperiodic response as final leaf number for the vernalized 8-hour photoperiod diallel was closely related to photoeriodic response of the regression method. However, the diallel analyses of both sets of data showed little agreement in terms of respectieve array positions. The inheritance of photoperiodic response in diallels using regression values showed little agreement between the vernalized and unvernalized conditions. This difference was postulated to be due to interaction of vernalization and photoperiodic response in the unvernalized situation. In the unvernalized condition photoperiodic response exhibited non-allelic interaction, attributable mainly to the cultivar Pinnacle in general behaviour in its crosses. Its removal gave a situation of high average dominance for photoperiodic response with a clear indication that high photoperiodic sensitivity was dominant to comparative insensitivity. Days to ear emergence (vernalized and 18-hour photoperiod) exhibited non-allelic interaction in its expression, due mainly to the general behaviour of the cultivar Pinnacle in its crosses. Removal of its array gave a situation of a moderately strong degree of overdominance in the expression of days to ear emergence. Maturity differences amongst parents and F1's, vernalized and under 18-hour photoperiod, are postulated to be due to a factor other than vernalization or photoperiodic response beheved to be growth temperature in differentially in fluencing growth and/or developmental rates between genotypes.
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  • 19
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    Euphytica 25 (1976), S. 565-576 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; chromosome substitution lines ; kernel hardness ; baking absorption ; dough stability ; baking quality ; genetic analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary An attempt was made to identify the chromosomal location of genetic control of a few components of wheat quality, using chromosome substitution lines of Cappelle Desprez, Cheyenne, Hope, and Timstein into the recipient variety Chinese Spring. Major factors for kernel hardness and increased baking absorption were found on chromosomes 5D of Cheyenne and Hope, and on 3B, 5D and 7D of Timstein. In Timstein, the presence of one of these chromosomes sufficed to make the wheat kernels hard. Factors for favourable dough properties were identified on a few other chromosomes, different in various varieties. These were 1A of Cappelle Desprez and Cheyenne, 3B of Hope, and 2D of Timstein. All but one of these chromosomes showed an increase in loaf volume to a level in-between those of the recipient variety Chinese Spring and the donor varieties. No relationship was found between kernel hardness and dough-making and baking properties. It was assumed that wheat quality is due to a combination of kernel hardness and favourable dough-making properties. As the genes for these factors are located on different chromosomes, it should not be too difficult to introduce both factors in existing varieties with poor baking properties. In a wheat breeding programme, the quality of new lines can be assessed in a rather simple way by determining kernel hardness and dough stability.
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  • 20
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    Euphytica 25 (1976), S. 415-418 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; germination ; immature grains
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The results indicated that acceleration of generation time in wheat was practical. The method developed by Mukade et al. (1973) was improved by extending the hydrogen peroxide treatment at low temperature.
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  • 21
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; chromosome substitution ; protein content ; grain weight ; genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The 21 intervarietal chromosome substitution lines of the cultivar Hope in Chinese Spring were used to analyse the genetic differences between the two cultivars Hope and Chinese Spring in grain protein content and grain weight. Only one chromosome of ‘Hope, 5D’, significantly influenced grain protein content of ‘Chinese Spring’. Its influence was of only minor effect and was to decrease protein content expression of ‘Chinese Spring’. It has been postulated that the genetic control of protein content, in this instance, is most likely due to many genes each of small effect. Five chromosomes of ‘Hope’ influenced the 1000 grain weight value of normal ‘Chinese Spring’, all increasing its expression. Chromosomes 1A, 4A and 5B were of major effect and 3A and 6A of comparatively minor effect. A minimal estimate of five genes determines the difference in grain size between these cultivars. The possible evolutionary significance of the contribution of the A genome of bread wheat to grain size determination is discussed. On the basis of certain findings of this study, proposals are made for breeding for increased grain size in hexaploid wheat.
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  • 22
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    Euphytica 25 (1976), S. 769-775 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; Alternaria triticina ; leaf blight ; resistance ; genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Genetics of field resistance to Alternaria triticina was studied in a diallel set of crosses using ten cultivars of wheat which included eight resistant and two susceptibles. Susceptibility if NP 830 was found to be controlled by a dominant gene and that of NP 891 by two dominant complementary genes. The resistant cultivars NP 824, NP 835, NP 852, C 281, E 5477, E 5550, E 5878 and UP 303 carry the recessive alleles of the genes present in NP 830 and NP 891. All the resistant cultivars used in the study carried identical gene(s) for resistance to A. triticina. The gene(s) responsible for resistance appear to have come from NP 4 and Turkey, both of which seem to have evolved simultaneously in nature. The gene(s) for susceptibility in NP 830 and NP 891 were found to be different. It is assumed that these genes come from either Motia (Triticum durum) or Khapli (T. dicoccum) in NP 830 and from Gaza (T. durum) in NP 891.
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  • 23
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    Euphytica 25 (1976), S. 41-50 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat harvest index ; pattern of variation ; degree of dominance ; heritability ; genetic coefficient of variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Harvest index was studied in F1 and F2 generations of eight wheat (Triticum aestivum L.) crosses and their reciprocals. The parental varieties involved in the crosses represented a fairly wide range of character expression for plant height, tillering potential, grain yield per plant and harvest index. Differences between reciprocal crosses were not evident for the expression of harvest index of the crosses under study. Means and degrees of dominance of F1 and F2 populations suggested partial dominance of high harvest index over low harvest index. The pattern of variation among F2 segregates was quantitative and the distribution was normal. The gene action governing the expression of harvest index was largely additive. Evidence was obtained for non-additive gene action in some crosses. There was complete absence of high parent heterosis for harvest index in the F1's but midparent heterosis was found to be present in all crosses. Estimates of heritability and genetic advance were moderate to high. Usefulness of selecting for harvest index as a measure of yield efficiency particularly in early generations is discussed.
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  • 24
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 25 (1976), S. 73-82 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; Heterodera avenae ; cyst nematode ; resistance breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The progress of a backcross breeding programme to introduce resistance against the cereal cyst nematode into wheat is described. Methods of resistance screening and criteria for selection are detailed and the results discussed with reference to alternative procedures for the introduction of new resistance genes into major breeding programmes.
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  • 25
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; Secale cereale ; rye ; intergeneric cross ; crossability ; pollen grain germination ; pollen tube growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The crossing of common wheat (Triticum aestivum L.) with rye (Secale cereale L.), and especially the action of the crossability genes of wheat, was studied using the readily crossable wheat cv Chinese Spring (genotype kr 1 kr 1 kr 2 kr 2 〉), the poorly crossable wheat cv Hope (genotype Kr 1 Kr 1 Kr 2 Kr 2 ), as well as the disomic substitution line of chromosome 5B of Hope into Chinese Spring (CS/Hope 5B, genotype Kr 1 Kr 1 kr 2 kr 2 ). By comparing crossability and actual fertilization, the poor crossability with rye of both cv Hope and the CS/Hope 5B substitution line was shown to result from absence of fertilization. Studies of pollen grain germination and pollen tube growth showed that the dominant alleles of the crossability genes manifested themselves through retardation and eventually inhibition of pollen tube growth at the style base and in the ovary wall. In Hope the growth of all pollen tubes was inhibited, whereas in CS/Hope 5B rarely fertilization was achieved. The recessive alleles of the crossability genes do not seem to have an influence on the growth of rye pollen tubes in wheat pistils.
    Type of Medium: Electronic Resource
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  • 26
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; seedling emergence ; coleoptile length ; plant height ; genetic control ; phenotypic correlations ; selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Seedling emergence was closely correlated with coleoptile length and plant height among parents, F2 and F3, populations of crosses involving dwarf wheats Olesen Dwarf (CI 14497), Norin 10 derivative D6301, Tom Thumb derivative D6899, and the standard-height varieties Ramona 50 and Nainari 60. Genetic mechanisms that governed plant height also influenced coleoptile length, but the relative effects of genes showing dominant or epistatic effects appeared to be different. With respect to the two parents involved in each of 15 crosses, mean F2 coleoptile lengths were consistently closer to the low parent value than were corresponding mean F2 plant heights. A slight curvilinear relationship was also found between coleoptile length and plant height of F3 lines. The results suggest that selection of semidwarf wheats with long coleoptiles and improved emergence properties from crosses involving the dwarf wheats of this study would be unlikely.
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  • 27
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 25 (1976), S. 685-691 
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat flour color ; flour pigment content ; variation ; genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Variation in pigment content of the flour of bread wheats (Triticum aestivum L.) was studied in the progenies of F1 and F2 of three crosses and their reciprocals. Reciprocal differences in pigment content were observed in the F1 and F2 means. Low pigment content was found to be partially dominant or over dominant in the crosses studied. There was evidence of substantial mid-parent F1 heterosis in all crosses and betterparent F1 heterosis in three crosses. In the F2, heritability estimates were moderate to high. The F2 frequency distributions were not normal. Estimation of effective factor pairs indicated the presence of one or two major gene pairs involved in the expression of pigment content in the flour. Action of modifiers was also assumed in one cross and its reciprocal. A factorial approach to metrical character suggested that the F2 segregation ratios of low pigment content to high pigment content were 3:1, 15:1, 13:3 and 9:7 for the different crosses. Utilization of the findings in a wheat breeding program is briefly discussed.
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