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  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of aluminium tolerance in a spring rye collection by hydroponic screening (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 121 (2002), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Aluminium (A1) tolerance of 63 rye accessions from a world spring rye collection was evaluated using the haematoxylin method and the root growth method. The haematoxylin method is based on the ability of A1-tolerant seedlings to continue root growth following a short pulse treatment with a high Al concentration, while the root growth method uses the root growth and root tolerance index to judge A1 tolerance. Significantly higher levels of A1 tolerance were found in rye than in the A1-tolerant bread wheat cultivar ‘Maringa’. Under the assumption that the ability of roots to grow under A1 stress is a combination of root vigour (long roots) and A1 tolerance, a hypothesis allowing for the differentiation of five genotype classes was suggested. This study demonstrated that the haematoxylin method and the root growth parameter identify genotypes with long root growth under A1 stress, but failed to detect A1 tolerance in genotypes with poor root vigour. These genotypes can only be identified using the root tolerance index parameter. However, the haematoxylin method is highly suitable for screening large segregating populations derived from improved germplasm that has been preselected for agronomically preferable traits, including plant vigour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2002.00706.x
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  • 2
    Electronic Resource
    Electronic Resource
    Wheat Substitutions in Hexaploid Triticale (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 102 (1989), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Crosses between octoploid and hexaploid triticales have been made m breeding programs for several years, From an analysis of the progeny of such crosses where selections for an octoploid-like phenotype had been made, it was established that 149 out of 150 lines were hexaploid in chromosome number, C-banding and in situ hybridization demonstrated that all but five of the 62 lines analyzed in detail contained visible chromosomes or segments from the D genome. Only four lines had D-genome chromosome replacing rye chromosomes. All of the remaining 53 D-genome substitutions involved the replacing of wheat chromosomes from either the A or B genomes. This establishes the ease with which D-genome genes can be placed into triticale without the loss of rye chromosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1989.tb00323.x
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  • 3
    Electronic Resource
    Electronic Resource
    Parentage Analysis of International Spring Wheat Yield Nurseries 17 to 27 (1998)
    Springer
    Crop science 38 (1998), S. 337-341 
    Details
    ISSN: 1435-0653
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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  • 4
    Electronic Resource
    Electronic Resource
    Inheritance of slow rusting to stem rust in wheat (1978)
    Springer
    Euphytica 27 (1978), S. 95-107 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; Puccinia graminis ; wheat stem rust ; black rust resistance ; inheritance of slow rusting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The inheritance of the slow rusting character was studied on F5 progenies from seven spring wheat cultivars (Triticum aestivum) crossed in all possible combinations without reciprocals. The cultivars and their progenies were evaluated for slow rusting in 1974 and 1975 in epidemics of Puccinia graminis f. sp. tritici, races 15 and 151, and traces of other races. Slow rusting varied significantly among the parents and among the F5 progeny of each cross. Transgressive segregation occurred in each cross, i.e. some progeny rusted more slowly than the parents and some faster. In crosses with both Idaed 59 and Kenya 58 the progeny distributions were skewed towards slow rust development but the distributions in the other crosses were normal. The genetic control of slow rusting was predominantly additive, and narrow sense heritability was approximately 80 percent. The number of segregating genes having an effect on slow rusting was estimated to be 2 to 12 pairs depending on the cross. Correlation between slow rusting and maturity was usually negative but in most crosses the relationship was small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00039123
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  • 5
    Electronic Resource
    Electronic Resource
    Yield and adaptation of hexaploid spring triticale (1990)
    Springer
    Euphytica 47 (1990), S. 57-64 
    Details
    ISSN: 1573-5060
    Keywords: X Triticosecale ; triticale ; cluster analysis ; complete and substituted types ; genotype × site interaction ; ranking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Gains in yield and stability were analysed using grain yield data from the 8th to the 14th International Triticale Yield Nursery (ITYN) and differences in adaptation between complete and substituted triticales (X Triticosecale Wittmack) were examined. A trend of improving yield and adaptation was observed. As highly significant genotype × site interaction each year was not adequately described using regression analysis, yield stability was examined by ranking genotypes within sites and summarizing scores for individual genotypes across sites. Cluster analysis was used to study the relationships among sites and among genotypes. There was little evidence of sites grouping on a geographical basis. Grouping of genotypes showed a tendency for complete and substituted triticales to perform differently, suggesting that diversity for adaptation is maximized by utilizing both types in breeding. Progress for grain yield is compared with more spectacular gains in test weight and reasons for the different rates of improvement are postulated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040364
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  • 6
    Electronic Resource
    Electronic Resource
    Genetic and environmental variability in wheat characteristics reported to be involved in morphological resistance to wheat stem rust (1977)
    Springer
    Euphytica 26 (1977), S. 123-128 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032077
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  • 7
    Electronic Resource
    Electronic Resource
    Evaluating genetic diversity for heat tolerance traits in Mexican wheat landraces (1999)
    Springer
    Genetic resources and crop evolution 46 (1999), S. 37-45 
    Details
    ISSN: 1573-5109
    Keywords: evaluation ; genetic diversity ; heat tolerance ; landraces ; leaf chlorophyll content ; Triticum aestivum L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Large areas of wheat (Triticum aestivum L. Fion et Paol.) are grown under above-optimal temperatures causing significant yield reductions. Adaptation of wheat to such areas through genetic improvement is a way of increasing production in those regions. To identify new and novel sources of heat tolerance, 2,255 Mexican wheat landraces, grown for seed regeneration under semi-controlled conditions in the screenhouse, were evaluated for leaf chlorophyll content (LCC). The landraces were collected from areas with seasonal high temperatures. Based on these initial results, two subgroups of 127 landraces each were selected, one with high LCC values and one with low LCC values. During 1997 the selected subgroups were grown in the screenhouse and in field trials in Cd. Obregon, Mexico. The landraces were evaluated for traits associated with heat tolerance: LCC, canopy temperature depression, and thousand-kernel weight (KWT). The objectives of the study were to identify new sources of heat tolerance and to assess the feasibility of combining basic seed regeneration with characterization for needed traits like heat tolerance. A highly significant correlation was found between LCC in the screenhouse and in field trials, indicating the promise of using a screenhouse for cost effective evaluation of heat tolerance traits. This strategy could be used to identify regions or groups of germplasm that merit more intense screening. Highly significant correlations were also found between LCC and KWT. Three landrace cultivars with superior and consistent LCC values were identified. These accessions are potentially useful sources for improving heat tolerance in cultivated wheat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008684615643
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of Mexican wheat landraces using agronomically useful attributes (2000)
    Springer
    Genetic resources and crop evolution 47 (2000), S. 591-602 
    Details
    ISSN: 1573-5109
    Keywords: characterization ; evaluation ; genetic diversity ; genetic resources ; pattern analysis ; sampling strategy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In 1992, 465 individual spikes of bread wheat were collected from 24 sites in three states of Mexico. They were examined for 15 morphological, agronomic and grain quality attributes as part of the routine regeneration process conducted by the CIMMYT Wheat Genetic Resources Program in unreplicated hill plots in a screen house. A pattern analysis (combined use of classification and ordination methods) of the data provided a good description of the accessions and the collection sites. Since economically useful attributes were used the analysis provided relevant information for both potential users and the germplasm curators. Potential users have a description of the accessions from which to choose relevant breeding material and curators can assess how well the accessions represent the diversity in the collection sites. The analysis would not have been possible if the individual spikes from collection sites were bulked as is the common practice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026550624037
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  • 9
    Electronic Resource
    Electronic Resource
    Evaluation of emmer wheat and other Triticeae for resistance to Russian wheat aphid (1992)
    Springer
    Genetic resources and crop evolution 39 (1992), S. 159-163 
    Details
    ISSN: 1573-5109
    Keywords: Diuraphis noxia ; evaluation ; host-plant resistance ; triticeae ; Triticum dicoccon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary During the winters of 1990/91 and 1991/92, 181 accessions of Triticum dicoccon Schrank from the CIMMYT gene-bank were screened in the field for resistance to Russian wheat aphid, Diuraphis noxia (Kurdjumov). Accessions were sown in hill plots of 10 seeds and artificially infested with D. noxia at the two-leaf growth stage. Hills were visually assessed for damage at tillering, booting and heading. Entries differed significantly in their reaction to D. noxia, and severity of symptoms increased with time. Twenty four of the entries were highly resistant to the aphid. In winter 1991/92, 807 accessions of wild and cultivated wheats (26 species) and synthetic hexaploids were screened similarly for resistance to D. noxia. A large number of A-genome species were resistant, while few D-genome species were identified as resistant. These newly discovered sources of resistance can be used to expand the genetic base of resistance to D. noxia in both bread (T. aestivum L.) and durum wheats (T. turgidum L. convar. durum (Desf.) Mackey).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00051929
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  • 10
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    Plant genetic resources: What can they contribute toward increased crop productivity? (1999)
    National Academy of Sciences
    Details
    Publication Date: 1999-05-25
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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