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  • Lycopersicon  (9)
  • Springer  (9)
  • American Physical Society
  • Institute of Physics
  • 1980-1984  (9)
  • 1935-1939
  • 1984  (1)
  • 1981  (5)
  • 1980  (3)
  • 1939
Sammlung
Schlagwörter
Verlag/Herausgeber
  • Springer  (9)
  • American Physical Society
  • Institute of Physics
Erscheinungszeitraum
  • 1980-1984  (9)
  • 1935-1939
Jahr
  • 1984  (1)
  • 1981  (5)
  • 1980  (3)
  • 1939
  • 1983  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Low temperature effect on selective fertilization by pollen mixtures of wild and cultivated tomato species (1981)
    Springer
    Theoretical and applied genetics 59 (1981), S. 235-238 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Low temperature adaptation ; Lycopersicon ; Pollen mixtures ; Selective fertilization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary In vitro pollen germination of cultivated tomato, Lycopersicon esculentum Mill., is inhibited by an ambient temperature of 5°C, more so than pollen from a Peruvian ecotype of Lycopersicon hirsutum Humb. & Bonpl. originating from an altitude of 3200 m. The frequency of L. hirsutum gametes contributing to hybrid zygote formation is more than doubled when controlled fertilizations with pollen mixtures of the two species occurs at 12/6°C as compared to crosses with the same mixtures at 24/19°C. The results suggest that differential selection at the gametophytic level occurs in response to low temperature regimes. To our knowledge this is the first time in higher plants that alteration of an environmental factor has been demonstrated to change selection values of male gametophytes in a fashion predicted by the ecology of the parental sporophytes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00265501
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  • 2
    Digitale Medien
    Digitale Medien
    Comparative analyses of the effect of triacontanol on photosynthesis, photorespiration and growth of tomato (C3-plant) and maize (C4-plant) (1981)
    Springer
    Planta 152 (1981), S. 44-49 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Lycopersicon ; Phetorespiration ; Photosynthesis ; Triacontanol ; Zea
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Tomato (C3-plants) and maize (C4-plants) were grown in a nutrient solution to which triacontanol was added twice a week. After about 4 weeks the triacontanol treatment caused a significant increase in the dry weight of the tomato plants. Leaf area and dry weight measurements of tomato leaves at different stages of development showed that the largest increase in growth was obtained when triacontanol treatment was initiated before bud formation. In maize, no effect of the triacontanol treatment on dry wieght was observed. Photosynthesis was inhibited by 27% in young leaves from triacontanol-treated tomato plants and 39% in the controls, when the oxygen concentration was raised from 2% to 21%. In maize no change in photosynthesis could be observed, neither after altered oxygen concentration nor after triacontanol treatment. The difference in the response of C3- and C4-plants to triacontanol indicates that it regulates processes related to photosynthesis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00384983
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  • 3
    Digitale Medien
    Digitale Medien
    Superoxide dismutase: A possible protective agent against sunscald in tomatoes (lycopersicon esculentum mill.) (1980)
    Springer
    Planta 148 (1980), S. 162-167 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Light (photodynamic damage) ; Lycopersicon ; Photodynamic damage ; Sunscald ; Super-oxide dismutase
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Superoxide dismutase (SOD, EC 1.15.1.1) was concentrated from mature-green tomato fruits by gel chromatography. The enzyme was inhibited by cyanide but not by chloroform-ethanol, and appears to contain zinc and lesser amounts of copper. SOD-activity levels were high in immature green fruits, declined to a minimum in the mature-green and breaker stages known to be most susceptible to sunscald damage, increased again until the fruits were pink, and finally decreased through the red-ripe and overripe stages to the level of the mature-green fruit. When tolerance to sunscald damage was induced in mature-green fruits by controlled temperature treatment and samples of the fruits were challenged at various times during this process with a combined heat-and-light treatment known to cause sunscald, SOD activity was found to be inversely related to the susceptibility of the fruit to sunscald damage. It is suggested that superoxide is involved in sunscald injury to tomatoes and that tolerance is acquired through increases in SOD activity. Possibly SOD acts as a general protective agent against photodynamic damage to green tissues in plants that have become conditioned as the result of normal diurnal temperature fluctuations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00386417
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  • 4
    Digitale Medien
    Digitale Medien
    Effects of O2 stress on tomato alcohol dehydrogenase activity: Description of a second ADH coding gene (1981)
    Springer
    Biochemical genetics 19 (1981), S. 397-409 
    Details
    ISSN: 1573-4927
    Schlagwort(e): Lycopersicon ; anaerobic induction ; Adh-2 ; linkage
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Subjecting tomato seedlings to anaerobic conditions results in expression of a previously undescribed Adh gene, Adh-2. Induction profiles were similar for all tissues, including roots, hypocotyls, cotyledons, and true leaves. In sharp contrast to ADH-1, ADH-2 showed no induction under anaerobic stress. The only time ADH-2 activity was expressed (under noninduced conditions) was during the early stages of embryogenesis. By late embryogenesis, ADH-2 activity approached a zero level, concomitant with a sharp rise in ADH-1 activity, which is found in the cotyledons of quiescent embryo. Despite striking differences in the regulation of these two genes, their homology is demonstrated in the ability of their enzyme subunits to form presumed intergenic heterodimers, which are visible during the transient period of embryogenesis when the polypeptides encoded by both genes are expressed. A multiple point linkage test using isozymic marker genes places the Adh-2 locus on chromosome 6 near Aps-1, whereas Adh-1 resides on chromosome 4.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00504283
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  • 5
    Digitale Medien
    Digitale Medien
    Tight linkage between a nuclear male-sterile locus and an enzyme marker in tomato (1984)
    Springer
    Theoretical and applied genetics 68 (1984), S. 109-113 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Lycopersicon ; Isozymes ; Male sterility ; Linkage ; Plant breeding
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The linkage relationship of a nuclear male sterile locus, ms-10, was tested with two enzyme marker loci known to be on the same chromosome (long arm of chromosome 2). The results indicate the gene order is Est-1 — 18 cM — Prx-2 — 1.5 cM — ms-10. The linkage intensity of ms-10 and Prx-2 (1.5 cM) suggests that Prx-2 might provide a selectable marker for male-sterility. In accordance with this idea, the ms-10 allele was placed in cis with a rare-allele of Prx-2 (Prx-2 1). Selection on the basis of the codominant Prx-2 1 allele should allow for more rapid and efficient transfer of the recessive male sterile allele into an array of genetic backgrounds, thus promoting its use in hybrid seed production.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00252324
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  • 6
    Digitale Medien
    Digitale Medien
    Genetics of esterases in species of Lycopersicon (1980)
    Springer
    Theoretical and applied genetics 56 (1980), S. 209-219 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Lycopersicon ; Gel electrophoresis ; Esterases ; Linkage ; Angiosperm evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Improvements in plant culture and electrophoretic technique permit detection and genetic analysis of seven esterase loci in Lycopersicon esculentum and related species with homosequential chromosomes. At all of these loci except one, each allele codes for a single anodal band, and the electrophoretic variants are inherited in monogenic fashion. For the exceptional Est-4, allozymes are 1–3 banded in various combinations at four positions, and rare recombinants in one cross appeared at a frequency of 0.0005, suggesting the existence of several very tightly linked genes. Est-2 segregated solely for intensity differences in dominant/recessive fashion; Est-3 and Est-4 behave as monomers; the remaining Est-l, 5, 6, and 7 — coding for contiguous bands in the region closest to the origin — are dimeric. The latter group are tightly linked inter se in the proximal portion of 2L (long arm of chromosome 2), the total map distance of the complex being approximately 1.5 cM; Est-2 is situated on 9L between ah and marm; Est-3 on 1L between inv and dgt; Est-4 has not yet been located. Even in the interspecific hybrids, map distances are similar to the standard values for L. esculentum. Tandem duplication is hypothesized for the origin of the Est-l, 5–7 complex, which adds another example to the growing list of linked mimic genes in the tomato genome. In respect to the position of their bands and tight inter se linkage, this series exactly parallels the EA, EB, EC esterase series in Hordeum vulgare — a fact which suggests great antiquity for this block of genes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00295451
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  • 7
    Digitale Medien
    Digitale Medien
    The effect of isozyme selection on metric characters in an interspecific backcross of tomato — basis of an early screening procedure (1981)
    Springer
    Theoretical and applied genetics 60 (1981), S. 291-296 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Isozyme selection ; Backcross ; Zymotype ; Selection technique ; Interspecific breeding ; Lycopersicon ; Solanum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The extent of correlation was estimated between isozyme genotypes and the four widely segregating characters — leaf segment W/L ratio, stigma exsertion, fruit weight, and seed weight — in the first backcross of F1 Lycopersicon esculentum x Solanum pennellii to the former parent. The inbred parents differ in their alleles at the 12 tested isozymic loci, which are known to mark a minimum of eight of the twelve tomato chromosomes. Based on the isozyme data, a mean heterozygosity value, ¯H, was calculated which estimates the proportion of pennillii alleles in each individual. Correlations between mean heterozygosity and observed levels of each quantitative trait were highly significant and positive or negative as expected from the relative parental values. Plants with the lowest mean heterozygosity — i.e., closest to the esculentum zymotype also had mean values closest to those of this parent amongst the whole backcross population for each of the quantitative traits. Bivariate and multiple regression analysis was used to evaluate the ability of isozymes vs diagnostic morphological characters to estimate the portion of recurrent parent genes carried in each backcross individual. The results suggest that isozyme data gives better estimates than single diagnostic morphological characters and approach the level obtained by combinations of three morphological traits. Since electrophoretic determinations are made on small seedlings, selection at that stage can effect great savings of space and effort by greatly deminishing the size of the population needed at maturity. As such, isozyme selection would precede morphological selection but not replace it, thus the predictive value of these biochemical markers as well as diagnostic morphological characters could be obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00263721
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  • 8
    Digitale Medien
    Digitale Medien
    Isozymic gene linkage map of the tomato: Applications in genetics and breeding (1980)
    Springer
    Theoretical and applied genetics 58 (1980), S. 161-170 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Isozymes ; Linkages ; Lycopersicon ; Interspecific transfers ; Trisomic analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary New linkage data are presented for the situation of five previously unlocated isozymic loci of the tomato and closely related species with homosequential chromosomes.Prx-1 lies on chromosome 1, where it is also linked withSkdh-1; Aps-2 is linked withGot-4 on chromosome 8;Tpi-2 has been allocated to chromosome 4; and a linkage has been detected betweenPgi-1 andEst-4, whose respective chromosome has not yet been determined. These and previously published data have been summarized in the form of an isozyme linkage map. Twenty-two loci have thus been mapped on nine of the twelve tomato chromosomes. We discuss some new applications of mapped isozymic genes. In certain types of segregations, isozymic genes are far more efficient than morphological markers in providing linkage information. They greatly expedite the cytogenetic investigation of species hybrids and can be utilized to facilitate backcross transfers of genes from wild to cultivated taxa.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00279708
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  • 9
    Digitale Medien
    Digitale Medien
    Genetic variation inSolanum pennellii: Comparisons with two other sympatric tomato species (1981)
    Springer
    Plant systematics and evolution 139 (1981), S. 11-45 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Solanaceae ; Lycopersicon ; Solanum pennellii ; Allozymes ; electrophoresis ; isozymes ; mating systems ; self-incompatibility
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Genetic variation—primarily in 19 genetic loci of seven enzyme systems—was analyzed in accessions from various parts of the geographic range ofSolanum pennellii, which according to all tested biosystematic criteria behaves like a species ofLycopersicon. In comparison with the largely sympatricL. hirsutum andL. pimpinellifolium, this species exhibits the same trends of reduced allogamy and decreased genetic variation toward the north and south margins of its distribution, though to a much lesser degree; it does not exhibit their trends toward smaller flower size in the same peripheral regions. All three species agree to a considerable extent in the ranking of their tested loci in respect to degree of variablility; however, overall polymorphy is highest inS. pennellii. Except for the appearance of self-compatibility at its southernmost margin,S. pennellii is exclusively and rigidly self-incompatible. Alleles are distributed much more uniformly over the range than in the previously mentioned species, marginal and internal endemic mutants being much less abundant. A marked geographic disagreement is evident in regions of high and low variation. These differences in patterns of genetic variability are reconciled in terms of observed differences in mating systems, probable age of distributions, and adaptive strategies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00983920
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