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  • 1
    Digitale Medien
    Digitale Medien
    Multivariate analysis applied to tomato hybrid production (1984)
    Springer
    Theoretical and applied genetics 69 (1984), S. 39-45 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Lycopersicon esculentum ; Tomato hybrids ; Polycross ; Genetic distance ; Multivariate analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Twenty characters were measured on 60 tomato varieties cultivated in the open-air and in polyethylene plastic-house. Data were analyzed by means of principal components, factorial discriminant methods, Mahalanobis D2 distances and principal coordinate techniques. Factorial discriminant and Mahalanobis D2 distances methods, both of which require collecting data plant by plant, lead to similar conclusions as the principal components method that only requires taking data by plots. Characters that make up the principal components in both environments studied are the same, although the relative importance of each one of them varies within the principal components. By combining information supplied by multivariate analysis with the inheritance mode of characters, crossings among cultivars can be experimented with that will produce heterotic hybrids showing characters within previously established limits.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00262535
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  • 2
    Digitale Medien
    Digitale Medien
    Genotype-environment interaction in tomato (1982)
    Springer
    Theoretical and applied genetics 61 (1982), S. 273-277 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Lycopersicon esculentum ; Genotype environment interaction by regression analysis ; Polyethylene ; Plastic greenhouse ; Polyethylene mulch
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Twelve varieties of tomato of economic importance and their hybrids (including reciprocals) were studied in four environments: inside and outside of greenhouses and with and without plastic mulching. Seven characters were recorded per plant per environment: (1) total yield, (2) fruit weight, (3) locules/fruit, (4) fruits/cluster, (5) earliness in maturity, (6) earliness in harvesting and (7) leaves between clusters. There was an almost general tendency for hybrids to show higher values than the parentals for characters (1), (4) and (7); the opposite was true for (2) and (3), even when the differences were not statistically significant at the 5% level. Environments were always highly significant; the effect of the greenhouse explained most of the variation. Genotype-environment interaction by regression analysis showed that the performance of the hybrids was generally higher than that of the parents for characters (1), (4) and (7). Total yield was higher, in general, in the most protected environments. Locules per fruit was very constant but when interaction did exist, the number of locules was higher in the less protected environments. Hybrids interacted with environments more strongly than parent lines. Earliness was the most environmental dependent characteristic the choice of early harvesting being irrelevant. Some of the hybrids obtained seem promising from a commercial point of view.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00273785
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  • 3
    Digitale Medien
    Digitale Medien
    Phenotypic, genotypic and environmental correlation in tomato (Lycopersicon esculentum) (1982)
    Springer
    Euphytica 31 (1982), S. 151-159 
    Details
    ISSN: 1573-5060
    Schlagwort(e): Lycopersicon esculentum ; tomato cultivars ; phenotypic ; genotypic and environmental correlations ; indirect selection
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Twelve inbred lines of tomato and their 132 hybrids (reciprocals were considered separately) were studied in four environments: glasshouse and open air, with and without plastic cover. Nine characters were recorded and the phenotypic and environmental correlations between them were obtained within environments and for the complete set of data. Characters showing the highest phenotypic correlation with yield were fruits per cluster and earliness in harvesting, but neither of them is useful for indirect selection for yield. To the contrary, leaves between racemes can be used when selecting for fruits per cluster. Environmental correlations were generally low, excepting total yield in fruits per cluster. Broad sense heritabilities were obtained, which were rather high for fruit weight, locules per fruit, fruits per cluster and leaves between clusters. Some cases in which phenotypic correlations were rather constant for the different environments in spite of the great differences recorded for the genotypic correlation coefficients, are explained because of the great weight (i.e., considering heritabilities) of environmental correlations on phenotypic correlations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00028317
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