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  • genotypic and environmental correlations  (2)
  • Domestication  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Genetic changes under domestication in Vicia faba (1986)
    Springer
    Theoretical and applied genetics 72 (1986), S. 364-372 
    Details
    ISSN: 1432-2242
    Keywords: Inheritance ; Evolution ; Vicia faba ; Domestication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The components of variation within each one of two sets of landraces and/or cultivars of Vicia faba, respectively constituted of primitive and advanced morphological types, were studied by means of two sets of 8 × 8 diallel crosses with two repetitions. The results show that primitive and modern forms differ from each other in both the intensity and the kind of selective pressures acting on them, mainly on those characters more modified through the domestication process: i.e., seed morphology and the number of flowers per node. Because of the paramount importance of the additive component in the primitive forms, it is suggested that the most important type of selection on them is the stabilizing one. On the contrary, in the most advanced forms the selection is directional and disruptive : directional towards greater yields, and disruptive separating two morphological types, ‘major’ and ‘equina’. The plant response to these different selective pressures has been to modify the genetic control of different characters: thus the primitive forms generally show only additivity while the most advanced forms show additivity as well as directional and asymmetrical dominance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00288574
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  • 2
    Electronic Resource
    Electronic Resource
    Variation in Cicer arietinum L. (1978)
    Springer
    Euphytica 27 (1978), S. 465-485 
    Details
    ISSN: 1573-5060
    Keywords: Cicer arietinum ; chickpea ; biosystematics ; intraspecific variation ; crop evolution ; phenotypic ; genotypic and environmental correlations ; principal component analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A collection of populations and cultivars of Cicer arietinum L. were studied to obtain phenotypic, genotypic and environmental correlation coefficients, and broad sense heritabilities. Principal Component Analyses were performed on phenotypic, genotypic and environmental matrices. Data and phase obtained on a pure morphological basis, as well as on quantitative genetic studies and geographical distribution support the existence of two complexes within the cultivated chickpea, macrosperma and microsperma. These taxa differ in a cluster of complex characters associated with seed. pod and leaf morphology, and they differ in distribution. There is no taxonomic basis to treat these as subspecies. We propose to include C. reticulatum Lad., the wild chickpea, as a subspecies of C. arietinum, with the cultivated kinds recognized as subspecies arietinum. Race macrosperma was derived from race microsperma through selection during relatively recent times of the evolutionary history of the chickpea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00043173
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  • 3
    Electronic Resource
    Electronic Resource
    Phenotypic, genotypic and environmental correlation in tomato (Lycopersicon esculentum) (1982)
    Springer
    Euphytica 31 (1982), S. 151-159 
    Details
    ISSN: 1573-5060
    Keywords: Lycopersicon esculentum ; tomato cultivars ; phenotypic ; genotypic and environmental correlations ; indirect selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028317
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