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  • 1
    Electronic Resource
    Electronic Resource
    Yield stability of determinate and indeterminate dry bean cultivars (1987)
    Springer
    Theoretical and applied genetics 74 (1987), S. 516-521 
    Details
    ISSN: 1432-2242
    Keywords: Phaseolus vulgaris L. ; Gene pool ; Growth habit ; Centers of domestication ; Architype
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Yield stability of determinate and indeterminate dry bean (Phaseolus vulgaris L.) cultivars was compared using regression of genotypic performance on environmental means. Yields of 28 dry bean cultivars differing in plant growth habit and commercial class designation were obtained from 42 Michigan performance nurseries over the 6 year period 1980 to 1985. The determinate type I large-seeded kidney and cranberry bean cultivars had below-average seed yield and large mean square deviations from regression. Lower yielding determinate small-seeded navy cultivars had low deviation mean square values, while higher yielding determinate navy cultivars had correspondingly higher mean square deviations from regression. Although seed yield of cultivars with an indeterminate growth habit was greater than determinate cultivars, prostrate type III indeterminate cultivars had deviation mean square values equivalent to those of large-seeded determinate cultivars. The erect, short vine type II indeterminate cultivars (architypes) had greater than average seed yields and minimum deviations from regression. Compared with other plant types, the architype group showed a greater yield response to more productive environments, with regression coefficient values significantly greater than unity. These results indicate that the type II growth habit offers the breeder the best opportunity of obtaining greater seed yield without incurring loss of yield stability as occurs with the type I and type III growth habits. Since the dry bean cultivars utilized in this study represent two distinct centers of domestication, the regression analysis suggests that cultivars from the predominant genetic center demonstrate more yield stability. A non-significant rank correlation coefficient between the combined and separate analyses for deviation mean square values of large-seeded cultivars implies that commercial dry bean classes should be compared separately based on center of domestication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00289831
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Relationship between genetic distance and heterosis for yield and morphological traits in winter canola (Brassica napus L.) (1995)
    Springer
    Theoretical and applied genetics 91 (1995), S. 118-121 
    Details
    ISSN: 1432-2242
    Keywords: Canola ; Heterosis ; Genetic distance ; Multivariate analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Genetic distance among canola cultivars was estimated through multivariate analysis. Thirty cultivars from various sources were analyzed and clustered based upon five morphological characteristics and yield components-crown diameter, number of branches plant-1, number of pods plant-1, number of seeds pod-1 and yield plant-1 -and placed in three distinct clusters. Two cultivars from each cluster were selected as parents and 15 partial-diallel inter- and intra-cluster crosses were made between the six selected parents and evaluated at two locations in Michigan in 1990/1991. The association between genetic distance and mid-parent heterosis was investigated. The correlation between genetic distance and heterosis was positive and highly significant for seed yield, number of pods plant-1, and number of seeds pod-1. Clustering, based on yield and yield-component traits, demonstrated that inter-cluster heterosis was greater than intra-cluster heterosis in the majority of cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220867
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    Paper (German National Licenses)
    Fulltext
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