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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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  • 2
    Electronic Resource
    Electronic Resource
    Identification of RAPD markers linked to a major rust resistance gene block in common bean (1993)
    Springer
    Theoretical and applied genetics 86 (1993), S. 505-512 
    Details
    ISSN: 1432-2242
    Keywords: Phaseolus vulgaris L. ; Bean rust resistance ; Polymerase chain reaction (PCR) ; DNA markers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rust in bean (Phaseolus vulgaris L.), caused byUromyces appendiculatus (Pers.) Unger var.appendiculatus [ =U. phaseoli (Reben) Wint.], is a major disease problem and production constraint in many parts of the world. The predominant form of genetic control of the pathogen is a series of major genes which necessitate the development of efficient selection strategies. Our objective was focused on the identification of RAPD (random amplified polymorphic DNA) markers linked to a major bean rust resistance gene block enabling marker-based selection and facilitating resistance gene pyramiding into susceptible bean germplasm. Using pooled DNA samples of genotyped individuals from two segregating populations, we identified two RAPD markers linked to the gene block of interest. One such RAPD, OF10970 (generated by a 5′-GGAAGCTTGG-3′ decamer), was found to be closely linked (2.15±1.50 centi Morgans) in coupling with the resistance gene block. The other identified RAPD, OI19460 (generated by a 5′-AATGCGGGAG-3′ decamer), was shown to be more tightly linked (also in coupling) than OF10970 as no recombinants were detected among 97 BC6F2 segregating individuals in the mapping population. Analysis of a collection of resistant and susceptible cultivars and experimental lines, of both Mesoamerican and Andean origin, revealed that: (1) recombination between OF10970 and the gene block has occurred as evidenced by the presence of the DNA fragment in several susceptible genotypes, (2) recombination between OI19460 and the gene block has also occurred indicating that the marker is not located within the gene block itself, and (3) marker-facilitated selection using these RAPD markers, and another previously identified, will enable gene pyramiding in Andean germplasm and certain Mesoamerican bean races in which the resistance gene block does not traditionally exist. Observations of variable recombination among Mesoamerican bean races suggested suppression of recombination between introgressed segments and divergent recurrent backgrounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00838567
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  • 3
    Electronic Resource
    Electronic Resource
    Heterogeneous inbred populations are useful as sources of near-isogenic lines for RAPD marker localization (1994)
    Springer
    Theoretical and applied genetics 88 (1994), S. 337-342 
    Details
    ISSN: 1432-2242
    Keywords: Phaseolus vulgaris L. ; Bean rust resistance ; Polymerase chain reaction (PCR) ; DNA markers ; Near-isogenic lines (NILs)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The development and use of RAPD markers for applications in crop improvement has recently generated considerable interest within the plant breeding community. One potential application of RAPDs is their use for “tagging” simply-inherited (monogenic) pest-resistance genes and enabling more efficient identification and selection of genotypes carrying specific combinations of resistance genes. In this report, we propose and describe the use of heterogeneous inbred populations as sources of near-isogenic lines (NILs) for targeting RAPD markers linked to major pest resistance genes. The development of these NILs for RAPD marker analyses involved a sequence of line and mass selection during successive generations of inbreeding. DNA bulks derived from the NILs were used to identify a RAPD marker (designated OK14620, generated by 5′-CCCGCTACAC-3′ decamer) that was tightly linked (2.23±1.33 centiMorgans) to an important rust [Uromyces appendiculatus (Pers.) Unger var. appendiculatus] resistance gene (Ur-3) in common bean (Phaseolus vulgaris L.). The efficiency of this approach was demonstrated by a low rate of false-positives identified, the tightness of the linkage identified, and the ability to detect polymorphism between genomic regions that are representative of the same gene pool of common bean. This method of deriving NILs should find application by researchers interested in utilizing marker-assisted selection for one or more major pest resistance genes. The identification of OK14620 should help to facilitate continued use of the Ur-3 resistance source and will now enable marker-assisted pyramiding of three different bean rust resistance sources (two previously tagged) to provide effective and stable resistance to this important pathogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223642
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    Paper (German National Licenses)
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