Geographical distribution of the DL1 and DL2 genes causing hybrid dwarfism in Phaseolus vulgaris L., their association with seed size, and their significance to breeding
Dwarlism in F1 hybrids has been observed in over 100 crosses of dry beans (Phaseolus vulgaris L.) at the Centro Internacional de Agricultura Tropical (CIAT), Cali, Colombia. In each cross, one parent always had small seeds and the other parent either medium or la ge ones. This apparent incompatibility between the two groups of germplasm was controlled by two complementary, dominant genes: DL1 and DL2. Smallseeded bean lines carried gene DL1 and originated in Brazil, Colombia, Guatemala, and Mexico; medium for large-seeded bean lines carried gene DL2 and were from Bolivia, Brazil, Chile, Colombia, Turkey, The United States, and West Germany. Thes two genes have probably played an important role in the evolution of dry bean forms of different seed sizes by serving as a genetic barrier or isolating mechanism, thus limiting free genetic recombination between the two germplasm groups.
Apparent differences in the adaptiveness and yielding ability of the two groups of bean germplasm, smallys, medium- and large-seeded, and some breeding implications for manipulation of the genes causing F1 hybrid dwarfism were also discovered.
Index wordsPhaseolus vulgaris common bean hybrid dwartism seed size growth habit crippled development sublethal development diallel cross evolution breeding
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- Coyne D. P., 1965. A genetic study of ‘crippled’ morphology resembling virus symptoms in Phaseolus vulgaris L. J. Hered. 56: 162–176.Google Scholar
- Davis D. W. & W. A. Frazier, 1964. The incidence of three abnormalities in F2 progeny of crosses between true bushes and Blue Lake derived bush snap beans. Ann. Rept. Bean Impr. Coop. (New York). 7: 14–16.Google Scholar
- Evans A. M., 1973. Plant architecture and physiological efficiency. In: Potentials of field beans and other food legumes in Latin America. Centro Internacional de Agricultura Tropical, Cali, Colombia, pp. 279–286.Google Scholar
- Nienhuis, J. & Shree P. Singh, in preparation. Diallel analyses for yield, yield components and architectural traits in dry bush beans, Phaseolus vulgaris L.Google Scholar
- Shii C. T., M. C. Mok & D. W. Mok, 1981. Developmental controls of morphological mutants of Phaseolus vulgaris L.: Differential expression of mutant loci in plant organs. Develop. Genet. 2: 279–290.Google Scholar
- Shii C. T., S. R. Temple & D. W. Mok, 1980. Expression of developmental abnormalities in hybrids of Phaseolus vulgaris L.: Interaction between temperature and allelic dosage. J. Hered. 71: 219–222.Google Scholar
- Singh Shree P., 1982. A key for identification of different growth habits of Phaseolus vulgaris L. Ann. Rept. Bean Impr. Coop. (New York). 25: 92–94.Google Scholar
- Van Rheenen H. A., 1979. A sub-lethal combination of two dominant factors in Phaseolus vulgaris L. Ann. Rept. Bean Impr. Coop. (New York). 22: 67–69.Google Scholar
- York D. W. & M. H. Dickson, 1975. Segregation of a semi-lethal or crippled condition from crosses involving P.I. 165435. Ann. Rept. Bean Impr. Coop. (New York). 18: 88–89.Google Scholar