Designer research lines for bean physiology
1994
White, Jeffrey W. | Beebe, Stephen | Montes R, Consuelo
To increase the efficiency and utility of physiological studies intended to guide bean breeding, genetic materials should be selected with the same care that researchers use in selecting techniques or instruments. Mutant, near-isogenic, recombinant inbred, and genetically engineered lines permit much greater precision in examining effects of genes affecting physiological traits than do sets of conventional lines or cultivars, where associations among traits many not reflect causal mechanisms. It is proposed that physiologists and geneticists collaborate closely in the development of "designer lines" for research. Although only a limited number of genes of physiological interest are known in bean, the prospect of being able to identify many more genes in the future heightens the need to learn how make more efficient use of designer research lines. At CIAT, six sets of near isogenic lines are available or are being developed for traits including stem type, photoperiod response, and non-nodulation. Similarly, six sets of recombinant inbred lines are being developed for seed size, maturity, growth habit, and seed yield under water deficit. Our limited admittedly experience suggests that crosses should be carefully chosen to assure a broad genetic base. Several additional recommendations are offered for consideration of the BARN.
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