Mejoramiento por la resistencia al virus del mosaico dorado del frijol (BGMV) en poblaciones inter-raciales de Phaseolus vulgaris.
1994
Morales F.J. | Singh S.P.
Eighty-three F2-derived F8 recombinant inbred lines (RILs) randomly selected from a population (TY 8419) of two common bean genotypes (Pinto UI 114 x ICA Pijao), the two parents, and a control cultivar (Topcrop) were screened for their reaction to bean golden mosaic virus (BGMV) under glasshouse conditions. A randomized complete block design with two replications was used. Data were recorded for virus incidence, foliar yellowing, number of pods and seeds, and yield. Significant (P less than 0.05) differences among the 83 RILs were recorded for all traits. Of these RILs, 11 lines did not develop any symptoms, 24 lines had a mean virus incidence of 8 percent, 28 lines had a virus incidence of 26.6 percent and developed intermediate mosaic symptoms, and 20 lines were more susceptible (more than 50 percent infection and severe yellowing) than either of the parents, which had 25 percent to 38 percent infection and moderate symptoms. Heritability for virus incidence was 0.54 plus or minus 0.01, for foliar yellowing 0.36 plus or minus 0.13, for pods plant(-1) 0.69 plus or minus 0.01, for seeds plant(-1) 0.54 plus or minus 0.09, and for yield plant(-1) 0.49 plus or minus 0.01. Gains from selection (at 20 percent selection pressure) for these traits were 49.5 percent, 31.6 percent, 24 percent, 0 percent, and 20 percent, respectively, over the mean value of all RILs. Correlation coefficients between virus incidence and foliar yellowing and among yield and its components were positive. Virus incidence and foliar yellowing showed negative associations with yield and its components.
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