Reference Report for IND89041956
| Title: | Genetics of antibiosis resistance to Mexican bean beetle in soybean. |
| Authors: | Rufener, G.K. II, St. Martin, S.K., Cooper, R.L., Hammond, R.B. |
| Source: | Crop Sci. 1989, 29(3):618-622 |
| Abstract: | A larval antibiosis screening technique was applied to three soybean [Glycine max (L.) Merr.] populations to determine the inheritance of resistance to Mexican bean beetle [Epilachna varivestis (Mulsant)]. The F1, F2, and F3 generations (five F3 plants per F2 plant) of crosses between 'Williams' (susceptible) and L76-0049, L78-608, and L76-0328 (resistant) were screened along with the parents. Mean weight of surviving larvae after 10 d of feeding on detached leaves was used as the measure of antibiosis. The resistance of F1 plants was intermediate to that of their parents. Data from the F1 of Williams X L76-0049 and Williams X L76-0328 indicated a small degree of dominance for resistance. The distributions of F2 and F3 phenotypes were continuous and unimodal. Skewness toward susceptibility occurred in Williams X L76-0328, but symmetry was evident in the other crosses. Heritability estimates (single F2 plant basis) ranged from 0.33 to 0.48 when calculated from F3 data, and from 0.11 to 0.22 when calculated from the covariance of F2 plants and their F3 progeny. Estimates of heritability derived from F2 and parental data were larger but had large standard errors. Gene number estimates by the method of moments, and frequency of recovery of parental phenotypes suggested that the number of segregating resistance loci was small. Provided selection was no more intense than 2.5%, expected genetic gain from selection among individual F2 plants was greater if a large number of plants were screened with a single determination per plant than if one-half or one-third that number were screened with two or three determinations per plant, respectively |
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