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Genetics of Antibiosis Resistance to Mexican Bean Beetle in Soybean
Author(s) -
Rufener G. K.,
St. Martin S. K.,
Cooper R. L.,
Hammond R. B.
Publication year - 1989
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1989.0011183x002900030013x
Subject(s) - biology , heritability , antibiosis , diallel cross , genetics , overdominance , botany , horticulture , gene , allele , bacteria , hybrid
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 F 1 , F 2 , and F 3 generations (five F 3 plants per F 2 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 F 1 plants was intermediate to that of their parents. Data from the F 1 of Williams ✕ L76‐0049 and Williams ✕ L76‐0328 indicated a small degree of dominance for resistance. The distributions of F 2 and F 3 phenotypes were continuous and unimodal. Skewness toward susceptibility occurred in Williams ✕ L76‐0328, but symmetry was evident in the other crosses. Heritability estimates (single F 2 plant basis) ranged from 0.33 to 0.48 when calculated from F 3 data, and from 0.11 to 0.22 when calculated from the covariance of F 2 plants and their F 3 progeny. Estimates of heritability derived from F 2 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 F 2 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.