Reference Report for SoyBase10189543756
| Title: | Genetic study of resistance to the Mexican bean beetle in soybean lines. |
| Authors: | Mebrahtu, T., Kenworthy, W.J., Elden, T.C. |
| Source: | J. Genet. Breeding 1990, 44(1):7-12 |
| Abstract: | The genetic study of resistance to Mexican bean beetle (MBB) [Epilachna varivestis (Mulsant)] foliar feeding in soybean, [Glycine max L. (Merr.)], was evaluated using the F3 progeny from the cross of a moderately resistant line MBB 80-115, and the commercially adapted susceptible cultivar ware. PI 171451 was the original source of MBB resistance. Parents and progeny were evaluated in replicated hill plots grown in field cages at Queenstown, Maryland. Genetic variability for resistance found in this study varied from moderate (F3 progenies rating of a 21 to 40%) to high resistance (F3 progenies given a rating of 0 to 20%). The mean leaf damage rating of the F3 progenies was not significantly different from the mid-parent value, suggesting that the genetic variance for resistance is an expression of additive genetic variance. Broad sense heritability and genetic advance based on 10% selection differential of MBB resistance for the F3 progenies were estimated to be 43% and 15% respectively. Genotypic and phenotypic correlations between leaf damage and each of the following characters, maturity, lodging, and seed size, were all significant and negative. A positive genotypic correlation was observed between leaf damage and height. The MBB resistant lines were later maturing, lodging susceptible, large seeded, and short in height. |
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