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Genetic Control of Insect Resistance in Soybean Germplasm PI 417061

USDA-ARS, P.O. Box 196, Stoneville, MS 38776
USDA-ARS, P.O. Box 225, Stoneville, MS 38776

^* Corresponding author (kilent{at}ars.usda.gov).

Soybean [Glycine max (L.) Merr.] germplasm lines PI 171451, 227687, and PI 229358 have been reported to be resistant to several insect species. Further studies suggest that each line carries at least one gene for resistance that is different from the other sources. A later introduction, PI 417061, has also been reported to be resistant to several insect species. The genetic relationship of PI 417061 and the other three germplasm lines is unknown. The objective of this study was to determine if the genes for resistance in PI 417061 are different from those in PI 171451, PI 227687, and PI 229358. Parents and F₃ lines from crosses between PI 417061 and the other three resistant lines were rated visually for feeding damage by soybean looper (Pseudoplusia includens Walker) in a greenhouse or field cage. F₃ lines from crosses PI 417061 x ‘Davis’ and PI 417061 x ‘Sharkey’ were also evaluated in a field cage. In previous studies, the cultivars Davis and Sharkey have been very susceptible to foliar feeding insects. In these two crosses, the distribution of F₃ lines for leaf feeding ratings was continuous, but skewed toward the susceptible parent. This suggests the insect resistance of PI 417061 is controlled by multiple genes, similar to that found in the other three germplasm lines. Ratings of F₃ lines from resistant x resistant crosses suggest that genetic control of resistance to soybean looper in PI 417061 is different from that found in PI 171451 and PI 227687, but that the major genes for resistance in PI 417061 are probably the same as those found in PI 229358.

Received for publication July 14, 1997.

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