Evaluating soybean germplasm for brown stem rot resistance.

Reference Report for IND20379078

Title:	Evaluating soybean germplasm for brown stem rot resistance.
Authors:	Nelson, R.L., Nickell, C.D., Orf, J.H., Tachibana, H., Gritton, E.T., Grau, C.R., Kennedy, B.W.
Source:	Plant Dis. 1989, 73(2):110-114
Abstract:	During 1981-84 over 3400 accessions from the USDA Soybean Germplasm Collection in maturity groups 000 to IV were evaluated for resistance to brown stem rot caused by Phialophora gregata. Soyabean lines were evaluated in naturally infested fields at latitudes to which they were adapted. In 1985 and 1986, 13 early-maturity and 25 late-maturity, putatively resistant lines were evaluated in replicated tests in the field and in the greenhouse. Ratings were based on leaf and stem symptoms. No lines were immune. In the early-maturity test, no lines were as resistant as the resistant standards at all 3 locations tested, but several lines were highly resistant at 2 or more locations. In the late-maturity test, lines PI 424.285A, PI 424.353 and PI 424.611A were resistant in all tests, but were not superior to previously identified sources. Many lines had inconsistent responses across environments and reasons for those interactions are discussed

Funded by the USDA-ARS. Developed by the USDA-ARS SoyBase and Legume Clade Database group at the Iowa State University, Ames, IA

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