Localization of a quantitative trait locus providing brown stem rot resistance in the soybean cultivar bell.

Crop Science, July, 2005 by Carlson, S.R.; Diers, B.W.; Grau, C.R.; Kurtzweil, N.C.; Patzoldt, M.E.; Stephens, P.A.

Many soybean [Glycine max (L.) Merr.] genotypes that carry resistance to soybean cyst nematode (Heteroderaglycines Ichinohe) (SCN) from plant introduction (PI) 88788 also carry resistance to brown stem rot (BSR) caused by the soilborne fungus Phialophora gregata (Allington & Chamberlain) W. Gams f. sp. sojae Kobayashi, Yamamoto, Negishi, and Ogoshi. The objectives of our research were to map and localize BSR resistance quantitative trait loci (QTL) from Bell, a BSR resistant cultivar with SCN resistance from PI 88788. Initial mapping was done with a population of 93 [F.sub.4]-derived lines developed from a cross between Bell and the SCN and BSR susceptible cultivar, Colfax. Lines were evaluated for BSR resistance in two field environments, a greenhouse, and with genetic markers...

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