Inheritance and Genetic Mapping of Resistance to Pythium Damping‐Off Caused by Pythium aphanidermatum in ‘Archer’ Soybean

• DOI: 10.2135/cropsci2008.01.0035
• Publication Date: 2008-11-25T02:38:03Z
• Authors: M. Luciana Rosso; John C. Rupe; Pengyin Chen; Leandro A. Mozzoni
• Keywords: Pythium aphanidermatum; Pythium; Phytophthora sojae; Damping off; Oomycete

Pythium damping‐off and root rot of soybean [ Glycine max (L.) Merr.] causes poor stands consequently reduces yields. Resistance to seedling diseases caused by spp. was reported in the cultivar Archer described be associated with Rps1k gene for resistance Phytophthora sojae . To characterize inheritance determine if this is linked , cross × ‘Hutcheson’ (susceptible parent) made F 2:4 lines generated. Parents were screened aphanidermatum using a hypocotyl inoculation technique. Five days after inoculation, plant survival scored. The parents also inoculated race 7 P. assess association gene. Data from fit model single dominant that confers genetic linkage test showed independent Archer. identify genomic location gene, simple sequence repeat (SSR) markers all molecular groups (MLGs). Two SSR markers, Satt510 Satt114 on MLG F, which polymorphic between resistant susceptible bulks, shown resistance. named Rpa1 located 10.6 cM 26.6 Satt114.