Abstract
Interracial hybrids of metalaxyl-resistant, fluorophenylalanine-sertsitive (MEX r FPA s ) and metalaxyl-sensitive, fluorophenylalanine-resistant (MEX r FPA s ) parents of Phytophihora sojae and 101 F 2 progeny from one hybrid were evaluated in vitro for inhibitor sensitivity. Genetic evidence confirmed that a slow-growing single-oospore culture selected on a double-inhibitor germination medium from a MEX r FPA s race 1 × MEX r FPA s race 3 cross was indeed a sexual hybrid. Analysis of F 2 progeny indicated that a single gene ( Mex ) governing MEX-resistance was incompletely dominant whereas a gene ( Fpa ) for FPA-resistance was fully dominant. Mex and Fpa genes and race 1 and race 3 virulence traits were inherited independently. These data confirm the usefulness of selectable phenotypic markers for studying the genetics of Phytophthora through the sexual cycle.
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