Abstract
Crown rust of cultivated oat (Avena sativa L.) caused byPuccinia coronata Corda f. sp.avenae Eriks, causes yield loss, reduction in test weight, and increased lodging. Genetic resistance is the most desirable method to control the disease. ‘TAM O‐301’, a cultivar released by the Texas A&M oat‐breeding program in 1973, has crown rust resistance, subsequently namedPc58. The main objectives of this study were to characterizePc58 in TAM O‐301 using an F6:7 recombinant inbred (RI) population of the ‘Ogle’ × TAM O‐301 cross and to map thePc58 resistance. Six crown rust isolates, avirulent on TAM O‐301 and virulent on Ogle, were used to test the parents and RI population. Genetic analyses of the segregation data to each of the six isolates indicated that the resistance was conditioned by three genes within a 41.0‐cM region. The resistance genes were mapped to linkage groups OT32 and OT33 in the published molecular linkage map of Ogle × TAM O‐301. This research has provided new information on thePc58 resistance gene complex that should facilitate new marker and germplasm development.
Published Version
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