[Studies of genetic analysis and SSR linked marker location of gene resistance to southern rust in inbred line P25 of maize].

Using P25 (immune inbred line), F349 (susceptible inbred line) and the derived population F1, F2, B1 and B2 as materials, we investigated the heredity the of disease resistance gene to maize southern rust (Puccinia polysora Underw.) through the major-gene and polygene inheritance model. The results indicate that a major resistance gene exists in the inbred line P25 and expresses with additive effect. We didn't find any multi-genes. The inheritabilities of this major resistant gene among F2, B1 and B2 were 81.88%, 38.14% and 55.1%, respectively. We constructed a maize SSR linkage map using P25 x F349 F2:3 population, and located the resistant gene on chromosome 10. The genetic distance between this gene and phi059 marker was 5.8 cM.