Southern corn rust (SCR) is a destructive disease in maize. The inbred line Qi319 is highly resistant to southern corn rust. The inheritance of resistance to southern rust in Qi319 was investigated. Five F1 hybrids were derived from Qi319 crossed with five susceptible inbred lines respectively. The F2 generations were produced by F1 self-pollinated and BC1 F1 generations were abtained by backcrossing F1 with the susceptible parents. Inoculation of the P1, P2, F1 s and 10 individuals of F2, BC1 F1 were completed with the southern corn rust pathogen and showed that all of the 10 F1 s were resistant, the all 5 F2 populations segregated in a ratio of 3R:1S, and all of the 5 BC1 F1 populations segregated in a ratio of 1R:1S. Therefore, it is considered that Qi319 carries one dominant gene for resistance to southern corn rust.
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