Abstract
Southern corn rust, caused by Puccinia polysora Underw., has destructive potential on the susceptible host. In this study, the resistance inheritance was investigated in an F 2 and its F 2:3 populations derived from a cross from two inbred lines W2D (resistant) and W222 (susceptible). The 3:1 ratio of resistant to susceptible plants indicated that the resistance is controlled by one dominant gene (named as RppD). The gene RppD was located by means of the F 2 population. Total of 11 markers, including five SSR markers, five sequence-tagged site markers and one cleaved-amplified polymorphic sequence (CAPS) marker, were identified to narrow the gene RppD down to a smaller interval. The closest markers flanking RppD were SSR marker umc1291 and CAPS marker CAPS858, with genetic distances of 2.9 and 0.8 cM, respectively. Moreover, RppD might be a novel Rpp resistance gene or haplotype differing from RppQ and RppP25 according to an allelism test among the three crosses W2D × Qi319, W2D × P25 and Qi319 × P25. As a result, RppD haplotype might be helpful to maize germplasm enhancement and disease-resistant breeding.
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