Identification of QTL for ratooning ability and grain yield traits in ratoon rice based on SSR marker

An F_(2) population and its corresponding SSR marker linkage map were established and constructed from a cross between two indica rice cultivars, Minghui86 and Jiafuzhan. QTL for ratooning ability and grain yield traits in ratoon rice was identified and analyzed. The results showed that 1 QTL for ratooning ability (panicle per plant), 1 QTL for grain yield and 2 QTL for spikelet per panicle and seed-setting were detected. Their additive effects were from Minghui 86 with same direction effects and increasing effects. QTL conferring ratooning ability (panicle per plant), seed-setting and grain yield of ratoon rice were located in same linked regions of chromosome 7. This explained very well that the very significantly positive correlationship exists between ratooning ability and grain yield or seed-setting.