应用SSR标记定位水稻再生力和再生产量及其构成的QTL

Identification of QTL for Ratooning Ability and Grain Yield Traits in Ra-toon Rice Based on SSR Marker

用两个籼稻品种明恢86和佳辐占为亲本建立的F2群体及相应的SSR分子标记连锁图,对水稻再生力和再生产量及其构成的基因进行了定位。结果定位了影响水稻再生力(再生穗数)的1个QTL,影响再生产量的1个QTL和影响产量构成的2个QTL,各QTL的加性效应均来自亲本明恢86,起增效作用。影响水稻再生穗数、结实率和单株产量的QTL位于同一染色体的相同区段上,且加性效应方向相同,这很好地解释了再生穗数与单株产量、结实率呈极显著正相关的关系。

An F2 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.