利用水稻籼粳亚种间组合越光与桂朝2号构建的重组自交系群体,在3种环境下对水稻穗顶部小穗退化性状行了数量性状基因座(QTL)分析。重组自交系群体中穗顶部小穗退化性状的表型均呈连续分布,表现为数量性状遗传,并出现了超亲分离。在RIL群体中共检测到6个QTL,分别位于水稻第1、2、3、5、6和7染色体上,贡献率为4.49%~9.74%。其中,在两地都分别检测到的qASA2位于第2染色体上RM3355-RM263区间;位于第1染色体标记区间RM6451—OSR13的qASA1,LOD值达3.27,其增效等位基因来自桂朝2号。
Quantitative trait loci (QTL) analysis on abortion of apical spikelet was conducted by using recombinant inbred lines (RILs) derived from a cross between indica variety Guichao 2 and Koshihikari under three environments. The abortion trait of apical spikelets in the recombinant inbred lines demonstrated a continuous distribution together with transgressive segrega tions. SixQTLs were mapped on the chromosomes 1,2,3,5,6 and7 in RIL populations, explaining 4.49%-9.74% phcno-typic variations. Among these QTLs, qASA2 was detected at the interval flanked by the markers RM3355 and RM263 on chromosome 2 under different environments, qASA1 was mapped between the markers RM6451 and OSR13 on chromosome 1 with its positive alleles from Guichao 2.