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Stigma exsertion rate is a key factor that influences the efficiency of hybrid seed production in rice.To clarify the genetic basis of stigma exsertion rate,a recombinant inbred lines(RIL)population was developed from two superior rice cultivars,Zhongguo Xiangdao(ZX)and Chuanxiang 29B(CX29B),and a total of eleven QTLs for stigma exsertion rate were detected over two years.Two QTLs on chromosome 1 and four QTLs on chromosome 6 formed two QTL cluster regions,qSe1 and qSe6,respectively.