In this paper, the genotype of heading time in Nanjing 11, an indica variety, was analyzed bycrossing with tester varieties, Akihikari ( e1e1 e2e2 e3e3 Se1eSe1e ), Koshihikari ( E1E1E2E2 e3e3 Se1eSe1e ), Nipponbare(E1E1 e2e2 e3e3 Se1Se1 )and Hinohikari(E1E1 E2E2 e3e3 Se1Se1 ), of which the genotypes of headingtime were well known. The results showed genotype of heading time in Nanjing 11 was E1E1 e2e2 E3E3 Se1Se1and also included a recessive inhibitor I-Se1 for photoperiod-sensitivity as well. Meanwhile, the two photoperiod-sensitive genes, E1 and Se1, in Nanjing 11 were also identified by crossing with QTL nearly isogenic lines of Nipponbare, NIL( Hd1 )and NIL( Hd4 )which have complementary effects.
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