Ways of Hybrid Seed Production (1)Manual or mechanical emasculation(maize, tomato, tobacco)人工去雄 (2) Use of marker characters( cotton)利用标志性状 (3) Chemical hybridizing agents( wheat)化学杀雄 (4) Using self-incompatibility( crucifers)利用自交不亲和 性 (5)Using male sterility(rice, rape, cotton, sorghum, maie…,)利用雄性不育性▪ Ways of Hybrid Seed Production (1) Manual or mechanical emasculation (maize, tomato, tobacco) 人工去雄 (2) Use of marker characters (cotton) 利用标志性状 (3) Chemical hybridizing agents (wheat) 化学杀雄 (4) Using self-incompatibility (crucifers) 利用自交不亲和 性 (5) Using male sterility (rice, rape, cotton, sorghum, maize …) 利用雄性不育性