水稻光温敏不育系19XS的选育及其特性分析OA

Photo-thermo-sensitive genic male sterile(P/TGMS)lines are precious resources for hybrid rice breeding.Using the newly discovered rice P/TGMS line 19XS as material,its breeding process,agronomic traits,fertility conversion characteristics,hybrid progeny fertility,and genotype were analyzed.The results showed that in Wuhan area(sown in early May),19XS maintained a stable sterile state for more than 45 days from heading in early August to late September;a small amount of fertility conversion began to occur after October 3.In Hainan area(sown in late November,heading in early March),19XS generally appeared fertile,exhibiting photo-thermo-sensitive fertility conversion characteristics.Genetic analysis indicated that 19XS is a new recessive genic male sterile line,and its sterility is not interfered with by the genetic background.The hybrid progeny of 19XS and Xiang 78S(19XS/Xiang 78S)exhibited excellent agronomic traits,including compact plant type,large panicles with numerous grains,and high seed setting rate.Gene chip detection results showed that both 19XS and 19XS/Xiang 78S contain the thermo-sensitive male sterile gene TMS5.These findings provide a new material basis for hybrid rice breeding.