高柱头外露率中粳不育系春江99A的选育和利用

春江99A是中国水稻研究所利用滇型粳稻不育系春江16A为母本，以粳稻保持系春江99B（春江19B×春江099）作父本杂交，经连续多代选择回交和育性鉴定，转育成的中粳不育系，2014年9月通过浙江省农作物品种审定委员会组织的不育系鉴定。春江99A育性稳定，柱头外露率高，花时较早，异交结实率高，株型好，叶色浅绿，配合力好。利用春江99A配制的籼粳亚种间杂交稻组合表现出杂种优势强，叶色较淡，抗倒性好，全生育期短，后期转色好等特点。

Breeding and Utilization of Late Medium Japonica CMS Line Chunjiang 99A with High Stigma Exsertion Rate

Chunjiang 99A is a late medium Japonica CMS line, developed through crossing Chunjiang 99B(Chunjiang 19B×Chunjiang 099) to Chunjiang 16A and successively backcrossing with Chunjiang 99B as recurrent parent, It was registered and released by Zhe-jiang Provincial Crop Variety Appraisal Committee in 2014. Its percentage of sterile plants was 100%, and its pollen sterility was 99.99%. It had the characteristics of high stigma exsertion rate, early flowering, high outcrossing rate, good plant type, pale green leaf and good combining ability. Its F1 hybrids especially for Japonica-Indica cross hybrids showed dominant heterosis, light leaf color, strong lodging resistance, short whole growing period and good color change in mature stage.