高柱头外露率中粳不育系春江99A的选育和利用

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

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。

Chunjiang 99A is a late medium Japonica CMS line, developed through crossing Chunjiang 99B （Chunjiang 19BxChunjiang 099） to Chunjiang 16A and successively backcrossing with Chunjiang 99B as recurrent parent, It was registered and released by Zhejiang 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-lndica cross hybrids showed dominant heterosis, light leaf color, strong lodging resistance, short whole growing period and good color change in mature stage.