Lixiahe Agricultural Research Institute of Jiangsu Province used the method of molecular marker-assisted selection to polymerize the blast-resistant genes of Pi54 and Pid2 and the fragrance gene offgr into Yangxian 7B,then testcrossed Yangxian 7B with Zhenshan 97A,and successfully developed the aromatic CMS line Yangxian 7A after successive backcrosses.The sterile line showed strong combining ability and moderate resistance to rice blast,and was technically identified by Jiangsu Provincial Crop Variety Appraisal Committee in August 2017.The hybrid combinations Yangxianyou 713 and Yangxianyou 719,derived from Yangxian 7A,were registered and released to commercial production in Guangxi in 2019 and 2020,respectively.The breeding process,main characteristics and key technical points of its multiplication of Yangxian 7A were introduced.
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