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2 9A系江苏沿海地区农科所以珍汕 97B与V2 0B杂交再与珍汕 97A回交转育而成的籼型野败型不育系 ,具有不育性彻底、开花习性好、异交结实率高等特点 ,是江苏育成的第 1个籼型三系不育系。用 2 9A与盐恢 5 5 9配组育成的新组合 2 9优 5 5 9优势明显 ,抗病性较强 ,米质中上。 2 9A与 2 9优 5 5 9均于 2 0 0 3年 1月通过江苏省农作物品种审定。
2 9A Department of Agro-Sciences in Jiangsu Coastal Region Therefore, the indica wild-type CMS lines of Zhenshan 97B and V2 0B and the Zhenshan 97A backcross were backcrossed with complete sterility, good flowering habits and outcrossing High rate of characteristics, Jiangsu is bred into the first three indica CMS lines. With 2 9A and salt recovery 5 59 with a new combination of bred 2 9 gifted 5 5 9 obvious advantages, strong disease resistance, middle and upper quality. 2 9A and 2 9 excellent 5 5 9 were approved in January 2003 in Jiangsu Province, crop varieties.