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中优5240是四川省农业科学院水稻高粱研究所利用中国水稻研究所育成的不育系中9A与自育恢复系泸恢5240配组育成的中籼迟熟杂交稻新组合,于2010年通过了重庆市农作物品种审定委员会审定。
Zhongyou 5240 is a new combination of indica late maturing hybrid rice developed by Sichuan Institute of Rice and Sorghum Research Institute of Sichuan Academy of Agricultural Sciences using sterile CMS line 9A and self-restoring line Luhui 5240 from China National Rice Research Institute and adopted in 2010 Chongqing Crop Variety Approval Committee.