作物学报 ›› 2012, Vol. 38 ›› Issue (05): 814-819.doi: 10.3724/SP.J.1006.2012.00814
杨宙1,2,陈浩1,唐微3,林拥军1*
YANG Zhou1,2,CHEN Hao1,TANG Wei3,LIN Yong-Jun1,*
摘要: 农杆菌介导的转化引起许多体细胞变异, 影响了转基因植物的农艺性状。因此, 转基因作物的培育需要大量的T0代再生植株。在本研究中, 我们将转基因水稻株系与原始品种连续回交, 然后评价其回交后代的表现, 消除体细胞变异, 恢复转基因亲本的农艺性状。回交的供体亲本是3个转基因水稻株系, 分别带有来自于苏云金芽胞杆菌(Bt)的抗虫基因。与原始品种连续回交至BC3F1代, 每代BCnF1单株再自交两代, 同时对各个世代进行抗虫性选择。通过发芽试验获得转基因纯合的BCnF3株系, 在室内抗性试验中, 所有的BCnF3纯合株系都能杀死100%的幼虫。在田间试验中, 这些株系的单株产量明显高于供体亲本, 大部分农艺性状与原品种没有显著的差异。这些结果说明连续回交能够在很大程度上恢复转基因水稻株系的农艺性状, 从而减少转基因育种过程中所需的工作量。
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