作物学报 ›› 2014, Vol. 40 ›› Issue (12): 2090-2097.doi: 10.3724/SP.J.1006.2014.02090
王兴春1,2,*,王敏1,#,季芝娟3,陈钊4,刘文真3,韩渊怀2,杨长登3,*
WANG Xing-Chun1,2,*,WANG Min1,#,JI Zhi-Juan3,CHEN Zhao4,LIU Wen-Zhen3,HAN Yuan-Huai2,YANG Chang-Deng3,*
摘要:
叶绿体在植物碳水化合物代谢中起着至关重要的作用,然而有关碳水化合物代谢在叶绿体发育过程中的功能却知之甚少。从水稻中克隆了一个Oryza sativa Branching Enzyme 1 (OsBE1)基因,该基因编码一个糖苷水解酶13家族的蛋白。OsBE1与拟南芥AtBE1的一致性为66%,但与水稻典型淀粉分支酶的一致性仅约为40%。该基因的T-DNA插入功能缺失突变体osbe1幼苗白化,且其白化表型不能用外源糖类拯救。osbe1突变体幼苗最终在三叶期死亡。淀粉染色表明,osbe1突变体中淀粉的含量与野生型无明显差异。进一步的研究表明,osbe1突变体叶绿体数目较少,且无明显的基质片层结构。构建了OsBE1基因过量表达载体pCAMBIA1300-35S-OsBE1,并将其转化水稻中花11。获得的108株转基因水稻中,77株表现不同程度的黄化。本文初步揭示了碳水化合物代谢调控叶绿体发育的机制,并为深入研究糖苷水解酶BE1的功能奠定了基础。
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