作物学报 ›› 2020, Vol. 46 ›› Issue (8): 1217-1224.doi: 10.3724/SP.J.1006.2020.92060
LI Jing-Lan,CHEN Xin-Xin,SHI Cui-Cui,LIU Fang-Hui,SUN Jing,GE Rong-Chao()
摘要:
水稻OsRPK1基因属于富含亮氨酸重复序列的类受体蛋白激酶, 在盐胁迫下其表达量暂时升高后出现明显下降。前期研究表明, OsRPK1基因过表达会造成拟南芥非生物胁迫耐受性明显降低。本研究对OsRPK1基因在水稻中实现过表达和RNA干涉, 进而对OsRPK1的抗逆性功能加以探究。结果表明, OsRPK1基因表达量增加时, 水稻幼苗表现为耐盐性下降; RNA干涉则使水稻幼苗表现为耐盐性增加。盐胁迫后OsRPK1过表达植株脯氨酸含量低于野生型、MDA含量和相对电导率显著高于野生型, 而OsRPK1-RNAi水稻植株的脯氨酸含量显著高于野生型、MDA含量和相对电导率显著低于野生型。因此, OsRPK1基因的表达量对水稻耐盐性具有明显影响, 脯氨酸含量及细胞质膜受破损程度的改变可能是造成转基因水稻耐盐性变化的内在原因。本研究为进一步阐明OsRPK1基因的抗逆作用机制奠定了基础, 对于通过调整该基因表达改良水稻的耐盐性具有重要意义。
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