作物学报 ›› 2016, Vol. 42 ›› Issue (12): 1787-1797.doi: 10.3724/SP.J.1006.2016.01787
黄锁1,**,胡利芹1,**,徐东北1,2,李微微1,3,徐兆师1,李连城1,周永斌1,2,刁现民1,贾冠清1,马有志1,陈明1,*
HUANGSuo1,**,HULi-Qin1,**,XUDong-Bei1,2,LIWei-Wei1,3,XUZhao-Shi1,LILian-Cheng1,ZHOUYong-Bin1,2,DIAOXian-Min1,JIAGuan-Qing1,MAYou-Zhi1,CHENMing1,*
摘要:
核转录因子Y (nuclear transcription factor Y,NF-Y)类转录因子在植物生长发育和非生物胁迫响应基因表达调控中发挥重要的作用,NF-Y由3种亚基(NF-YA、NF-YB、NF-YC)组成。本研究从抗逆性强的谷子品种龙谷25中克隆1个新的NF-Y类转录因子基因SiNF-YA5。该基因序列为924 bp,编码307个氨基酸,分子量为33.76 kD,等电点为9.19。SiNF-YA5在149~210位氨基酸之间含有CBF保守结构域。亚细胞定位分析表明,SiNF-YA5定位于细胞膜和细胞核。基因功能分析显示,在不同浓度高盐处理下,和野生型拟南芥(WT)相比SiNF-YA5转基因拟南芥种子萌发率更高;苗期SiNF-YA5转基因拟南芥根表面积和植株鲜重显著高于WT,证明过表达SiNF-YA5基因可以显著提高植物耐盐性。基因表达分析结果显示,在SiNF-YA5转基因拟南芥中参与盐胁迫响应的基因NHX1和LEA7的表达量明显高于WT。另一方面,SiNF-YA5转基因拟南芥与WT相比对于ABA的敏感性差异不显著,以上结果证明SiNF-YA5主要通过ABA非依赖途径提高转基因植物对高盐胁迫的耐性。
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