作物学报 ›› 2015, Vol. 41 ›› Issue (01): 31-41.doi: 10.3724/SP.J.1006.2015.00031
李文,万千,刘风珍*,张昆,张秀荣,厉广辉,万勇善
LI Wen,WAN Qian,LIU Feng-Zhen*,ZHANG Kun,ZHANG Xiu-Rong,LI Guang-Hui,WAN Yong-Shan
摘要:
NAC转录因子在植物应答非生物胁迫中起重要作用。利用生物信息学分析推测花生栽培种转录因子基因AhNAC4 (登录号为HM776131.1)属于抗旱相关转录因子基因,对比栽培品种山花11 AhNAC4的2条cDNA序列(ShrNAC4-a和ShrNAC4-b)及其相应的DNA序列(ShNAC4-a和ShNAC4-b)表明,AhNAC4全长为1244 bp,编码区长度为1050 bp,含有2个内含子,分别位于182~279 bp和547~642 bp处,编码蛋白包含349个氨基酸。从抗旱性不同的32个栽培品种分离得到4类AhNAC4,分别命名为AhNAC4-a1、AhNAC4-a2、AhNAC4-b1和AhNAC4-b2,缩写为a1、a2、b1和b2。a1和a2为等位基因,二者在717 bp处存在1个碱基差异,引起第174位氨基酸的改变,b1和b2为等位基因,二者存在14个SNP位点,其中717 bp和924 bp处碱基的差异引起第174位和244位氨基酸的改变。供试品种中基因型为a1a1b1b1、a1a1b2b2、a2a2b1b1、a2a2b2b2的品种数分别为10、5、15和2。从19个野生种中分离得到11类NAC4的DNA序列(Aw1NAC4-Aw11NAC4),Aw1NAC4与栽培种b1、b2的核苷酸序列同源性最高,Aw2NAC4与栽培种a1、a2核苷酸序列同源性最高。推测栽培种a1基因编码蛋白对花生抵御干旱起关键作用,a1和b1基因编码蛋白的功能与野生种更接近。
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