干旱、高盐、低温等逆境胁迫严重制约着小麦的生长发育和产量,因此研究和选育小麦抗逆品种具有重要的意义。
对生长10 d 左右的小麦幼苗进行干旱、高盐、低温、ABA 和白粉病处理后,取小麦幼叶提取总RNA。然后对应用噬菌体原位杂交技术从小麦旱胁迫cDNA 文库中获得的DREB 类和EREB 类转录因子——DREB4 和EREB1 进行Northern 杂交。杂交结果表明,干旱处理下,DREB4 在5 h 开始表达,10 h表达量最大;高盐胁迫下,DREB4 在2 h 开始被诱导,10 h 表达水平最高。EREB1 在干旱和高盐处理下都是在2 h 开始表达,随处理时间的增加表达量逐渐增大。DREB4 和EREB1 都不受ABA 和低温的诱导。EREB1 受白粉病的诱导,在24 h 开始被诱导表达,48 h 表达量最高;但DREB4 不受白粉病的诱导。
应用农杆菌转化法将DREB4 和EREB1 转入了拟南芥,对获得的拟南芥转基因植株进行了抗旱、抗寒和耐盐性分析。结果表明DREB4 转基因植株在干旱、低温和高盐胁迫下比对照的存活率分别提高了90%、55%和40%;EREB1 转...
【英文摘要】
Drought, high salt, cold are common abiotic stress conditions that adversely affect wheat growth andproduction. So, it has important meaning to research and breed wheat which could decrease the hurt ofabiotic stress.
The wheat seedings were treated by drought, cold, salt, ABA and powdery mildew respectively, thenthe total RNA were separately isolated from these wheat seedings leaves. The transcriptionfactors--DREB4 and EREB1 were obtained from the cDNA library of drought-treated wheat seedings byp...