作物学报 ›› 2020, Vol. 46 ›› Issue (6): 809-818.doi: 10.3724/SP.J.1006.2020.91067
• 作物遗传育种·种质资源·分子遗传学 • 下一篇
HAN Le,DU Ping-Ping,XIAO Kai()
摘要:
脱落酸(ABA)受体PYR/PYL/RCAR通过与渗透胁迫诱导的ABA结合, 参与植株体内ABA介导的信号转导过程, 在调控植株干旱逆境抵御过程中具有重要的生物学功能。本文研究了鉴定的1个干旱响应的PYR家族成员TaPYR1的分子特征、应答干旱表达模式及其介导植株抵御干旱逆境的功能。结果表明, TaPYR1与植物种属中部分PYR基因在氨基酸序列水平上高度同源, 编码蛋白含有PYR家族成员保守结构域, 翻译蛋白经内质网分选后定位于细胞质膜。TaPYR1基因在小麦根、叶中均呈明显的干旱诱导表达模式, 在干旱胁迫48 h表达量达到峰值。与野生型对照(WT)相比, 超表达TaPYR1烟草转化株系, 干旱处理下植株长势增强, 干鲜重增加。干旱处理下, 转化株系较对照的光合能力增强, 细胞保护酶活性提高, 渗透调节物质脯氨酸和可溶性糖含量增加。研究表明, TaPYR1通过在转录水平上应答干旱逆境, 改善干旱胁迫下的植株相关生理过程, 在增强植株抵御干旱逆境能力中发挥重要作用。
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