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拟南芥茉莉酸途径调节植物对根结线虫的防御反应

DOI: 10.7668/hbnxb.2014.03.042, PP. 234-237

Keywords: 拟南芥,茉莉酸,信号通路,根结线虫,突变体,先天免疫

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Abstract:

对拟南芥根中的茉莉酸(Jasmonicacid,JA)生物合成和信号转导途径及JA对根结线虫发病机制所起的作用进行了研究。研究发现根结线虫的侵染显著诱导拟南芥根中JA和JA-异亮氨酸共轭物(JA-Ile)的合成,分别为AOS1、OPR3和JAR1基因调控。根结线虫在JA缺失突变体和JA-Ile缺失突变体(aos1、opr3、jar1)根中的生殖活性明显低于野生型,但是在缺失JA信号转导核心基因的突变体coi1和jin1的根中同野生型没有显著区别。使用外源JA-Ile可以使根结线虫在jar1根中的生殖能力恢复到在野生型根中的水平。这些结果证明,拟南芥根中JA的合成途径为根结线虫侵染所必需。

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