Jasmonic acid-dependent regulation of seed dormancy following maternal herbivory in Arabidopsis.
Jasmonic acid-dependent regulation of seed dormancy following maternal herbivory in Arabidopsis.
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DOI：
10.1111/nph.14525
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发表时间：
2017-06
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影响因子：
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通讯作者：
P. Singh;A. Dave;F. Vaistij;D. Worrall;G. Holroyd;Jonathan G Wells;F. Kamiński;I. Graham;M. Roberts
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作者：
P. Singh;A. Dave;F. Vaistij;D. Worrall;G. Holroyd;Jonathan G Wells;F. Kamiński;I. Graham;M. Roberts
在许多植物物种中，非生物环境因素如温度和光照的母体经验是众所周知的，以控制种子休眠。母体的生物胁迫改变后代的防御表型，但它是否也影响种子休眠仍有待探讨。我们暴露拟南芥植物草食动物和研究可塑性发芽和防御表型在他们的后代，沿着的作用，植物激素信号在调节母体效应。母株取食导致受胁迫植物种子中茉莉酸-异亮氨酸的积累和休眠的丧失。休眠也减少了工程种子特异性积累的茉莉酸在转基因植物。休眠的损失依赖于一个完整的茉莉酸信号通路，并与增加赤霉素含量和降低脱落酸敏感性在萌发过程中。改变休眠，只观察到在第一代以下草食动物，而防御引发保持至少两代。草食动物产生的茉莉酸依赖减少种子休眠，赤霉素和脱落酸信号的改变介导的。这是一个直接的母体效应，独立于跨代草食动物抗性启动。
Maternal experience of abiotic environmental factors such as temperature and light are well known to control seed dormancy in many plant species. Maternal biotic stress alters offspring defence phenotypes, but whether it also affects seed dormancy remains unexplored. We exposed Arabidopsis thaliana plants to herbivory and investigated plasticity in germination and defence phenotypes in their offspring, along with the roles of phytohormone signalling in regulating maternal effects. Maternal herbivory resulted in the accumulation of jasmonic acid-isoleucine and loss of dormancy in seeds of stressed plants. Dormancy was also reduced by engineering seed-specific accumulation of jasmonic acid in transgenic plants. Loss of dormancy was dependent on an intact jasmonate signalling pathway and was associated with increased gibberellin content and reduced abscisic acid sensitivity during germination. Altered dormancy was only observed in the first generation following herbivory, whereas defence priming was maintained for at least two generations. Herbivory generates a jasmonic acid-dependent reduction in seed dormancy, mediated by alteration of gibberellin and abscisic acid signalling. This is a direct maternal effect, operating independently from transgenerational herbivore resistance priming.