Institute of Plant Sciences, University of Bern, Switzerland.
Curr Opin Plant Biol. 2018 Aug;44:117-121. doi: 10.1016/j.pbi.2018.03.008. Epub 2018 Apr 16.
Volatiles from attacked plants, microbes and herbivores can enhance plant defenses. However, the absence of volatiles rather than their presence has sometimes been associated with enhanced defense, suggesting that volatiles may also act as defense suppressors. Recent work provides a potential mechanistic explanation for these observations by showing that volatile cues can modulate different hormonal pathways, including jasmonate (JA), salicylic acid (SA) and auxin (IAA) signaling. Many of these pathways interact with each other through crosstalk. Thus, volatiles may suppress plant defenses through negative hormonal crosstalk. Hormonal crosstalk may also allow plants to integrate different volatile cues to respond specifically and appropriately to environmental change.
受攻击的植物、微生物和草食动物释放的挥发物可以增强植物的防御能力。然而，挥发物的缺失而不是存在有时与增强的防御有关，这表明挥发物也可能作为防御抑制剂发挥作用。最近的研究通过显示挥发物线索可以调节不同的激素途径，包括茉莉酸（JA）、水杨酸（SA）和生长素（IAA）信号，为这些观察结果提供了一个潜在的机制解释。这些途径中的许多通过串扰相互作用。因此，挥发物可能通过负激素串扰来抑制植物的防御。激素串扰也可能使植物能够整合不同的挥发物线索，以对环境变化做出具体和适当的反应。
