Plants exposed to the combination of drought and pathogen infections are in a unique state, different from that of plants exposed to each stress alone. Plants undergo major hormonal changes during drought and/or pathogen infection, highlighting the importance of hormones as crucial mediators of plant stress responses. Evidence from individual stress studies has shown that drought and pathogen infection have both different and overlapping impacts on hormone metabolism and hormone-associated signal transduction pathways. Thus, under the combination of drought and pathogen infection, a reprograming of hormone levels and related signaling networks is inevitable. This process delivers data from plants exposed to individual stressors inadequate for predicting how hormone levels and related signaling networks will change in plants exposed to a combination of stressors. Furthermore, the yield of crop plants, determined by their capacity for stress acclimatization and resistance to pathogen infection, will be underpinned by interactions among the hormone pathways. Although many studies have been conducted to understand the molecular mechanisms associated with plant responses to combinations of stressors, the interactions that occur among hormones are far from being well-understood. We provide here an overview and evaluation of various reports on crosstalk or overlapping hormonal responses from individual stress studies and how the combination of drought and pathogen infection modulates hormone levels and their associated signaling pathways in plant responses to these combined stresses. We also give a brief overview of the importance of overlapping plant responses for the production of crop plants resistant to individual and combined stressors under natural environmental conditions.

中文翻译：

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植物激素调节干旱与病原体感染以及个体干旱和病原体感染之间的收敛和发散反应。

暴露于干旱和病原体感染的组合的植物处于独特的状态，不同于单独暴露于每种胁迫下的植物。植物在干旱和/或病原体感染期间会发生重大的荷尔蒙变化，突显了激素作为植物胁迫反应的关键介质的重要性。个别压力研究的证据表明，干旱和病原体感染对激素代谢和激素相关信号转导途径的影响不同且重叠。因此，在干旱和病原体感染的结合下，激素水平和相关信号网络的重新编程是不可避免的。此过程无法从暴露于单个胁迫物的植物中获得数据，不足以预测暴露于多种胁迫物的植物中激素水平和相关信号网络的变化。此外，由激素适应环境和抵抗病原体感染的能力决定的农作物产量将由激素途径之间的相互作用所支撑。尽管已经进行了许多研究来了解与植物对应激源组合的反应相关的分子机制，但激素之间的相互作用远未得到很好的理解。我们在此提供了对来自单个胁迫研究的串扰或重叠激素响应的各种报告的概述和评估，以及干旱和病原体感染的组合如何调节植物对这些组合胁迫的响应中的激素水平及其相关信号传导途径。我们还简要概述了重叠的植物应答对于在自然环境条件下对个体和组合胁迫产生抗性的农作物生产的重要性。