Abiotic stresses greatly affect the immunity of plants. However, it is unknown whether pathogen infection affects abiotic stress tolerance of host plants. Here, the effect of defense response on cold and heat tolerance of host plants was investigated in Pst DC3000-infected Arabidopsis plants, and it was found that the pathogen-induced defense response could alleviate the injury caused by subsequent cold and heat stress (38°C). Transcriptomic sequencing plus RT-qPCR analyses showed that some abiotic stress genes are up-regulated in transcription by pathogen infection, including cold signaling components ICE1, CBF1, and CBF3, and some heat signaling components HSFs and HSPs. Moreover, the pathogen-induced alleviation of cold and heat injury was lost in NahG transgenic line (SA-deficient), sid2-2 and npr1-1 mutant plants, and pathogen-induced expression of cold and heat tolerance-related genes such as CBFs and HSPs, respectively, was lost or compromised in these plants, indicating that salicylic acid signaling pathway is required for the alleviation of cold and heat injury by pathogen infection. In short, our current work showed that in fighting against pathogens, host plants also enhance their cold and heat tolerance via a salicylic acid-dependent pathway.

中文翻译：

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Pst DC3000感染通过拟南芥中的水杨酸依赖性途径减轻了对寄主植物的随后冻害和热害。

非生物胁迫极大地影响植物的免疫力。但是，病原体感染是否影响宿主植物的非生物胁迫耐受性尚不清楚。在这里，研究了感染Pst DC3000的拟南芥植物中防御反应对寄主植物耐冷热的作用，发现病原体诱导的防御反应可以减轻随后的冷热胁迫（38° C）。转录组测序和RT-qPCR分析表明，病原体感染使一些非生物胁迫基因在转录中上调，包括冷信号成分ICE1，CBF1和CBF3，以及一些热信号成分HSF和HSP。此外，在NahG转基因品系（SA缺失），sid2-2和npr1-1突变植物中，病原体诱导的冷热伤害减轻作用消失了，在这些植物中，CSFs和HSPs等与病原体诱导的冷和热耐受性相关基因的表达分别丢失或受损，这表明水杨酸信号通路是减轻病原体感染所致的冷热损伤所必需的。简而言之，我们目前的工作表明，在对抗病原体方面，寄主植物还可以通过水杨酸依赖性途径增强其耐寒性和耐热性。