Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, 200234, China.
J Integr Plant Biol. 2021 May;63(5):828-833. doi: 10.1111/jipb.13075.
The phytohormones ethylene and salicylic acid (SA) have long been known to promote senescence, but their interplay during this process remains elusive. Here we report the synergistic effects of ethylene and SA on promoting leaf senescence in Arabidopsis. EIN3, a key transcription factor of ethylene signaling, physically interacted with the core SA signaling regulator NPR1 in senescing leaves. EIN3 and NPR1 synergistically promoted the expression of the senescence-associated genes ORE1 and SAG29. The senescence phenotype was more delayed for the ein3eil1npr1 triple mutant than ein3eil1 or npr1 with ethylene or/and SA treatment. NPR1-promoted leaf senescence may depend on functional EIN3/EIL1.
植物激素乙烯和水杨酸（SA）长期以来一直被认为能促进衰老，但它们在这一过程中的相互作用仍难以捉摸。在这里，我们报告了乙烯和 SA 协同促进拟南芥叶片衰老的作用。乙烯信号转导的关键转录因子 EIN3 与衰老叶片中 SA 信号转导的核心调节因子 NPR1 发生物理相互作用。EIN3 和 NPR1 协同促进衰老相关基因 ORE1 和 SAG29 的表达。与乙烯和/或 SA 处理的 ein3eil1 或 npr1 相比，ein3eil1npr1 三重突变体的衰老表型延迟更为明显。NPR1 促进叶片衰老可能依赖于功能性 EIN3/EIL1。
