Transcription Factor NAC075 Delays Leaf Senescence by Deterring Reactive Oxygen Species Accumulation in Arabidopsis.

Transcription Factor NAC075 Delays Leaf Senescence by Deterring Reactive Oxygen Species Accumulation in Arabidopsis.
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转录因子 NAC075 通过阻止拟南芥中活性氧的积累来延迟叶片衰老

DOI:
10.3389/fpls.2021.634040
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发表时间:
2021
影响因子:
5.6
通讯作者:
Li Z
Li Z
中科院分区:
生物学2区
文献类型:
--
作者:
Kan C;Zhang Y;Wang HL;Shen Y;Xia X;Guo H;Li Z

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叶片衰老是一个高度复杂的遗传过程,是由多层次的调控微调。其中,转录调控在控制叶片衰老的启动和进程中起着至关重要的作用。在这里,我们发现NAC转录因子NAC075作为一种新的叶片衰老的负调控因子。NAC075的功能丧失以年龄依赖性方式促进叶片衰老,而组成型过表达NAC075延迟拟南芥的衰老。转录组分析表明,转录水平的抗氧化酶,如过氧化氢酶(CAT),抗坏血酸过氧化物酶(APX),和超氧化物歧化酶(SOD)显着抑制nac075突变体相比,野生型植物。电泳迁移率变动分析(EMSA)和染色质免疫沉淀(ChIP)分析显示,NAC 075直接结合过氧化氢酶2(CAT 2)的启动子。此外,遗传分析表明,CAT 2的过表达抑制活性氧(ROS)的过度产生和nac075突变体的早衰表型,这表明CAT 2的作用下游的NAC 075通过抑制活性氧积累延缓叶片衰老。总的来说,我们的研究结果提供了一个新的调控模块,涉及NAC075-CAT2-ROS在控制拟南芥叶片衰老。
Leaf senescence is a highly complex genetic process that is finely tuned by multiple layers of regulation. Among them, transcriptional regulation plays a critical role in controlling the initiation and progression of leaf senescence. Here, we found that the NAC transcription factor NAC075 functions as a novel negative regulator of leaf senescence. Loss of function of NAC075 promotes leaf senescence in an age-dependent manner, whereas constitutive overexpression of NAC075 delays senescence in Arabidopsis. Transcriptome analysis revealed that transcript levels of antioxidant enzymes such as catalase (CAT), ascorbate peroxidase (APX), and superoxide dismutase (SOD) are significantly suppressed in nac075 mutants compared with wild-type plants. Electrophoretic mobility shift assay (EMSA) and chromatin immunoprecipitation (ChIP) analyses revealed that NAC075 directly binds the promoter of catalase 2 (CAT2). Moreover, genetic analysis showed that overexpression of CAT2 suppresses the overproduction of reactive oxygen species (ROS) and the early senescence phenotypes of nac075 mutants, suggesting that CAT2 acts downstream of NAC075 to delay leaf senescence by repressing ROS accumulation. Collectively, our findings provide a new regulatory module involving NAC075-CAT2-ROS in controlling leaf senescence in Arabidopsis.
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