TaWRKY13-A Serves as a Mediator of Jasmonic Acid-Related Leaf Senescence by Modulating Jasmonic Acid Biosynthesis.

TaWRKY13-A Serves as a Mediator of Jasmonic Acid-Related Leaf Senescence by Modulating Jasmonic Acid Biosynthesis.
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TaWRKY13-A 通过调节茉莉酸生物合成作为茉莉酸相关叶片衰老的调节剂

DOI:
10.3389/fpls.2021.717233
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发表时间:
2021
影响因子:
5.6
通讯作者:
Zhou C
Zhou C
中科院分区:
生物学2区
文献类型:
--
作者:
Qiao H;Liu Y;Cheng L;Gu X;Yin P;Li K;Zhou S;Wang G;Zhou C

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叶片衰老对于作物产量和品质至关重要。转录调控是将各种衰老相关信号整合到细胞核中的关键步骤。然而,在小麦中,很少有涉及转录事件的衰老调节因子被进行了功能表征。根据我们的 RNA-seq 数据,我们鉴定了一种主要在衰老阶段表达的 WRKY 转录因子 TaWRKY13-A。通过使用病毒诱导的基因沉默(VIGS)方法,我们发现TaWRKY13-A的转录受损,导致小麦叶片衰老延迟表型。此外,TaWRKY13-A的过表达(OE)加速了短柄草和拟南芥在自然生长条件和黑暗条件下叶片衰老的发生。此外,通过生理和分子研究,我们证实TaWRKY13-A通过茉莉酸(JA)途径参与叶片衰老的调节。 JA 生物合成基因(包括 AtLOX6)的表达在 TaWRKY13-A 过表达的拟南芥中发生改变。我们还通过使用电泳迁移率变动分析(EMSA)和荧光素酶报告系统证明TaWRKY13-A可以与AtLOX6和TaLOX6的启动子相互作用。一致地,我们在 TaWRKY13-A 过表达系中检测到比 Col-0 中更高的 JA 水平。此外,我们的数据表明,TaWRKY13-A 在年龄依赖性叶片衰老中与 AtWRKY53 具有部分功能保守性。总的来说,这项研究表明TaWRKY13-A是JA相关叶片衰老的正调节因子,这可能为小麦分子育种提供新线索。
Leaf senescence is crucial for crop yield and quality. Transcriptional regulation is a key step for integrating various senescence-related signals into the nucleus. However, few regulators of senescence implicating transcriptional events have been functionally characterized in wheat. Based on our RNA-seq data, we identified a WRKY transcription factor, TaWRKY13-A, that predominately expresses at senescent stages. By using the virus-induced gene silencing (VIGS) method, we manifested impaired transcription of TaWRKY13-A leading to a delayed leaf senescence phenotype in wheat. Moreover, the overexpression (OE) of TaWRKY13-A accelerated the onset of leaf senescence under both natural growth condition and darkness in Brachypodium distachyon and Arabidopsis thaliana. Furthermore, by physiological and molecular investigations, we verified that TaWRKY13-A participates in the regulation of leaf senescence via jasmonic acid (JA) pathway. The expression of JA biosynthetic genes, including AtLOX6, was altered in TaWRKY13-A-overexpressing Arabidopsis. We also demonstrated that TaWRKY13-A can interact with the promoter of AtLOX6 and TaLOX6 by using the electrophoretic mobility shift assay (EMSA) and luciferase reporter system. Consistently, we detected a higher JA level in TaWRKY13-A-overexpressing lines than that in Col-0. Moreover, our data suggested that TaWRKY13-A is partially functional conserved with AtWRKY53 in age-dependent leaf senescence. Collectively, this study manifests TaWRKY13-A as a positive regulator of JA-related leaf senescence, which could be a new clue for molecular breeding in wheat.
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