JAZ7 negatively regulates dark-induced leaf senescence in<i>Arabidopsis</i>

Yu, Juan; Zhang, Yixiang; Di, Chao; Zhang, Qunlian; Zhang, Kang; Wang, Chunchao; You, Qi; Hong, Yanbin; Dai, Susie Y.; Yuan, Joshua S.; Xu, Wenying; Su, Zhen

doi:10.1093/jxb/erv487

Cited by 113 publications

(85 citation statements)

References 58 publications

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“…Cross-talks between SA/ROS and other hormones are discussed here, and the key components of plant hormone pathways involved in leaf senescence and/or plant immunity are summarized in Table 2 and shown in Figure 2. Positive [105,106] Negative [107] Positive [21,108] Negative [103,109] JAZ7 Protein constitutes JA receptor complex with COI1 AT2G34600 Negative [110] Positive [111] Negative [111] MYC2 A MYC-related transcriptional activator interacted with JAZs AT1G32640 Positive [112] Negative [113] Negative [114,115] A bZIP transcription factor involved in ABA signaling AT2G36270 Positive [118] Non [81] GA DELLAs…”

Section: Cross-talks Between Sa/ros and Other Hormones During Leaf Sementioning

confidence: 99%

Genetic Network between Leaf Senescence and Plant Immunity: Crucial Regulatory Nodes and New Insights

Zhang

Wang

et al. 2020

Plants

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Leaf senescence is an essential physiological process that is accompanied by the remobilization of nutrients from senescent leaves to young leaves or other developing organs. Although leaf senescence is a genetically programmed process, it can be induced by a wide variety of biotic and abiotic factors. Accumulating studies demonstrate that senescence-associated transcription factors (Sen-TFs) play key regulatory roles in controlling the initiation and progression of leaf senescence process. Interestingly, recent functional studies also reveal that a number of Sen-TFs function as positive or negative regulators of plant immunity. Moreover, the plant hormone salicylic acid (SA) and reactive oxygen species (ROS) have been demonstrated to be key signaling molecules in regulating leaf senescence and plant immunity, suggesting that these two processes share similar or common regulatory networks. However, the interactions between leaf senescence and plant immunity did not attract sufficient attention to plant scientists. Here, we review the regulatory roles of SA and ROS in biotic and abiotic stresses, as well as the cross-talks between SA/ROS and other hormones in leaf senescence and plant immunity, summarize the transcriptional controls of Sen-TFs on SA and ROS signal pathways, and analyze the cross-regulation between senescence and immunity through a broad literature survey. In-depth understandings of the cross-regulatory mechanisms between leaf senescence and plant immunity will facilitate the cultivation of high-yield and disease-resistant crops through a molecular breeding strategy.

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Section: Cross-talks Between Sa/ros and Other Hormones During Leaf Sementioning

confidence: 99%

Genetic Network between Leaf Senescence and Plant Immunity: Crucial Regulatory Nodes and New Insights

Zhang

Wang

et al. 2020

Plants

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“…Upon JA binding, the JAZ proteins are destroyed by SKP1-CUL1-F-box protein (SCF) COI1 -mediated 26S proteasome, which releases JAZ-interacting TFs, such as MYC and MYB family members, and other TFs, to drive gene expression and thus change growth responses (Chico et al, 2008;Howe et al, 2018;Pauwels and Goossens, 2011;Wager and Browse, 2012). Hence, changes to JAZ protein stability and/or protein variants affect plant development (Cai et al, 2014;Chini et al, 2007;Chung et al, 2010;Chung and Howe, 2009;Gimenez-Ibanez et al, 2017;Hori et al, 2014;Hu et al, 2016;Huang et al, 2017;Oh et al, 2013;Song et al, 2011;Thines et al, 2007;Thireault et al, 2015;Yang et al, 2012;Yu et al, 2016;Zhai et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

The OsJAZ1 degron modulates jasmonate signaling sensitivity during rice development

et al. 2019

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Jasmonates (JAs) are crucial to the coordination of plant stress responses and development. JA signaling depends on JASMONATE-ZIM DOMAIN (JAZ) proteins that are destroyed by the SCF COI1mediated 26S proteasome when the JAZ co-receptor COI1 binds active JA or the JA-mimicking phytotoxin coronatine (COR). JAZ degradation releases JAZ-interacting transcription factors that can execute stress and growth responses. The JAZ proteins typically contain Jas motifs that undergo conformational changes during JA signal transduction and that are important for the JAZ-COI1 interaction and JAZ protein degradation. However, how alterations in the Jas motif and, in particular, the JAZ degron part of the motif, influence protein stability and plant development have not been well explored. To clarify this issue, we performed bioassays and genetic experiments to uncover the function of the OsJAZ1 degron in rice JA signaling. We found that substitution or deletion of core segments of the degron altered the OsJAZ1-OsCOI1b interaction in a COR-dependent manner. We show that these altered interactions function as a regulator for JA signaling during flower and root development. Our study therefore expands our understanding of how the JAZ degron functions, and provides the means to change the sensitivity and specificity of JA signaling in rice.

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“…JA plays a pivotal role in dark-induced leaf senescence. JAZ genes were found to be significantly induced under dark treatment, and several JAZ genes, such as JAZ7, were reported to negatively regulate dark-induced leaf senescence in Arabidopsis [44,45]. Consistently, all JAZ genes were induced during dark-induced leaf senescence in bermudagrass.…”

Section: Discussionmentioning

confidence: 68%

Transcriptomic Analysis of Dark-Induced Senescence in Bermudagrass (Cynodon dactylon)

Fan

Lou

Shi

et al. 2019

Plants

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Leaf senescence induced by prolonged light deficiency is inevitable whenever turfgrass is cultivated in forests, and this negatively influences the survival and aesthetic quality of the turfgrass. However, the mechanism underlying dark-induced senescence in turfgrass remained obscure. In this study, RNA sequencing was performed to analyze how genes were regulated in response to dark-induced leaf senescence in bermudagrass. A total of 159,207 unigenes were obtained with a mean length of 948 bp. The differential expression analysis showed that a total of 59,062 genes, including 52,382 up-regulated genes and 6680 down-regulated genes were found to be differentially expressed between control leaves and senescent leaves induced by darkness. Subsequent bioinformatics analysis showed that these differentially expressed genes (DEGs) were mainly related to plant hormone (ethylene, abscisic acid, jasmonic acid, auxin, cytokinin, gibberellin, and brassinosteroid) signal transduction, N-glycan biosynthesis, and protein processing in the endoplasmic reticulum. In addition, transcription factors, such as WRKY, NAC, HSF, and bHLH families were also responsive to dark-induced leaf senescence in bermudagrass. Finally, qRT-PCR analysis of six randomly selected DEGs validated the accuracy of sequencing results. Taken together, our results provide basic information of how genes respond to darkness, and contribute to the understanding of comprehensive mechanisms of dark-induced leaf senescence in turfgrass.

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JAZ7 negatively regulates dark-induced leaf senescence inArabidopsis

Abstract: HighlightUnder darkness, JAZ7 was up-regulated and the mutant showed a severe leaf senescence phenotype. Genetics and transcriptomic analysis revealed JAZ7 as an important regulator of dark-induced leaf senescence.

Cited by 113 publications

References 58 publications

Genetic Network between Leaf Senescence and Plant Immunity: Crucial Regulatory Nodes and New Insights

Genetic Network between Leaf Senescence and Plant Immunity: Crucial Regulatory Nodes and New Insights

The OsJAZ1 degron modulates jasmonate signaling sensitivity during rice development

Transcriptomic Analysis of Dark-Induced Senescence in Bermudagrass (Cynodon dactylon)

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