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Kerchev PI Pellny TK Vivancos PD Kiddle G Hedden P Driscoll S Vanacker H Verrier P Hancock RD Foyer CH 《The Plant cell》2011,23(9):3319-3334
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The antagonistic regulation of abscisic acid‐inhibited root growth by brassinosteroids is partially mediated via direct suppression of ABSCISIC ACID INSENSITIVE 5 expression by BRASSINAZOLE RESISTANT 1 下载免费PDF全文
Xiaorui Yang Yang Bai Jianxiu Shang Ruijiao Xin Wenqiang Tang 《Plant, cell & environment》2016,39(9):1994-2003
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种子发育是一个复杂的生物学过程,受各种遗传和外界因素的调节,显著影响农作物特别是禾谷类作物的种子活力和产量与质量。脱落酸(ABA)是调控种子发育和萌发最重要的植物激素之一,其活性水平、信号转导及其LAFL网络在种子发育包括胚胎发生和成熟过程的调控中起关键作用。该文主要综述了近年来ABA调控种子发育的研究取得的重要进展,包括ABA代谢和信号转导对种子发育的调控,ABA与种子成熟转录因子(AFL-B3、FUS3、ABI3、LEC2等)的作用,以及ABA在种子发育中的作用机制,并提出了需要进一步研究的科学问题,为深入理解种子发育的分子机制提供参考,从而提高种子的活力、产量和质量。 相似文献
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Julia Santiago Americo Rodrigues Angela Saez Silvia Rubio Regina Antoni Florine Dupeux Sang‐Youl Park José Antonio Márquez Sean R. Cutler Pedro L. Rodriguez 《The Plant journal : for cell and molecular biology》2009,60(4):575-588
Abscisic acid (ABA) is a key phytohormone involved in adaption to environmental stress and regulation of plant development. Clade A protein phosphatases type 2C (PP2Cs), such as HAB1, are key negative regulators of ABA signaling in Arabidopsis. To obtain further insight into regulation of HAB1 function by ABA, we have screened for HAB1‐interacting partners using a yeast two‐hybrid approach. Three proteins were identified, PYL5, PYL6 and PYL8, which belong to a 14‐member subfamily of the Bet v1‐like superfamily. HAB1–PYL5 interaction was confirmed using BiFC and co‐immunoprecipitation assays. PYL5 over‐expression led to a globally enhanced response to ABA, in contrast to the opposite phenotype reported for HAB1‐over‐expressing plants. F2 plants that over‐expressed both HAB1 and PYL5 showed an enhanced response to ABA, indicating that PYL5 antagonizes HAB1 function. PYL5 and other members of its protein family inhibited HAB1, ABI1 and ABI2 phosphatase activity in an ABA‐dependent manner. Isothermal titration calorimetry revealed saturable binding of (+)ABA to PYL5, with Kd values of 1.1 μm or 38 nm in the absence or presence of the PP2C catalytic core of HAB1, respectively. Our work indicates that PYL5 is a cytosolic and nuclear ABA receptor that activates ABA signaling through direct inhibition of clade A PP2Cs. Moreover, we show that enhanced resistance to drought can be obtained through PYL5‐mediated inhibition of clade A PP2Cs. 相似文献
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Heterotrimeric G-proteins are important signal transducers in all eukaryotes. The plant hormone abscisic acid (ABA) has emerged as a key regulator of G-protein-mediated signaling pathways in plants. ABA-regulation of G-protein signaling involves both conventional and novel mechanisms. We have utilized the null mutant of the Arabidopsis G-protein α subunit gpa1 to evaluate to what extent ABA-dependent changes in the proteome are regulated by G-proteins. We used Arabidopsis root tissue as both ABA and G-proteins, individually and in combination, affect root growth and development. We identified 720 proteins, of which 42 showed GPA1-dependent and 74 showed ABA-dependent abundance changes. A majority of ABA-regulated proteins were also GPA1-dependent. Our data provide insight into how tissue specificity might be achieved in ABA-regulated G-protein signaling. A number of proteins related to ER body formation and intracellular trafficking were altered in gpa1 mutant, suggesting a novel role for GPA1 in these pathways. A potential link between ABA metabolism and ABA signaling was also revealed. The comparison of protein abundance changes in the absence of ABA offers clues to the role of GPA1 in ABA-independent signaling pathways, for example, regulation of cell division. These findings substantially contribute to our knowledge of G-protein signaling mechanisms in plants. 相似文献
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The Mg-Chelatase H Subunit of Arabidopsis Antagonizes a Group of WRKY Transcription Repressors to Relieve ABA-Responsive Genes of Inhibition 总被引:4,自引:0,他引:4
Yi Shang Lu Yan Zhi-Qiang Liu Zheng Cao Chao Mei Qi Xin Fu-Qing Wu Xiao-Fang Wang Shu-Yuan Du Tao Jiang Xiao-Feng Zhang Rui Zhao Hai-Li Sun Rui Liu Yong-Tao Yu Da-Peng Zhang 《The Plant cell》2010,22(6):1909-1935
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Lan Li Bin Li Sirui Zhu Long Wang Limei Song Jia Chen Zhenhua Ming Xuanming Liu Xiushan Li Feng Yu 《植物学报(英文版)》2021,63(6):1161-1178
In plants, clade A type 2C protein phosphatases (PP2CAs) have emerged as major players in abscisic acid (ABA)-regulated stress responses by inhibiting protein kinase activity. However, how different internal and external environmental signals modulate the activity of PP2CAs are not well known. The transmembrane kinase (TMK) protein 4 (TMK4), one member of a previously identified receptor kinase subfamily on the plasma membrane that plays vital roles in plant cell growth, directly interacts with PP2CAs member (ABA-Insensitive 2, ABI2). tmk4 mutant is hypersensitive to ABA in both ABA-inhibited seed germination and primary root growth, indicating that TMK4 is a negative regulator in ABA signaling pathway. Further analyses indicate that TMK4 phosphorylates ABI2 at three conserved Ser residues, thus enhancing the activity of ABI2. The phosphorylation-mimic ABI2S139DS140DS266D can complement but non-phosphorylated form ABI2S139AS140AS266A cannot complement ABA hypersensitive phenotype of the loss-of-function mutant abi1-2abi2-2. This study provides a previously unidentified mechanism for positively regulating ABI2 by a plasma membrane protein kinase. 相似文献
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Soo Young Kim 《Journal of Plant Biology》2007,50(2):117-121
Abscisic acid (ABA) is a major plant hormone that controls germination, seedling growth, and seed development. During the
vegetative phase, ABA plays a key regulatory role in adaptive responses to common abiotic stresses, such as drought, high
salinity, and cold. In seeds, ABA modulates the synthesis of storage components and prevents the precocious germination of
embryos. ABA-regulated processes are critical for plant growth and survival, especially under unfavorable environmental conditions.
Numerous genetic and biochemical studies to delineate signal transduction pathways have led to the identification of a large
number of ABA signaling components. However, our knowledge about specific response pathways is still fragmentary. Over the
past several years, significant progress has been made in identifying key regulators of early events in the ABA response.
In this short review, new advances in ABA signaling research, especially those focused on ABA receptors, will be summarized. 相似文献
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韧皮部取食昆虫诱导的植物防御反应 总被引:3,自引:0,他引:3
刺吸式昆虫与寄主植物之间具有特殊的生物互作关系。本文对刺吸式昆虫取食韧皮部诱导的植物防御反应类型、 防御物质变化、 信号途径以及植物反应转录组学研究等方面进行综述。韧皮部取食昆虫取食诱导的植物防御反应机制主要包括: (1)改变自身的营养状况; (2)产生有毒的次生化合物; (3)产生防御蛋白。防御反应与植物水杨酸、 茉莉酸、 乙烯等信号分子密切相关。研究表明, 刺吸式昆虫取食诱导的植物防御反应主要引发以水杨酸为主的信号途径, 但相关分子互作机制还有待明确。日益丰富的基因组资源和不断发展的分子生物学技术为揭示植物防御反应中信号分子的作用机制、 找出植物内生抗性的特异因子以及阐明诱导防御机制奠定了基础。了解刺吸式昆虫取食诱导的植物防御反应, 为深入理解植物-昆虫间协同进化关系提供了依据, 为害虫治理和抗虫植物的培育提供了新的思路。 相似文献