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Arabidopsis thaliana RECEPTOR DEAD KINASE1 Functions as a Positive Regulator in Plant Responses to ABA

Molecular Plant 2017年第2期10卷 223-243页

作者： Dhinesh Kumar Ritesh Kumar dongwon baek Tae-Kyung Hyun Woo Sik Chung Dae-Jin Yun Jae-Yean Kim Division of Applied Life Sciences Plant Molecular Biology and Biotechnology Research Center Gyeongsang National University Jinju 660-701 Korea Department of Industrial Plant Science and Technology Conege of Agricultural Life and Environmental Sciences Chungbuk National University Cheongju 28644Korea These authors contributed equally to this article.

Abscisic acid （ABA） is a major phytohormone involved in important stress-related and developmental plant processes. Membrane-delimited ABA signal transduction plays an important role in early ABA signaling, but the molecular mechanisms connecting core signaling components to the plasma membrane remain un- clear. Plants have evolved a large number of receptor-like kinases （RLKs） to modulate diverse biological processes by perceiving extracellular stimuli and activating downstream signaling responses. In this study, a putative leucine-rich repeat-RLK gene named RECEPTOR DEAD KINASE1 （AtRDK1） was identified and characterized in Arabidopsis thaliana. RDK1 promoter-GUS analysis revealed that RDK1 is expressed ubiq- uitously in the various tissues in Arabidopsis, and its expression is mainly induced by ABA. In the presence of ABA, RDKl-deficient rdkl-1 and rdkl-2 lines showed significant resistance in cotyledon greening and root growth, whereas RDKl-overexpressing lines showed enhanced sensitivity. Consistently, the expres- sion of ABA-responsive genes was significantly downregulated in rdkl mutant seedlings, which were also hypersensitive to drought stress with increased water loss. Interestingly, RDK1 was found to be an atypical kinase localized to the plasma membrane and did not require its kinase activity during ABA-mediated inhi- bition of seedling development. Accordingly, RDK1 interacted in the plasma membrane with type 2C protein phosphatase ABSClSIC ACID INSENSITIVE1 （ABI1）; this interaction was further enhanced by exogenous application of ABA, suggesting that RDKl-mediated recruitment of ABI1 onto the plasma membrane is important for ABA signaling. Taken together, these results reveal an important role for RDK1 in plant responses to abiotic stress conditions in an ABA-dependent manner.

关键词： ABA abiotic stress Arabidopsis atypical kinases protein phosphatases receptor-like kinases

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Rheostatic Control of ABA Signaling through HOS15-Mediated OST1 Degradation

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Molecular Plant 2019年第11期12卷 1447-1462页

作者： Akhtar Ali Jae Kyoung Kim Masood Jan Haris Ali Khan Irfan Ullah Khan Mingzhe Shen Junghoon Park Chae Jin Lim Shah Hussain dongwon baek Kai Wang Woo Sik Chung Vicente Rubio Sang Yeol Lee Zhizhong Gong Woe Yeon Kim Ray ABressan Jose MPardo Dae-Jin Yun Department of Biomedical Science&Engineering Konkuk UniversitySeoul 05029South Korea Department of Mathematical Sciences Korea Advanced Institute of Science and TechnologyDaejeon 34131Korea Division of Applied Life Science Plant Molecular Biology and Biotechnology Research CenterGyeongsang National UniversityJinju 660-701South Korea State Key Laboratory of Plant Physiology and Biochemistry College of Biological SciencesChina Agricultural UniversityBeijing 100193China Centro Nacional de Biotecnologia-CSIC Darwin 3.Campus de la UAM.Cantoblanco28049 MadridSpain Department of Horticulture and Landscape Architecture Purdue University625 Agriculture Mall DriveWest LafayetteIN 47907-2010USA lnstituto de Bioquimica Vegetal y Fotosintesis cicCartujaCSIC-Universidad de SevillaAmericoVespucio 49Sevilla 41092Spain

Dehydrating stresses trigger the accumulation of abscisic acid(ABA),a key plant stress-signaling hormone that activates Snf1-Related Kinases(SnRK2s)to mount adaptive ***,the regulatory circuits that terminate the SnRK2s signal relay after acclimation or post-stress conditions remain to be ***,we show that the desensitization of the ABA signal is achieved by the regulation of OST1(SnRK2.6)protein stability via the E3-ubiquitin ligase *** ABA signal,HOS15-induced degradation of OST1 is inhibited and stabilized OST1 promotes the stress *** the ABA signal terminates,protein phosphatases ABI1/2 promote rapid degradation of OST1 via ***,we found that even in the presence of ABA,OST1 levels are also depleted within hours of ABA signal *** unexpected dynamics of OST1 abundance are then resolved by systematic mathematical modeling,demonstrating a desensitizing feedback loop by which OST1-induced upregulation of ABI1/2 leads to the degradation of *** model illustrates the complex rheostat dynamics underlying the ABA-induced stress response and desensitization.

关键词： ABA signaling drought stress HOS15 OST1 ABI1/2 protein degradation and stability

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Overexpression of Arabidopsis YUCCA6 in Potato Results in High-Auxin Developmental Phenotypes and Enhanced Resistance to Water Deficit

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Molecular Plant 2013年第2期6卷 337-349页

作者： Jeong Im Kim dongwon baek Hyeong Cheol Park Hyun Jin Chun Dong-Ha Oh Min Kyung Lee Joon-Yung Cha Woe-Yeon Kim Min Chul Kim Woo Sik Chung Hans J. Bohner Sang Yeol Lee Ray A. Bressan Shin-Woo Lee Dae-Jin Yun Department of Biochemistry Purdue University West Lafayette IN 47907 USA Division of Applied Life Science (BK21 and WCU Program) Plant Molecular Biology and Biotechnology Research Center Gyeongsang National UniversityJinju 660-701 Republic of Korea Department of Plant Biology University of Illinois at Urbana-Champaign Urbana IL USA Department of Agronomy and Medicinal Plant Resources Gyeongnam National University of Science and Technology Jinju 660-758 Korea Faculty of Science King Abdulaziz University Jeddah 21589 KSA Department of Horticulture Purdue University West Lafayette IN 47907 USA

Indole-3-acetic acid （IAA）, a major plant auxin, is produced in both tryptophan-dependent and tryptophan-independent pathways. A major pathway in Arabidopsis thaliana generates IAA in two reactions from tryptophan. Step one converts tryptophan to indole-3-pyruvic acid （IPA） by tryptophan aminotransferases followed by a rate-limiting step converting IPA to IAA catalyzed by YUCCA proteins. We identified eight putative StYUC （Solanum tuberosum YUCCA） genes whose deduced amino acid sequences share 50%-70% identity with those of Arabidopsis YUCCA proteins. All include canonical, conserved YUCCA sequences： FATGY motif, FMO signature sequence, and FAD-binding and NADP-binding sequences. In addition, five genes were found with -50% amino acid sequence identity to Arabidopsis trypto-phan aminotransferases. Transgenic potato （Solanum tuberosum cv. Jowon） constitutively overexpressing Arabidopsis AtYUC6 displayed high-auxin phenotypes such as narrow downward-curled leaves, increased height, erect stature, and longevity. Transgenic potato plants overexpressing AtYUC6 showed enhanced drought tolerance based on reduced water loss. The phenotype was correlated with reduced levels of reactive oxygen species in leaves. The results suggest a func-tional YUCCA pathway of auxin biosynthesis in potato that may be exploited to alter plant responses to the environment.

关键词： Solanum tuberosum potato Arabidopsis thaliana yuc6-1D YUCCA, StYUCCA, StTAA, auxin, drought.

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防脱洗发水香味与功效的关联性

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香料香精化妆品 2024年第6期 156-159页

作者：陈雯蔡文江白斗鉉崔桐沅李润夏爱茉莉太平洋(上海)研发有限公司上海201801

以防脱洗发水的香味为研究对象,通过分析热销防脱洗发水的香味,总结该类产品的香味风格。使用中心区定点街访的调研方式,了解消费者对防脱洗发水和普通洗发水的香味期待差异和态度,探究有脱发困扰的消费者和普通消费者对防脱洗发水的香... 详细信息

以防脱洗发水的香味为研究对象,通过分析热销防脱洗发水的香味,总结该类产品的香味风格。使用中心区定点街访的调研方式,了解消费者对防脱洗发水和普通洗发水的香味期待差异和态度,探究有脱发困扰的消费者和普通消费者对防脱洗发水的香味喜好度和功效联想等方面的需求。结果表明,柑橘调和水生调的香味是消费者既喜欢又可以联想到防脱功效的味道,适合用在大众防脱产品中。该研究为今后防脱洗发水和普通洗发水的香味选择提供了思路。

关键词：洗发香波嗅觉联想脱发关联性

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