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Molecular plant 2015年第11期8卷 1675-1678页

作者： Jianjun Jiang Tao wang Zhihua Wu Jie wang chi zhang haijiao wang Zhi-Xin wang xuelu wang state key laboratory of genetic engineering and Department of genetics School of Life Sciences Fudan University Shanghai 200438 China College of life Science and Technology Huazhong Agricultural University Wuhan 430070 China MOE key laboratory for protein Science School of Life Sciences Tsinghua University Beijing 100084 China

Dear Editor,Brassinosteroids （Brs） are a class of essential polyhydroxylated steroid hormones regulating plant growth and development, and their responses to environmental cues （Clouse, 2011 ; yang et al., 2011）. Brs are perceived at the plasma membrane by a receptor complex, which consists of two leucine-rich receptor-like kinases （Lrr-rLKs）, BrASSINOSTErOID INSENSITIVE 1 （BrI1） and BrI1-ASSOCIATED rECEpTOr KINASE 1 （BAK1）.

关键词： expression thousands activation

Brassinosteroid Signaling pathway and Its Cross-talk with Abscisic Acid Signaling in plants

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Brassinosteroid Signaling Pathway and Its Cross-talk with Ab...

Ligand perception,Activation,and Early Signaling of plant Steroid receptor Brassinosteroid Insensitive 1

中国植物生理学会第十次会员代表大会暨全国学术年会

作者： Shanshan zhang, Zhenying Cai, Yinwei Cheng, Yongchi Li, and xuelu wang* state key laboratory of genetic engineering, Institute of plant Biology, school of life sciences, fudan university, Handan rd. #220, shanghai 200433.

＜正＞Many phytohormones play essential roles in coordinately regulating biological processes in plant growth and

关键词： Brassinosteroids Absicic Acid Signal transduction Cross-talk

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Journal of Integrative plant Biology 2013年第12期55卷 1198-1211页

作者： Jianjun Jiangwang chi zhangwang xuelu wang state key laboratory of genetic engineering and Institute of plant Biology School of Life SciencesFudan University

Leucine-rich repeat receptor-like kinases （Lrr-rLKs） belong to a large group of cell surface proteins involved in many aspects of plant development and environmental responses in both monocots and dicots. Brassinosteroid insensitive 1 （BrI1）, a member of the Lrr X subfamily, was first identified through several forward genetic screenings for mutants insensitive to brassinosteroids （Brs）, which are a class of plant-specific steroid hormones. Since its identification, BrI1 and its homologs had been proved as receptors perceiving Brs and initiating Br signaling. The co-receptor BrIl-associated kinase 1 and its homologs, and other BrI1 interacting proteins such as its inhibitor BrI1 kinase inhibitor I （BKI1） were identified by genetic andbiochemical approaches. The detailed mechanisms of Br perception by BrI1 and the activation of BrI1 receptor complex have also been elucidated. Moreover, several mechanisms for termination of the activated BrI1 signaling were also discovered. In this review, we will focus on the recent advances on the mechanism of BrI1 phosphorylation and activation, the regulation of its receptor complex, the structure basis of BrI1 ectodomain and Br recognition, its direct substrates, and the termination of the activated BrI1 receptor complex.

关键词： Brassinosteroid insensitive 1-associated kinase 1 brassinosteroid insensitive 1 kinase inhibitor 1 brassinosteroids brassinosteroidinsensitive 1 phosphorylation receptor-like kinase recognition signaling.

BKI1 regulates plant Architecture through Coordinated Inhibition of the Brassinosteroid and ErECTA Signaling pathways in Arabidopsis

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Molecular plant 2017年第2期10卷 297-308页

作者： Dongxu wang cangjing yang haijiao wang Zhihua Wu Jianjun Jiang Jingjing Liu Zhuona He Fang Chang Hong Ma xuelu wang state key laboratory of genetic engineering Department of Genetics School of Life Sciences Fudan University Shanghai 200438 China College of life Science and Technology Huazhong Agricultural University No 1 Shizishan Street Wuhan Hubei 430070 China Ministry of Education key laboratory of Biodiversity sciences and Ecological engineering and Institute of Biodiversity sciences Institute of Plant Biology School of Life Sciences Fudan University Shanghai 200438 China

Hundreds of leucine-rich repeat receptor-like kinases （Lrr-rLKs） play indispensable roles in a wide range of plant developmental and physiological processes. The mechanisms controlling Lrr-rLKs at a basal and inactive status are essential but rarely studied. BKI1 is the only reported inhibitor of receptor kinases in Arabidopsis, which negatively regulates BrI1 in the brassinosteroid pathway. In this study, we found that BKI1 can also interact with another important Lrr-rLK, ErECTA （Er）. phenotypic analysis showed that BKI1 and Er together regulate plant architecture, including pedicel orientation, which is a newly reported phenotype in the Br- and Er-mediated developmental processes. Gene expression analysis revealed that BKI1 regulates a subset of Er-responsive genes. Kinase assays demonstrated that BKI1 inhibits Er kinase activity. In addition, the release of BKI1 inhibition on Er signaling relies largely on BrI1 activation. Our data provide significant insights into the regulation and activation of rLKs and suggest that BKI1 functions as a common suppressor of the BrI1 and Er signaling pathways.

关键词： BKI1 receptor-like kinase ErECTA kinase inhibitor pedicel orientation crosstalk

Homeostasis of Brassinosteroids regulated by DrL1, a putative Acyltransferase in Arabidopsis

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Molecular plant 2013年第2期6卷 546-558页

作者： Wenjiao Zhu haijiao wang Shozo Fujioka Tao Zhou Hailong Tian Weisheng Tian xuelu wang state key laboratory of genetic engineering and Institute of plant Biology School of Life Sciences Fudan University Shanghai 200433 People's Republicof China rIKEN Advanced Science Institute Wako Saitama 351-0198 Japan key laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling RoadShanghai 200032 China

Brassinosteroids （Brs） play essential roles in regulating various aspects of plant growth and development and in responding to diverse environmental cues, and their metabolism is an important way to regulate their homeosta-sis in plants. Here, we identified a dominant mutant, dwarf and round leaf-1 （drll-D）, which exhibits weak Br-deficient or Br-insensitive mutant phenotypes, including short and round leaves, prolonged senescence, dwarfed shape, and altered expression levels of the Br-responsive genes. Hypocotyl length and root inhibition assays suggest that the drll-D mutant responds to Brs normally, but has decreased Br signaling outputs. The endogenous levels of several Brs, includ-ing typhasterol （TY）, 6-deoxotyphasterol （6-deoxoTY）, and 6-deoxocastasterone （6-deoxoCS）, are significantly lower in the drll-D mutant than in the wild-type. The DrL1 gene encodes an acyltransferase and is widely expressed in leaves, roots, flowers, and siliques. plants without DrL1 and its homologs are larger with an enhanced Br signaling. The expres-sion of DrL1 was induced by eBL and inhibited by ABA. DrL1 is involved in the Br metabolism likely by catalyzing the Br conjugation through esterification, which plays important roles in regulating the Br homeostasis and responding to abiotic stresses in Arabidopsis.

关键词： DrL1 (dwarf and round leaf 1) brassinosteroid acyltransferase 6-deoxoCS metabolism.

Abscisic Acid Signaling Inhibits Bmssinosteroid Signaling through Dampening the Dephosphorylation of BIN2 by ABI1 and ABI2

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Molecular plant 2018年第2期11卷 315-325页

作者： haijiao wang Jie Tang Jing Liu Jin Hu Jingjing Liu Yuxiao Chen Zhenying Cai xuelu wang Center of Integrative Biology College of Life Science and Technology Huazhong Agricultural University Wuhan 430070 China state key laboratory of genetic engineering Department of Genetics School of Life Sciences Fudan University Shanghai 200433 China

Abscisic acid （ABA） and brassinosteroid （Br） antagonistically regulate many aspects of plant growth and development. previous physiological studies have revealed that the inhibition of Br signaling by ABA is largely dependent on ABI1 and ABI2. However, the genetic and molecular basis of how ABI1 and ABI2 are involved in inhibiting Br signaling remains unclear. Although it is known that in the Br signaling pathway the ABA-Br crosstalk occurs in the downstream of Br receptor complex but upstream of BIN2 kinase, a negative regulator of Br signaling, the component that acts as the hub to directly mediate their crosstalk remains a big mystery. Here, we found that ABI1 and ABI2 interact with and dephosphorylate BIN2 to regu- late its activity toward the phosphorylation of BESl. Byin vitro mimicking ABA signal transduction, we found that ABA can promote BIN2 phosphorylation by inhibiting ABI2 through ABA receptors. rNA-sequencing analysis further demonstrated that ABA inhibits Br signaling through the ABA primary signaling components, including its receptors and ABI2, and that ABA and GSK3s co-regulate a common set of stress- responsive genes. Because BIN2 can interact with and phosphorylate SnrK2s to activate its kinase activity, our study also reveals there is a module of pp2Cs--BIN2-SnrK2s in the ABA signaling pathway. Collectively, these findings provide significant insights into how plants balance growth and survival by coordinately regu- lating the growth-promoting signaling pathway and stress responses under abiotic stresses.

关键词： Brassinosteroids Abscisic acid GSK3 cross-talk phosphatase

Multiple Ways of BES1/BZr1 Degradation to Decode Distinct Developmental and Environmental Cues in plants

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Molecular plant 2017年第7期10卷 915-917页

作者： Mengran yang xuelu wang Center of Integrative Biology College of Life Science and Technology Huazhong Agricultural University Wuhan 430070 China state key laboratory of genetic engineering Department of Genetics School of Life Sciences Fudan University Shanghai 200438 China

plants must constantly integrate various environment stimuli and many endogenous hormones to optimize their growth and development. BrI1-EMS-SUpprESSOr 1 （BES1） and BrASSINAZOLE rESISTANT 1 （BZr1） act not only as key transcription factors in the brassinosteroid （Br） signaling pathway, but also as a hub that integrates diverse signals to regulate plant development and environment adaptability （wang et al., 2014）.

关键词： GENE-EXprESSION ArABIDOpSIS BES1 BZr1 GrOWTH

Brassinosteroid signaling network and plant development

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Brassinosteroid signaling network and plant development

The epidermis-specific cyclin CYCp3;1 is involved in the excess brassinosteroid signaling-inhibited root meristem cell division

2013全国植物生物学大会

作者： wang haijiao yang cangjin ZHU Wenjiao wang xuelu state key laboratory of genetic engineering Institute of Plant BiologySchool of Life SciencesFudan University

Brassinosteroids(Brs) are a class of plant specific steroid hormones and play essential role in regulating various developmental processes in *** are perceived by a cell surface leucine-rich re

关键词： Brassinosteroids signal transduction plant development protein kinase 14-3-3 BKI1

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Journal of Integrative plant Biology 2020年第11期62卷 1674-1687页

作者： Yuxiao Chen Shiyong Sun xuelu wang state key laboratory of genetic engineering Department of GeneticsSchool of Life SciencesFudan UniversityShanghai 200433China state key laboratory of Crop Stress Adaptation and Improvement Henan UniversityKaifeng 475001China

Cell division is precisely regulated and highly tissue-specific;studies have suggested that diverse signals in the epidermis,especially the epidermal brassinosteroids(Brs),can regulate root ***,the underlying molecular mechanisms that integrate hormonal cues such as Br signaling with other endogenous,tissue-specific developmental programs to regulate epidermal cell proliferation remain *** this study,we used molecular and biochemical approaches,microscopic imaging and genetic analysis to investigate the function and mechanisms of a p-type cyclin in root growth *** found that CYCp3;1,specifically expressed in the root meristem epidermis and lateral root cap,can regulate meristem cell *** analyses and biochemical studies demonstrated that CYCp3;1 promotes cell division at the G2-M duration by associating and activating cyclin-dependent kinase B2-1(CDKB2;i).Furthermore,we found that CYCp^;1 expression was inhibited by Br signaling through BrI1-EMS-SUpprESSOr1(BES1),a positive downstream transcription factor in the Br signaling *** findings not only provide a mechanism of how root epidermal-specific regulators modulate root growth,but also reveal why the excess of Brs or enhanced Br signaling inhibits cell division in the meristem to negatively regulate root growth.

关键词： inhibited endogenous excess