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brassinosteroids fine-tune secondary and primary sulfur metabolism through BZR1-mediated transcriptional regulation

Journal of Integrative Plant Biology 2023年第5期65卷 1153-1169页

作者： Mengyu Wang Congxi Cai Yubo Li Han Tao Fanliang Meng Bo Sun Huiying Miao Qiaomei Wang Department of Horticulture Key Laboratory of Horticultural Plant GrowthDevelopment and Quality improvementMinistry of AgricultureZhejiang UniversityHangzhou 310058China School of Horticulture and Landscape Architecture Yangzhou UniversityYangzhou 221116China Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province Zhejiang Academy of Agricultural SciencesHangzhou 310021China College of Horticulture Sichuan Agricultural UniversityChengdu 611130China

For adaptation to ever-changing environments,plants have evolved elaborate metabolic systems coupled to a regulatory network for optimal growth and defense. Regulation of plant secondary metabolic pathways such as glucosinolates(GSLs) by defense phytohormones in response to different stresses and nutrient deficiency has been intensively investigated, while how growth-promoting hormone balances plant secondary and primary metabolism has been largely unexplored. Here, we found that growth-promoting hormone brassinosteroid(BR) inhibits GSLs accumulation while enhancing biosynthesis of primary sulfur metabolites, including cysteine(Cys) and glutathione(GSH) both in Arabidopsis and Brassica crops, fine-tuning secondary and primary sulfur metabolism to promote plant growth. Furthermore, we demonstrate that of BRASSINAZOLE RESISTANT 1(BZR1), the central component of BR signaling, exerts distinct transcriptional inhibition regulation on indolic and aliphatic GSL via direct MYB51 dependent repression of indolic GSL biosynthesis, while exerting partial MYB29 dependent repression of aliphatic GSL biosynthesis. Additionally, BZR1 directly activates the transcription of APR1 and APR2 which encodes rate-limiting enzyme adenosine 5′-phosphosulfate reductases in the primary sulfur metabolic pathway.In summary, our findings indicate that BR inhibits the biosynthesis of GSLs to prioritize sulfur usage for primary metabolites under normal growth conditions.These findings expand our understanding of BR promoting plant growth from a metabolism perspective.

关键词： brassinosteroids BZR1 glucosinolates plant growth primary sulfur metabolites secondary sulfur metabolites

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brassinosteroids inhibit miRNA-mediated translational repression by decreasing AGO1 on the endoplasmic reticulum

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Journal of Integrative Plant Biology 2021年第8期63卷 1475-1490页

作者： Taiyun Wang Yanhua Zheng Qi Tang Songxiao Zhong Wei Su Binglian Zheng State Key Laboratory of Genetic Engineering Ministry of Education Key Laboratory of Biodiversity Sciences and Ecological EngineeringCollaborative Innovation Center of Genetics and DevelopmentInstitute of Plant BiologySchool of Life SciencesFudan UniversityShanghai200438 China

Translational repression is a conserved mechanism in microRNA(miRNA)-guided gene silencing.In Arabidopsis,ARGONAUTE1(AGO1),the major miRNA effector,localizes in the cytoplasm for mRNA cleavage and at the endoplasmic reticulum(ER)for translational repression of target genes.However,the mechanism underlying miRNA-mediated translational repression is poorly understood.In particular,how the subcellular partitioning of AGO1 is regulated is largely unexplored.Here,we show that the plant hormone brassinosteroids(BRs)inhibit miRNA-mediated translational repression by negatively regulating the distribution of AGO1 at the ER in Arabidopsis thaliana.We show that the protein levels rather than the transcript levels of miRNA target genes were reduced in BR-deficient mutants but increased under BR treatments.The localization of AGO1 at the ER was significantly decreased under BR treatments while it was increased in the BR-deficient mutants.Moreover,ROTUNDIFOLIA3(ROT3),an enzyme involved in BR biosynthesis,co-localizes with AGO1 at the ER and interacts with AGO1 in a GW motif-dependent manner.Complementation analysis showed that the AGO1-ROT3 interaction is necessary for the function of ROT3.Our findings provide new clues to understand how miRNA-mediated gene silencing is regulated by plant endogenous hormones.

关键词： AG01 Arabidopsis thaliana brassinosteroids endoplasmic reticulum miRNA translational repression

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brassinosteroids mediate the effect of high temperature during anthesis on the pistil activity of photo-thermosensitive genetic male-sterile rice lines

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The Crop Journal 2021年第1期9卷 109-119页

作者： Jing Chen Keqi Fei Weiyang Zhang Zhiqin Wang Jianhua Zhang Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops Yangzhou UniversityYangzhou 225009JiangsuChina Department of Biology Hong Kong Baptist UniversityHong KongChina School of Life Sciences and State Key Laboratory of Agrobiotechnology The Chinese University of Hong KongHong KongChina

brassinosteroids(BRs)play critical roles in a wide range of plant developmental processes.However,it is unknown whether and how BRs mediate the effect of high temperature(HT)stress during anthesis on the pistil activity of photo-thermosensitive genetic male-sterile(PTSGMS)rice(Oryza sativa L.)lines.This study investigated the question.Three pot-grown PTSGMS rice lines were subjected to HT stress during anthesis.The contents of 24-epibrassinolide(24-EBL)and 28-homobrassinolide(28-HBL),the major forms of BR in rice plants,and levels of reactive oxygen species(ROS)or antioxidants(AOS),hydrogen peroxide(H2O2),1-aminocylopropane-1-carboxylic acid(ACC),ascorbic acid(AsA),and catalase activity in pistils,were determined.HT stress significantly reduced the contents of both 24-EBL and 28-EBL relative to those under normal temperatures,but the reduction varied by PTSGMS line.A line with higher BR contents under HT stress showed lower contents of ACC and H2O2,higher catalase activity and AsA content in pistils,and higher fertilization rate,seed-setting rate,and seed yield when the line was crossed with a restorer line,indicating that higher levels of BRs increase HT stress resistance.Applying 24-EBL,28-HBL or an inhibitor of BR biosynthesis confirmed the roles of BRs in response to HT stress.The results suggest that BRs mediate the effect of HT stress on pistil activity during anthesis and alleviate the harm of HT stress by increasing AOS and suppressing ROS generation.

关键词： Rice Photo-thermosensitive genetic male-sterile(PTSGMS) High temperature brassinosteroids Pistil activity

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brassinosteroids modulate nitrogen physiological response and promote nitrogen uptake in maize(Zea mays L.)

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The Crop Journal 2022年第1期10卷 166-176页

作者： Jiapeng Xing Yubin Wang Qingqing Yao Yushi Zhang Mingcai Zhang Zhaohu Li State Key Laboratory of Plant Physiology and Biochemistry College of Agronomy and BiotechnologyChina Agricultural UniversityBeijing 100193China Crop Research Institute Shandong Academy of Agricultural SciencesJinan 250100ShandongChina

brassinosteroids(BRs)are steroid hormones that function in plant growth and development and response to environmental stresses and nutrient supplies.However,few studies have investigated the effect of BRs in modulating the physiological response to nitrogen(N)supply in maize.In the present study,BR signalingdeficient mutant zmbri1-RNAi lines and exogenous application of 2,4-epibrassinolide(e BL)were used to study the role of BRs in the regulation of physiological response in maize seedlings supplied with N.Exogenous application of e BL increased primary root length and plant biomass,but zmbri1 plants showed shorter primary roots and less plant biomass than wild-type plants under low N(LN)and normal N(NN)conditions.LN induced the expression of the BR signaling-associated genes Zm DWF4,Zm CPD,Zm DET2,and Zm BZR1 and the production of longer primary roots than NN.Knockdown of Zm BRI1 weakened the biological effects of LN-induced primary root elongation.e BL treatment increased N accumulation in shoots and roots of maize seedlings exposed to LN or NN treatment.Correspondingly,zmbri1 plants showed lower N accumulation in shoots and roots than wild-type plants.Along with reduced N accumulation,zmbri1 plants showed lower NO3-fluxes and^(15)NO_(3)^(-)uptake.The expression of nitrate transporter(NRT)genes(Zm NPF6.4,Zm NPF6.6,Zm NRT2.1,Zm NRT2.2)was lower in zmbri1 than in wild-type roots,but e BL treatments up-regulated the transcript expression of NRT genes.Thus,BRs modulated N physiological response and regulated the transcript expression of NRT genes to promote N uptake in maize.

关键词： brassinosteroids Nitrogen uptake Nitrate transporter gene Root architecture Maize

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brassinosteroids Regulate Root Growth, Development, and Symbiosis

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Molecular Plant 2016年第1期9卷 86-100页

作者： Zhuoyun Wei Jia Li Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life Sciences Lanzhou University Lanzhou 730000 China

brassinosteroids （BRs） are natural plant hormones critical for growth and development. BR-deficient or signaling mutants show significantly shortened root phenotypes. But for a long time, it was thought that these phenotypes were solely caused by reduced root cell elongation in the mutants. Functions of BRs in regulating root development have been largely neglected. Recent detailed analyses, however, revealed that BRs are not only involved in root cell elongation but are also involved in many aspects of root development, such as maintenance of meristem size, root hair formation, lateral root initiation, gravitropic response, mycorrhiza formation, and nodulation in legume species. In this review, current findings on the functions of BRs in mediating root growth, development, and symbiosis are discussed.

关键词： brassinosteroids root meristem root hair lateral root development gravitropic response symbiosis

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brassinosteroids promote thermotolerance through releasing BIN2-mediated phosphorylation and suppression of HsfA1 transcription factors in Arabidopsis

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Plant Communications 2022年第6期3卷 282-298页

作者： Jinyu Luo Jianjun Jiang Shiyong Sun Xuelu Wang College of Life Science and Technology Huazhong Agricultural UniversityWuhan 430070China State Key Laboratory of Crop Stress Adaptation and Improvement Henan UniversityKaifeng 475004China Sanya Institute of Henan University Sanya 572025China

High temperature adversely affects plant growth and development.The steroid phytohormones brassinosteroids(BRs)are recognized to play important roles in plant heat stress responses and thermotolerance,but the underlying mechanisms remain obscure.Here,we demonstrate that the glycogen synthase kinase 3(GSK3)-like kinase BRASSINOSTEROID INSENSITIVE2(BIN2),a negative component in the BR signaling pathway,interacts with the master heat-responsive transcription factors CLASS A1 HEAT SHOCK TRANSCRIPTION FACTORS(HsfA1s).Furthermore,BIN2 phosphorylates HsfA1d on T263 and S56 to suppress its nuclear localization and inhibit its DNA-binding ability,respectively.BR signaling promotes plant thermotolerance by releasing the BIN2 suppression of HsfA1d to facilitate its nuclear localization and DNA binding.Our study provides insights into the molecular mechanisms by which BRs promote plant thermotolerance by strongly regulating HsfA1d through BIN2 and suggests potential ways to improve crop yield under extreme high temperatures.

关键词： brassinosteroids thermotolerance BIN2 HsfA1d phosphorylation

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Strigolactones and brassinosteroids Antagonistically Regulate the Stability of the D53-OsBZR1 Complex to Determine FC1 Expression in Rice Tillering

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Molecular Plant 2020年第4期13卷 586-597页

作者： Zhongming Fang Yuanyuan Ji Jie Hu Renkang Guo Shiyong Sun Xuelu Wang National Key Laboratory of Crop Genetic Improvement and Center of Integrative Biology College of Life Science and TechnologyHuazhong Agricultural UniversityWuhan 430070 China College of Agricultural Sciences Guizhou UniversityGuiyang 550025 China Department of Genetics School of Life SciencesFudan UniversityShanghai 200438 China

Rice tillering,a key architecture trait determ ining grain yield,is highly regulated by a class of newly identified phytohorm ones,strigolactones(SLs).How ever,the whole SL signaling pathw ay from the receptor to dow nstream transcription factors to finally inhibit tillering remains unrevealed.In this study,we first found that brassinosteroids(BRs)strongly enhance tillering by prom oting bud outgrow th in rice,which is largely different from the function of BRs in Arabidopsis.Genetic and biochem ical analyses indicated that both the SL and BR signaling pathw ays control rice tillering by regulating the stability of D53 and/or the OsBZR1 RLA1-DLT module,a transcriptional complex in the rice BR signaling pathway.We further found that D53 interacts with OsBZR1 to inhibit the expression of FC1,a local inhibitor of tillering,and that this inhibition depends on direct DNA binding by OsBZR1,which recruits D53 to the FC1 promoter in rice buds.Taken together,these findings uncover a mechanism illustrating how SLs and BRs coordinately regulate rice tillering via the early responsive gene FC1.

关键词： rice tillering,strigolactones brassinosteroids D53 OsBZFM FCY

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Roles of jasmonates and brassinosteroids in rice responses to high temperature stress——A review

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The Crop Journal 2021年第5期9卷 977-985页

作者： Jianchang Yang Wenqian Miao Jing Chen Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops College of AgricultureYangzhou UniversityYangzhou 225009JiangsuChina

High temperature (HT) stress has become one of the most detrimental stresses in crop production among constantly changing environmental factors.Exploiting approaches to enhance crop thermotolerance would have great significance in assuaging adverse effects of HT stress on crop growth and development.As jasmonates (JAs) and brassinosteroids (BRs) are novel phytohormones and play important roles in responses to biotic and abiotic stresses and in a wide range of plant developmental processes,this paper reviewed the roles and mechanisms of JAs and BRs in mitigating HT stress,with focus on rice (Oryza sativa L.) subjected to HT stress during anthesis.It is demonstrated that JAs alleviate spikelet-opening impairment and BRs ameliorate pistil fertilization ability under HT stress during anthesis of rice,although there are controversial observations.Activating the defense system,enhancing osmotic regulation,protecting photosynthesis,and interacting with other phytohormones,especially with ethylene and abscisic acid,are main physiological mechanisms by which JAs or BRs attenuate HT stress to plants.Elevating levels of JAs or BRs in plants could be considered as an important approach to enhance crop thermotolerance through breeding new varieties.Using JAs or BRs as chemical regulators and adopting proper water and nitrogen management practices could reduce the harm of HT stress to rice.Further research is needed to elucidate the roles of JAs and BRs in different plant tissues in responses to HT stress under different genetic backgrounds and environments,reveal the molecular mechanism underlying JAs and BRs mediating HT stress,understand the cross-talk between phytohormones in modulating HT stress,and establish integrated crop management to minimize the hazard of HT stress in rice production.

关键词： brassinosteroids High temperature stress Jasmonates Rice Thermotolerance

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brassinosteroids promote seed development and physiological maturity of oilseed rape (Brassica napus L.)

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Oil Crop Science 2017年第2期2卷 122-130页

作者： Lin Wan Fengqi Zhang Liyan Zhang Lixin Liu Chang Chen Ni Ma Chunlei Zhang Key Laboratory of Biology and Genetic Improvement of Oil Crops Ministry of Agriculture Key Laboratory of Crop Cultivation and Physiology Ministry of Agriculture Oil Crops Research Institute Chinese Academy of Agricultural SciencesWuhan China Chemistry and Material Science College Nanjing Normal University Nanjing China

Long developmental stage and late harvest time of winter rapeseed (Brassica napus L.) have great negative effects on rice planting of rice-rapeseed farming system in China. Early maturity improvement of rapeseed is necessary. ‘Zhongshuang 11’, an elite winter rapeseed cultivar, was used in consecutive field experiments during 2010-2012. At initial flowering stage, plants were consecutively sprayed with 0.1 mg/L 2-4-Epibrassinolide(BR) for 3 d. Two hundred sampling pods from different plants were randomly collected to measure seed related indexes with a 4 d interval from 7 to 47 d after peak anthesis (DAPA).Seed color turned light brown at 31 or 35 DAPA after BR treatment, seed dry weight (DWT)was increased while seed moisture content (SMC) was decreased during seed development.DWT almost reached the maximum value when SMC was 33.20% at 31 DAPA in 2010-2011 and 35.29% at 35 DAPA in 2011-2012 growing season after BR treatment. Similarly,the maximum values of standard germination test (SGT), accelerated aging test (AAT)and cold test (CT) were observed at 31 or 35 DAPA after BR treatment respectively. The high yield and seed oil content appeared at 31 or 35 DAPA accompanied with rapid decrease in total non-structural carbohydrate (TNC) in stems and leaves. Our study indicated that BR application advanced maturity of winter rapeseed by 4 to 8 days.

关键词： winter oilseed rape (B. napus L.) brassinosteroids early maturity seed production seed quality

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brassinosteroids promote anthocyanin biosynthesis under low nitrogen conditions in Arabidopsis

Brassinosteroids promote anthocyanin biosynthesis under low ...

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2016年全国植物生物学大会

作者： Lifei Gu Tiantian Jiang Qian-Feng Li Chunming Wang Junxian He School of Life Sciences and State Key Laboratory of Agribiotechnology Shenzhen Research InstituteThe Chinese University of Hong Kong

brassinosteroids(BRs) are steroid plant hormones that regulate many developmental and physiological processes in pants including responses to stress. However,little is known about BR regulation of plant responses to mineral nutrients. Our recent studies indicate that BR can induce plant tolerance to low nitrogen(N) stress in Arabidopsis and enhance low N-induced anthocyanin biosynthesis,which seem to be both mediated by the BR-activated transcription factor BZR1. BZR1 physically interacts with PAP1,a key transcription factor controlling anthocyanin biosynthesis in Arabidopsis,and enhances PAP1′s transcriptional regulatory activity on its target genes in anthocyanin biosynthesis. BZR1 can also bind the promoters of some of the anthocyanin biosynthetic genes but the binding appears to be not specific,suggesting that BR promotes anthocyanin biosynthesis under low N mainly through BZR1-PAP1 interaction. As a conclusion,our study indicates that BR is capable of promoting low N-induced anythocyanin biosynthesis,which may help plants survive the low N stress conditions.

关键词： brassinosteroids nitrogen stress anthocyanin biosynthesis Arabidopsis thaliana

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