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Interaction of brassinosteroid and cytokinin promotes ovule initiation and increases seed number per silique in Arabidopsis

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Journal of Integrative Plant Biology 2022年第3期64卷 702-716页

作者： Song-Hao Zu Yu-Tong Jiang Jin-Hui Chang Yan-Jie Zhang Hong-Wei Xue Wen-Hui Lin School of Life Sciences and Biotechnology The Joint International Research Laboratory of Metabolic and Developmental SciencesJoint Center for Single Cell BiologyShanghai Jiao Tong UniversityShanghai 200240China School of Agriculture and Biology Joint Center for Single Cell BiologyShanghai Jiao Tong UniversityShanghai 200240China

Ovule initiation is a key step that strongly influences ovule number and seed yield.Notably,mutants with enhanced brassinosteroid(BR)and cytokinin(CK)signaling produce more ovules and have a higher seed number per silique(SNS)than wild-type plants.Here,we crossed BR-and CKrelated mutants to test whether these phytohormones function together in ovule initiation.We determined that simultaneously enhancing BR and CK contents led to higher ovule and seed numbers than enhancing BR or CK separately,and BR and CK enhanced each other.Further,the BR-response transcription factor BZR1 directly interacted with the CK-response transcription factor ARABIDOPSIS RESPONSE REGULATOR1(ARR1).Treatments with BR or BR plus CK strengthened this interaction and subsequent ARR1 targeting and induction of downstream genes to promote ovule initiation.Enhanced CK signaling partially rescued the reduced SNS phenotype of BR-deficient/insensitive mutants whereas enhanced BR signaling failed to rescue the low SNS of CK-deficient mutants,suggesting that BR regulates ovule initiation and SNS through CK-mediated and-independent pathways.Our study thus reveals that interaction between BR and CK promotes ovule initiation and increases seed number,providing important clues for increasing the seed yield of dicot crops.

关键词： brassinosteroid cytokinin ovule initiation protein interaction seed number per silique

GmBES1-1 dampens the activity of GmNSP1/2 to mediate brassinosteroid inhibition of nodulation in soybean

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Plant Communications 2023年第6期4卷 244-258页

作者： Xu Chen Xiaotong Hu Haijiao Wang Jing Liu Yaqi Peng Chunmei He Miao He Xuelu Wang Center of Integrative Biology College of Life Science and TechnologyHuazhong Agricultural UniversityWuhan 430070China State Key Laboratory of Crop Stress Adaptation and Improvement School of Life SciencesHenan UniversityZhengzhou 450046China Academy for Advanced Interdisciplinary Studies Henan UniversityZhengzhou 450046China Sanya Institute of Henan University Sanya 572025China

Soybean(Glycine max)forms root nodules to house rhizobial bacteria for biological nitrogen fixation.The development of root nodules is intricately regulated by endogenous and exogenous cues.The phytohormones brassinosteroids(BRs)have been shown to negatively regulate nodulation in soybean,but the underlying genetic and molecular mechanisms remain largely unknown.Here,we performed transcriptomic analyses and revealed that BR signaling negatively regulates nodulation factor(NF)signaling.We found that BR signaling inhibits nodulation through its signaling component GmBES1-1 by dampening NF signaling and nodule formation.In addition,GmBES1-1 can directly interact with both GmNSP1 and GmNSP2 to inhibit their interaction and the DNA-binding activity ofGmNSP1.Furthermore,BR-induced nuclear accumulation of GmBES1-1 is essential for inhibiting nodulation.Taken together,our results demonstrate that regulation ofGmBES1-1 subcellular localization by BRs plays a key role in the legume–rhizobium symbiosis and plant development,indicating a crosstalk mechanism between phytohormone and symbiosis signaling pathways.

关键词： nodulation brassinosteroid crosstalk GmBES1-1 GmNSP1/2

The divergence of brassinosteroid sensitivity between rice subspecies involves natural variation conferring altered internal auto-binding of OsBSK2

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Journal of Integrative Plant Biology 2022年第8期64卷 1614-1630页

作者： Wenchao Yin Lulu Li Zhikun Yu Fan Zhang Dapu Liu Hongkai Wu Mei Niu Wenjing Meng Xiaoxing Zhang Nana Dong Yanzhao Yang Jihong Liu Yongqiang Liu Guoxia Zhang Jianlong Xu Shimei Wang Chengcai Chu Qian Qian Hongning Tong National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China Rice Research Institute of Anhui Academy of Agricultural Sciences Hefei 230001China State Key Laboratory of Plant Genomics Institute of Genetics and Developmental Biologythe Innovative Academy for Seed DesignChinese Academy of SciencesBeijing 100101China

Japonica/geng and indica/xian are two major rice(Oryza sativa)subspecies with multiple divergent traits,but how these traits are related and interact within each subspecies remains elusive.brassinosteroids(BRs)are a class of steroid phytohormones that modulate many important agronomic traits in rice.Here,using different physiological assays,we revealed that japonica rice exhibits an overall lower BR sensitivity than indica.Extensive screening of BR signaling genes led to the identification of a set of genes distributed throughout the primary BR signaling pathway with divergent polymorphisms.Among these,we demonstrate that the C38/T variant in BR Signaling Kinase2(OsBSK2),causing the amino acid change P13L,plays a central role in mediating differential BR signaling in japonica and indica rice.OsBSK2in indica plays a greater role in BR signaling than OsB SK2in japonica by affecting the auto-binding and protein accumulation of OsBSK2.Finally,we determined that OsBSK2 is involved in a number of divergent traits in japonica relative to indica rice,including grain shape,tiller number,cold adaptation,and nitrogen-use efficiency.Our study suggests that the natural variation in OsB SK2 plays a key role in the divergence of BR signaling,which underlies multiple divergent traits between japonica and indica.

关键词： brassinosteroid divergence grain shape natural variation rice

Crosstalk between brassinosteroid signaling and variable nutrient environments

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Science China(Life Sciences) 2023年第6期66卷 1231-1244页

作者： Guoxia Zhang Yongqiang Liu Qingjun Xie Hongning Tong Chengcai Chu Guangdong Laboratory for Lingnan Modern Agriculture State Key Laboratory for Conservation and Utilization of Subtropical Agro-BioresourcesCollege of AgricultureSouth China Agricultural UniversityGuangzhou510642China State Key Laboratory of Plant Genomics Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing100101China Key Laboratory for Enhancing Resource Use Efficiency of Crops in South China Ministry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou510642China National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing100081China

brassinosteroid(BR)represents a group of steroid hormones that regulate plant growth and development as well as environmental adaptation.The fluctuation of external nutrient elements is a situation that plants frequently face in the natural environment,in which nitrogen(N)and phosphorus(P)are two of the most critical nutrients restraint of the early growth of plants.As the macronutrients,N and P are highly required by plants,but their availability or solubility in the soil is relatively low.Since iron(Fe)and P always modulate each other’s content and function in plants mutually antagonistically,the regulatory mechanisms of Fe and P are inextricably linked.Recently,BR has emerged as a critical regulator in nutrient acquisition and phenotypic plasticity in response to the variable nutrient levels in Arabidopsis and rice.Here,we review the current understanding of the crosstalk between BR and the three major nutrients(N,P,and Fe),highlighting how nutrient signaling regulates BR synthesis and signaling to accommodate plant growth and development in Arabidopsis and rice.

关键词： brassinosteroid nitrogen phosphorus iron signaling foraging

brassinosteroid Signaling Recruits Histone 3 Lysine-27 Demethylation Activity to FLOWERING LOCUS C Chromatin to Inhibit the Floral Transition in Arabidopsis

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Molecular Plant 2018年第9期11卷 1135-1146页

作者： Zicong Li Yang Ou Zhicheng Zhang Jianming Li Yuehui He Shanghai Center for Plant Stress Biology & National Key Laboratory of Plant Molecular Genetics CAS Center for Excellence in Molecular Plant Sciences Chinese Academy of Sciences (CAS) Shanghai 201602 China University of Chinese Academy of Sciences Beijing 100049 China Shanghai Center for Plant Stress Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 201602 China These authors contributed equally to this article

The steroid hormone brassinosteroid （BR） plays a broad role in plant growth and development. As the retarded growth in BR-insensitive and BR-deficient mutants causes a strong delay in days to flowering, BR signaling has been thought to promote the floral transition inArabidopsis. In this study, using a developmental measure of flowering time, we show that BR signaling inhibits the floral transition and promotes vegetative growth in the Arabidopsis accessions Columbia and Enkheim-2. We found that BR signaling promotes the expression of the potent floral repressor FLOWERING LOCUS C （FLC） and three FLC homologs to inhibit flow- ering. In the presence of BR, the transcription factor BRASSINAZOLE-RESISTANT1 （BZR1）, together with BES1 -INTERACTING MYC-like proteins （BIMs）, specifically binds a BR- responsive element in the first intron of FLC and further recruits a histone 3 lysine 27 （H3K27） demethylase to downregulate levels of the repressive H3K27 trimethylation mark and thus antagonize Polycomb silencing at FLC, leading to its activation. Taken together, our findings demonstrate that BR signaling inhibits the floral transition inArabidopsis by a novel molecular mechanism in which BR signals are transduced into FLC activation and consequent floral repression.

关键词： brassinosteroid BR signaling flowering time BZR1 Polycomb silencing FLOWERING LOCUS C

brassinosteroid Signaling and Application in Rice

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Journal of Genetics and Genomics 2012年第1期39卷 3-9页

作者： Hongning Tong Chengcai Chu State Key Laboratory of Plant Genomics and Center for Plant Gene Research(Beijing) Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China

Combined approaches with genetics, biochemistry, and proteomics studies have greatly advanced our understanding of brassinosteroid （BR） signaling in Arabidopsis. However, in rice, a model plant of monocot and as well an important crop plant, BR signaling is not as well characterized as in Arabidopsis. Recent studies by forward and reverse genetics have identified a number of either conserved or specific components of rice BR signaling pathway, bringing new ideas into BR signaling regulation mechanisms. Genetic manipulation of BR level or BR sensitivity to improve rice yield has established the great significance of BR research achievements.

关键词： brassinosteroid BR signaling Rice Yield

brassinosteroid Enhances Jasmonate-Induced Anthocyanin Accumulation in Arabidopsis Seedlings

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Journal of Integrative Plant Biology 2011年第8期53卷 632-640页

作者： Zhihong Peng Chengyun Han Libing Yuan Kun Zhang Hongman Huang Chunmei Ren Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Utilization Hunan Agricultural University Changsha 410128 China College of Bioscience and Biotechnology Hunan Agricultural University Changsha 410128 China

Jasmonate （JA） regulates plant development, mediates defense responses, and induces anthocyanin biosynthesis as well. Previously, we isolated the psc1 mutant that partially suppressed coi1 insensitivity to JA, and found that brassinosteroid （BR） was involved in JA signaling and negatively regulated JA inhibition of root growth in Arabidopsis. In this study it was shown that JA-induced anthocyanin accumulation was reduced in BR mutants or in wild type treated with brassinazole, an inhibitor of BR biosynthesis, whereas it was induced by an application of exogenous BR. It was also shown that the‘late’anthocyanin biosynthesis genes including DFR, LDOX , and UF3GT, were induced slightly by JA in the BR mutants relative to wild type. Furthermore, the expression level of JA-induced Myb/bHLH transcription factors such as PAP1, PAP2, and GL3, which are components of the WD-repeat/Myb/bHLH transcriptional complexes that mediate the ‘late’ anthocyanin biosynthesis genes, was lower in the BR mutants than that in wild type. These results suggested that BR affects JA-induced anthocyanin accumulation by regulating the ‘late’ anthocyanin biosynthesis genes and this regulation might be mediated by the WD-repeat/Myb/bHLH transcriptional complexes.

关键词： biosynthesis brassinosteroid crosstalk signaling transcription.

Unraveling the Dynamic Integration of Auxin,brassinosteroid and Gibberellin in Early Shade-Induced Hypocotyl Elongation

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Phenomics 2022年第2期2卷 119-129页

作者： Sha Huang Chuanwei Yang Lin Li State Key Laboratory of Genetic Engineering Institute of Plant BiologySchool of Life SciencesFudan UniversityShanghai 200438People’s Republic of China

For shade-intolerant plants,a reduction in the red/far-red(R:FR)light ratio signals the close proximity of competitors and triggers shade-avoidance syndrome(SAS).Auxin,brassinosteroid,gibberellin and some transcriptional regulators have been reported to regulate shade-induced hypocotyl elongation.However,little is understood regarding the coordination of these multiple regulatory pathways.Here,combining time-lapse growth rates and transcriptomic data,we demonstrate that auxin and brassinosteroid affect two phases of shade-induced rapid growth,whereas gibberellin mainly contributes to the second rapid growth phase.PHYTOCHROME-INTERACTING FACTOR 7(PIF7)acts earlier than other PIFs.PIF4 and PIF5 modulate the second rapid growth phase.LONG HYPOCOTYL IN FAR-RED 1(HFR1)and PIF3-LIKE 1(PIL1)modulate two rapid growth phases.Our results reveal that hormonal and transcriptional regulatory programs act together to coordinate dynamic hypocotyl changes in an immediate response to a shade signal and provide a novel understanding of growth kinetics in a changing environment.

关键词： Shade avoidance syndrome Auxin brassinosteroid Gibberellin Hypocotyl Elongation

brassinosteroid-regulated plant growth and development and gene expression in soybean

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The Crop Journal 2019年第3期7卷 411-418页

作者： Wenchao Yin Nana Dong Mei Niu Xiaoxing Zhang Lulu Li Jun Liu Bin Liu Hongning Tong National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop Sciences Chinese Academy of Agricultural Sciences

brassinosteroids(BRs) are endogenous phytohormones that play important roles in regulating plant growth and development.In this study, we evaluated the effects of brassinolide(BL, one of the active BRs) on soybean and identified roles of the hormone in regulating multiple aspects of plant growth and development.BL application promoted hypocotyl and epicotyl elongation in the light but blocked epicotyl elongation in the dark.High levels of castasterone and BL accumulated in light-grown plants.BL disrupted shoot negative gravitropism, whereas gibberellin did not.BL delayed leaf senescence.Transcriptome analysis showed that BL induced cell wall-modifying genes and auxin-associated genes but suppressed a class of WRKY genes involved in senescence and stress responses,showing the complex roles of BRs in multiple biological processes.

关键词： Soybean brassinosteroid Senescence Gravitropism WRKY