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receptor-like kinase OsCR4 controls leaf morphogenesis and embryogenesis by fixing the distribution of auxin in rice

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Journal of Genetics and Genomics 2020年第9期47卷 577-589页

作者： Jiao Wang Lin-Lin Yan Zhi-Liang Yue Hao-Yue Li Xiu-Jie Ji Cui-Xia Pu Ying Sun College of Life Science Hebei Normal UniversityHebei Key Laboratory of Molecular and Cellular BiologyKey Laboratory of Molecular and Cellular Biology of Ministry of EducationHebei Collaboration Innovation Center for Cell SignalingShijiazhuang050024China Institute of Cash Crops Hebei Academy of Agriculture&Forestry SciencesShijiazhuang050051China

Cell differentiation is a key event in organ development;it involves auxin gradient formation, cell signaling, and transcriptional regulation. Yet, how these processes are orchestrated during leaf morphogenesis is poorly understood. Here, we demonstrate an essential role for the receptor-like kinase Os CR4 in leaf development. oscr4 loss-of-function mutants displayed short shoots and roots, with tiny,crinkly, or even dead leaves. The delayed outgrowth of the first three leaves and seminal root in oscr4 was due to defects in plumule and radicle formation during embryogenesis. The deformed epidermal,mesophyll, and vascular tissues observed in oscr4 leaves arose at the postembryo stage;the corresponding expression pattern of pro Os CR4:GUS in embryos and young leaves suggests that Os CR4 functions in these tissues. Signals from the auxin reporter DR5 rev:VENUS were found to be altered in oscr4 embryos and disorganized in oscr4 leaves, in which indole-3-acetic acid accumulation was further revealed by immunofluorescence. Os WOX3 A, which is auxin responsive and related to leaf development,was activated extensively and ectopically in oscr4 leaves, partially accounting for the observed lack of cell differentiation. Our data suggest that Os CR4 plays a fundamental role in leaf morphogenesis and embryogenesis by fixing the distribution of auxin.

关键词： receptor-like kinase OsCR4 OsWOX3A Auxin distribution Leaf Embryo Rice

Splicing of receptor-like kinase-Encoding SNC4 and CERK1 is Regulated by Two Conserved Splicing Factors that Are Required for Plant Immunity

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Molecular Plant 2014年第12期7卷 1766-1775页

作者： Zhibin Zhang Yanan Liu Pingtao Ding Yan Li Qing Kong Yuelin Zhang Department of Botany University of British Columbia Vancouver Canada V6T 1Z4 National Institute of Biological Sciences Zhongguancun Life Science Park Beijing People's Republic of China 102206

Plant immune receptors belonging to the receptor-like kinase （RLK） family play important roles in the recog- nition of microbial pathogens and activation of downstream defense responses. The Arabidopsis mutant snc4-1D con- tains a gain-of-function mutation in the RLK SNC4 （SUPPRESSOR OF NPRI-1, CONSTITUTIVE4）, which leads to constitutive activation of defense responses. Analysis of suppressor mutants of snc4-1D identified two conserved splicing factors, SUA （SUPPRESSOR OF ABI3-5） and RSN2 （REQUIRED FOR SNC4-1D 2）, that are required for the constitutive defense responses in snc4-1D. In sua and rsn2 mutants, SNC4 splicing is altered and the amount of 5NC4 transcripts is reduced. Further analysis showed that SUA and RSN2 are also required for the proper splicing of CERK1 （CHITIN ELICITOR receptor kinase1）, which encodes another RLK that functions as a receptor for chitin. In sua and rsn2 mutants, induction of reactive oxygen species by chitin is reduced and the non-pathogenic bacteria Pseudomonas syringae pv. tomato DC3OOOhrcC grows to higher titers than in wild-type plants. Our study suggests that pre-mRNA splicing plays important roles in the regulation of plant immunity mediated by the RLKs SNC4 and CERK1.

关键词： plant immunity receptor-like kinase alternative splicing SUA RSN2 SNC4 CERK1.

Global Analysis of Expression Profiles of Rice receptor-like kinase Genes

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Molecular Plant 2012年第1期5卷 143-153页

作者： Lin-Lin Gao Hong-Wei Xue National Key Laboratory of Plant Molecular Genetics Institute of Plant Physiology and EcologyShanghai Institutes for Biological Science(SIBS)ChineseAcademy of Sciences300 Fenglin Road20032 ShanghaiChina

The receptor-like kinases （RLKs） play critical roles in plant development and response to stress stimuli. By perceiving or sensing the extracellular signals, RLK activates the downstream signaling pathway through phosphorylating the specific targets. Up to now, only a few RLKs have been functionally identified, which are even fewer in rice （Oryza sativa L.）. We here report the systemic analysis of the expression profiles of rice RLK coding genes in different tissues, with the emphasis on seed development and in response to both abiotic stress and plant hormones. The results showed that most rice RLK genes are expressed in two or more tissues, of which the RLCK-RLKs have a higher, while WAK- and SD-RLKs have a lower, expression level in the vegetative tissues than other subfamily members. Interestingly, the constitutively highly expressed RLKs in rice and Arabidopsis are conserved, which is consistent with the previous hypothesis that RLKs existed before the differentiation of monocotyledon and dicotyledon plants. Nearly one-third of the detected rice RLKs are expressed during seed development, and the RLCK-RLK members possess a higher percentage during the endosperm de- velopment, suggesting a novel function of RLCK-RLK members in endosperm development. Further analysis revealed that many RLK genes expressed during seed development are also regulated by abiotic stresses （cold, salt, or drought） or hor- mones, indicating that RLKs may take part in the stress-related signaling pathways such as dehydration of endosperm. These results provide informative insights into the RLK studies and will be helpful to reveal the global regulatory network controlling rice seed development.

关键词： receptor-like kinase rice profiling seed development stress ABA.

OsRLCK160 contributes to flavonoid accumulation and UV-B tolerance by regulating OsbZIP48 in rice

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Science China(Life Sciences) 2022年第7期65卷 1380-1394页

作者： Feng Zhang Jiacheng Huang Hao Guo Chenkun Yang Yufei Li Shuangqian Shen Chuansong Zhan Lianghuan Qu Xianqing Liu Shouchuang Wang Wei Chen Jie Luo National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research(Wuhan) Huazhong Agricultural UniversityWuhan 430070China College of Plant Science and Technology Huazhong Agricultural UniversityWuhan 430070China College of Tropical Crops Hainan UniversityHaikouHainan 570288China

Plants produce specialized metabolites to adapt to the ever-changing environments.Flavonoids are antioxidants essential for growth,development,and breeding with increased stress resistance in crops.However,the mechanism of the involvement of flavonoids in ultraviolet-B(UV-B)stress in rice(Oryza sativa)is largely unknown.In this study,we cloned and functionally identified a receptor-like kinase(OsRLCK160)and a bZIP transcription factor(OsbZIP48)positively regulating flavonoid accumulation through metabolite-based genome-wide association study of the flavonoid content in rice.Meanwhile,OsRLCK160 interacted with and phosphorylated OsbZIP48 to regulate the flavonoid accumulation and participate in UV-B tolerance in rice.Our study indicates the importance of applying OsRLCK160 and OsbZIP48 to advance the fundamental understanding of stable rice production and breed UV-B-tolerant rice varieties,which may contribute to breeding high-yield rice varieties.

关键词： flavonoids natural variation Oryza sativa receptor-like kinase transcription factor UV-B tolerance

Arabidopsis ROOT ELONGATION receptor kinaseS negatively regulate root growth putatively via altering cell wall remodeling gene expression

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Journal of Integrative Plant Biology 2022年第8期64卷 1502-1513页

作者： Yanze Wang Weiyue Chen Yang Ou Yingying Zhu Jia Li Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life SciencesLanzhou UniversityLanzhou 730000China State Key Laboratory of Grassland Agro‐Ecosystems Institute of Innovation EcologyLanzhou UniversityLanzhou 730000China Guangdong Provincial Key Laboratory of Plant Adaptation and Molecular Design School of Life SciencesGuangzhou UniversityGuangzhou 510006China

receptor-like kinases(RLKs)play key roles in regulating various physiological aspects in plant growth and development.In Arabidopsis thaliana,there are at least 223 leucine-rich repeat(LRR)RLKs.The functions of the majority of RLKs in the LRR XI subfamily were previously revealed.Only three RLKs were not characterized.Here we report that two independent triple mutants of these RLKs,named ROOT ELONGATION receptor kinaseS(REKs),exhibit increased cell numbers in the root apical meristem and enhanced cell size in the elongation and maturation zones.The promoter activities of a number of Quiescent Center marker genes are significantly up-regulated in the triple mutant.However,the promoter activities of several marker genes known to control root stem cell niche activities are not altered.RNA-seq analysis revealed that a number of cell wall remodeling genes are significantly up-regulated in the triple mutant.Our results suggest that these REKs play key roles in regulating root development likely via negatively regulating the expression of a number of key cell wall remodeling genes.

关键词： Arabidopsis thaliana cell expansion cell wall receptor-like kinase REK root

receptor-like kinases in Root Development:Current Progress and Future Directions

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Molecular Plant 2021年第1期14卷 166-185页

作者： Yang Ou Hong Kui Jia Li Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life SciencesLanzhou UniversityLanzhou 730000China

Cell-to-cell and cell-to-environment communications are critical to the growth and development of plants.Cell surface-localized receptor-like kinases(RLKs)are mainly involved in sensing various extracellular signals to initiate their corresponding cellular responses.As important vegetative organs for higher plants to adapt to a terrestrial living situation,roots play a critical role for the survival of plants.It has been demonstrated that RLKs control many biological processes during root growth and development.In this review,we summarize several key regulatory processes during Arabidopsis root developm ent in which RLKs play critical roles.We also put forward a number of relevant questions that are required to be explored in future studies.

关键词： receptor-like kinase root development Arabidopsis

Rapid responses:receptor-like kinases directly regulate the functions of membrane transport proteins in plants

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Journal of Integrative Plant Biology 2022年第7期64卷 1303-1309页

作者： Xiaopeng Li Jingjie Zhang Hongyong Shi Bo Li Jia Li Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life SciencesLanzhou UniversityLanzhou730000China Guangdong Provincial Key Laboratory of Plant Adaptation and Molecular Design School of Life SciencesGuangzhou UniversityGuangzhou 510006China

receptor-like kinases(RLKs)are a large group of plant-specific transmembrane proteins mainly acting as receptors or co-receptors of various extracellular signals.They usually turn extracellular signals into intracellular responses via altering gene expression profiles.However,recent studies confirmed that many RLKs can physically interact with diverse membrane-localized transport proteins and regulate their activities for speedy responses in limited tissues or cells.In this minireview,we highlight recent discoveries regarding how RLKs can work with membrane transport proteins collaboratively and thereby trigger cellular responses in a precise and rapid manner.It is anticipated that such regulation broadly presents in plants and more examples will be gradually revealed when in-depth analyses are conducted for the functions of RLKs.

关键词： channel pump receptor-like kinase signal trans-duction transporter

Arabidopsis U-box E3 ubiquitin ligase PUB11 negatively regulates drought tolerance by degrading the receptor-like protein kinases LRR1 and KIN7

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Journal of Integrative Plant Biology 2021年第3期63卷 494-509页

作者： Xuexue Chen Tingting Wang Amin Ur Rehman Yu Wang Junsheng Qi Zhen Li Chunpeng Song Baoshan Wang Shuhua Yang Zhizhong Gong State Key Laboratory of Plant Physiology and Biochemistry College of Biological SciencesChina Agricultural UniversityBeijing 100193China Collaborative Innovation Center of Crop Stress Biology Institute of Plant Stress BiologyHenan UniversityKaifeng 475001China Key Lab of Plant Stress Research College of Life ScienceShandong Normal UniversityJi'nan 250000China School of Life Sciences Institute of Life Science and Green DevelopmentHebei UniversityBaoding 100193China

Both plant receptor-like protein kinases(RLKs)and ubiquitin-mediated proteolysis play crucial roles in plant responses to drought stress.However,the mechanism by which E3 ubiquitin ligases modulate RLKs is poorly understood.In this study,we showed that Arabidopsis PLANT U-BOX PROTEIN 11(PUB11),an E3 ubiquitin ligase,negatively regulates abscisic acid(ABA)-mediated drought responses.PUB11 interacts with and ubiquitinates two receptor-like protein kinases,LEUCINE RICH REPEAT PROTEIN 1(LRR1)and kinase 7(KIN7),and mediates their degradation during plant responses to drought stress in vitro and in vivo.pub11 mutants were more tolerant,whereas Irr1 and kin7 mutants were more sensitive,to drought stress than the wild type.Genetic analyses show that the pub11 Irr1 kin7 triple mutant exhibited similar drought sensitivity as the Irr1 kin7 double mutant,placing PUB11 upstream of the two RLKs.Abscisic acid and drought treatment promoted the accumulation of PUB11,which likely accelerates LRR1 and KIN7 degradation.Together,our results reveal that PUB11 negatively regulates plant responses to drought stress by destabilizing the LRR1 and KIN7 RLKs.

关键词： abscisic acid drought response E3 ligase receptor-like kinase ubiquitination

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