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TGA factors promote plant root growth by modulating redox homeostasis or response

Journal of Integrative Plant Biology 2022年第8期64卷 1543-1559页

作者： Xiaochen Hu Liyun Yang Mengfei Ren Lin Liu Jing Fu Hongchang Cui State Key Laboratory of Crop Stress Biology for Arid Areas College of Life SciencesNorthwest A&F UniversityYangling 712100China Department of Biological Science Florida State UniversityTallahasseeFL 32306USA

To identify novel regulators of stem cell renewal,we mined an existing but little explored cell typespecific transcriptome dataset for the Arabidopsis root.A member of the TGA family of transcription factors,TGA8,was found to be specifically expressed in the quiescent center(QC).Mutation in TGA8 caused a subtle root growth phenotype,suggesting functional redundancy with other TGA members.Using a promoter::HGFP transgenic approach,we showed that all TGA factors were expressed in the root,albeit at different levels and with distinct spatial patterns.Mutant analyses revealed that all TGA factors examined contribute to root growth by promoting stem cell renewal,meristem activity,and cell elongation.Combining transcriptome analyses,histochemical assays,and physiological tests,we demonstrated that functional redundancy exists among members of cladesⅡandⅤor those in cladesⅠandⅢ.These two groups of TGA factors act differently,however,as their mutants responded to oxidative stress differently and quantitative reverse transcription polymerase chain reaction assays showed they regulate different sets of genes that are involved in redox homeostasis.Our study has thus uncovered a previously unrecognized broad role and a mechanistic explanation for TGA factors in root growth and development.

关键词： Arabidopsis thaliana quiescent center reactive oxygen species redox root apical meristem TGA family

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Receptor-like protein kinase-mediated signaling in controlling root meristem homeostasis

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aBIOTECH 2020年第3期1卷 157-168页

作者： Yafen Zhu Chong Hu Xiaoping Gou Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life SciencesLanzhou UniversityLanzhou 730000China

Generation of the root greatly benefits higher plants living on land.Continuous root growth and development are achieved by the root apical meristem,which acts as a reservoir of stem cells.The stem cells,on the one hand,constantly renew themselves through cell division.On the other hand,they differentiate into functional cells to form diverse tissues of the root.The balance between the maintenance and consumption of the root apical meristem is governed by cell-to-cell communications.Receptor-like protein kinases(RLKs),a group of signaling molecules localized on the cell surface,have been implicated in sensing multiple endogenous and environmental signals for plant development and stress adaptation.Over the past two decades,various RLKs and their ligands have been revealed to participate in regulating root meristem homeostasis.In this review,we focus on the recent studies about RLK-mediated signaling in regulating the maintenance and consumption of the root apical meristem.

关键词： Distal root meristem Peptides Proximal root meristem Receptor-like protein kinases root apical meristem Signal transduction

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Notes from the Underground:Receptor-Like Kinases in Arabidopsis root Development

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Journal of Integrative Plant Biology 2013年第12期55卷 1224-1237页

作者： Michael P.Wierzba Frans E.Tax Department of Molecular and Cellular Biology University of Arizona School of Plant Sciences University of Arizona

During plant development, the frequency and context of cell division must be controlled, and cells must differentiate properly to perform their mature functions. In addition, stem cell niches need to be maintained as a reservoir for new cells. All of these processes require intercellular signaling, whether it is a cell relaying its position to other cells, or more mature cells signaling to the stem cell niche to regulate the rate of growth. Receptor-like kinases have emerged as a major component in these diverse roles, especially within the Arabidopsis root. In this review, the functions of receptor-like kinase signaling in regulating Arabidopsis root development will be examined in theareas of root apical meristem maintenance, regulation of epidermal cell fate, lateral root development and vascular differentiation.

关键词： Lateral root development receptor-like kinases root apical meristem root epidermal patterning vascular development.

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Plant stem cells and their regulations in shoot apical meristems

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Frontiers in Biology 2010年第5期5卷 417-423页

作者： Chun-Ming LIU Yuxin HU Center for Signal Transduction&Metabolomics Key Laboratory of Photosynthesis and Environmental Molecular PhysiologyInstitute of BotanyChinese Academy of SciencesBeijing 100093China

Stem cells in plants,established during embry-ogenesis,are located in the centers of the shoot apical meristem(SAM)and the root apical meristem(RAM).Stem cells in SAM have a capacity to renew themselves and to produce new organs and tissues indeﬁnitely.Although fully differentiated organs such as leaves do not contain stem cells,cells in such organs do have the capacity to re-establish new stem cells,especially under the induction of phytohormones in vitro.Cytokinin and auxin are critical in creating position signals in the SAM to maintain the stem cell organizing center and to position the new organ primordia,respectively.This review addresses the distinct features of plant stem cells and focuses on how stem cell renewal and differentiation are regulated in SAMs.

关键词： plant stem cell shoot apical meristem root apical meristem

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