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D53： The Missing Link in Strigolactone Signaling

Molecular Plant 2014年第5期7卷 761-763页

作者： xiangpei kong maolin zhang zhaojun ding The Key Laboratory of Plant Cell Engineering and Germplasm Innovation College of Life Sciences Shandong University Jinan 250100 Shandong China

Strigolactones （SLs）, a group of small carotenoid-derived terpenoid lactones, have been recently identified as plant hormones controlling plant architecture through modulating shoot and root branching （Brewer et al., in the rhizosphere because of 2013）. SLs were first discovered their involvement in both symbiotic and parasitic interactions. Deficiencies in SL biosynthesis and perception lead to excessive growth of axillary bud, which is exemplified through various mutants such as max1, max2,

关键词： DEGRADATION PERCEPTION HORMONE DWARF14

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NAC1 regulates root ground tissue maturation by coordinating with the SCR/SHR-CYCD6;1 module in Arabidopsis

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Molecular Plant 2023年第4期16卷 709-725页

作者： Chuantian Xie Cuiling Li Fengxia Wang Feng zhang Jiajia Liu Junxia Wang Xiansheng zhang xiangpei kong zhaojun ding The Key Laboratory of Plant Development and Environmental Adaptation Biology Ministry of EducationCollege of Life SciencesShandong UniversityQingdao Shandong266237China National Key Laboratory of Crop Biology College of Life SciencesShandong Agricultural UniversityTaianShandong 271018China

Precise spatiotemporal control of the timing and extent of asymmetric cell divisions(AcDs)is essential for plant development.In the Arabidopsis root,ground tissue maturation involves an additional AcD of the endo-dermis that maintains the inner cell layer as the endodermis and generates the middle cortex to the outside.Through regulation of the cell cycle regulator CYCLIND6;1(CYCD6;1),the transcription factors SCARECROW(SCR)and SHORT-ROOT(SHR)play critical roles in this process.In the present study,we found that loss of function of NAC1,a NAC transcription factor family gene,causes markedly increased periclinal cell divisions in the root endodermis.Importantly,NAC1 directly represses the transcription of CYCD6;1 by recruiting the co-repressor TOPLESS(TPL),creating a fine-tuned mechanism to maintain proper root ground tissue patterning by limiting production of middle cortex cells.Biochemical and genetic analyses further showed that NAC1 physically interacts with SCR and SHR to restrict excessive periclinal cell divisions in the endo-dermis during root middle cortex formation.Although NAC1-TPL is recruited to the CYCD6;1 promoter and represses its transcription in an SCR-dependent manner,NAC1 and SHR antagonize each other to regu-late the expression of CYCD6;1.Collectively,our study provides mechanistic insights into how the NAC1-TPL module integrates with the master transcriptional regulators SCR and SHR to control root ground tissue patterning by fine-tuning spatiotemporal expression of CYCD6;1 in Arabidopsis.

关键词： root,NAC1,SCR,SHR,TOPLESS,CYCD6 1

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Initiation and maintenance of plant stem cells in root and shoot apical meristems

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aBIOTECH 2020年第3期1卷 194-204页

作者： Junxia Wang Yinghua Su xiangpei kong zhaojun ding Xian Sheng zhang The Key Laboratory of Plant Development and Environmental Adaptation Biology Ministry of EducationCollege of Life SciencesShandong UniversityQingdao 266237ShandongChina State Key Laboratory of Crop Biology College of Life SciencesShandong Agricultural UniversityTai’an 271018ShandongChina

Plant stem cells are a small group of cells with a self-renewal capacity and serve as a steady supply of precursor cells to form new differentiated tissues and organs in plants.Root stem cells and shoot stem cells,which are located in the root apical meristem and in the shoot apical meristem,respectively,play a critical role in plant longitudinal growth.These stem cells in shoot and root apical meristems remain as pluripotent state throughout the lifespan of the plant and control the growth and development of plants.The molecular mechanisms of initiation and maintenance of plant stem cells have been extensively investigated.In this review,we mainly discuss how the plant phytohormones,such as auxin and cytokinin,coordinate with the key transcription factors to regulate plant stem cell initiation and maintenance in root and shoot apical meristems.In addition,we highlight the common regulatory mechanisms of both root and shoot apical meristems.

关键词： Stem cell Initiation Maintenance Auxin Cytokinin Transcription factors

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柳暗花明:胞外生长素信号感受的新突破

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植物学报 2023年第6期58卷 861-865页

作者：孔祥培张蒙悦丁兆军山东大学生命科学学院植物发育与环境适应生物学教育部重点实验室青岛266237

生长素在植物生长发育过程中发挥重要作用,其信号转导机制一直是植物学领域关注的热点。前期研究表明,ABP1-TMK分子模块参与胞外生长素信号感受,但ABP1作为生长素受体备受争议。近期,福建农林大学徐通达团队和杨贞标团队鉴定到ABL蛋白... 详细信息

生长素在植物生长发育过程中发挥重要作用,其信号转导机制一直是植物学领域关注的热点。前期研究表明,ABP1-TMK分子模块参与胞外生长素信号感受,但ABP1作为生长素受体备受争议。近期,福建农林大学徐通达团队和杨贞标团队鉴定到ABL蛋白作为生长素结合蛋白参与胞外生长素信号感受。与传统的功能冗余不同,ABL和ABP1通过蛋白结构的相似性实现功能补偿效应,进而与TMK在细胞膜上形成复合体,作为胞外生长素的共受体介导生长素信号驱动的快速反应。该研究深入解析了胞外生长素信号感受的重要机制,是生长素研究领域的重大突破。

关键词：生长素生长素受体 ABL1 ABL2 ABP1 TMK

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