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The RLCK-VND6 module coordinates secondary cell wall formation and adaptive growth in rice

Molecular Plant 2023年第6期16卷 999-1015页

作者： Shaoxue Cao Yan Wang Yihong Gao Rui Xu Jianing Ma Zuopeng Xu Keke Shang-Guan Baocai Zhang Yihua Zhou State Key Laboratory of Plant Genomics Institute of Genetics and Developmental BiologyThe Innovative Academy of Seed DesignChinese Academy of SciencesBeijing100101China University of Chinese Academy of Sciences Beijing 100049China jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of the Ministry of Education for Plant Functional Genomics College of AgricultureYangzhouUniversityYangzhou225009China

The orderly deposition of secondary cell wall(SCW)in plants is implicated in various biological programs and is precisely *** many positive and negative regulators of SCW have been documented,the molecular mechanisms underlying SCW formation coordinated with distinct cellular physiological processes during plant adaptive growth remain largely ***,we report the identification of cellulose Synthase co-expressed Kinase1(CSK1),which encodes a receptor-like cytoplasmic kinase,as a negative regulator of SCW formation and its signaling cascade in *** deep sequencing of developing internodes and genome-wide co-expression assays revealed that CSK1 is co-expressed with cellulose synthase genes and is responsive to various stress *** increased SCW thickness and vigorous vessel transport in csk1 indicate that CSK1 functions as a negative regulator of SCW *** observation of green fluorescent protein-tagged CSK1 in rice protoplasts and stable transgenic plants,we found that CSK1 is localized in the nucleus and cytoplasm adjacent to the plasma *** and molecular assays demonstrated that CSK1 phosphorylates VASCULAR-RELATED NAC-DOMAIN 6(VND6),a master SCW-associated transcription factor,in the nucleus,which reduces the transcription of a suite of SCW-related genes,thereby attenuating SCW ***,genetic analyses show that CSK1 functions upstream of VND6 in regulating SCW ***,our physiological analyses revealed that CSK1 and VND6 are involved in abscisic acid-mediated regulation of cell growth and SCW *** together,these results indicate that the CSK1-VND6 module is an important component of the SCW biosynthesis machinery,which coordinates SCW accumulation and adaptive growth in *** study not only identifies a new regulator of SCW biosynthesis but also reveals a fine-tuned mechanism for precise control of SCW deposition,offering tools for rationally

关键词： RLCK signaling kinase fine-tuning regulator secondary cell wall biosynthesis mechanical force ABA adaptation

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