A Phytochrome B-PIF4-MYC2/MYC4 module inhibits secondary cell wall thickening in response to shaded light

作     者：Fang Luo Qian Zhang Hu Xin Hongtao Liu Hongquan Yang Monika SDoblin Antony Bacic Laigeng Li 

作者机构：National Key Laboratory of Plant Molecular GeneticsCAS Center for Excellence in Molecular Plant SciencesChinese Academy of SciencesShanghai 200032China University of the Chinese Academy of SciencesBeijing 100049China Key Laboratory of Biodiversity Conservation in SouthwestState Forestry AdministrationSouthwest Forestry UniversityKunming 650224China College of Life and Environmental SciencesShanghai Normal UniversityShanghai 200234China La Trobe Institute for Agriculture and FoodSchool of AgricultureBiomedicine and EnvironmentDepartment of AnimalPlant and Soil SciencesAgriBioLa Trobe UniversityBundooraVIC 3086Australia Sino-Australia Plant Cell Wall Research CentreState Key Laboratory of Subtropical SilvicultureSchool of Forestry and BiotechnologyZhejiang A&F UniversityHangzhou 311300China 

出 版 物：《Plant Communications》 (植物通讯（英文）)

年 卷 期：2022年第3卷第6期

页      面：43-55页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 09[农学] 071007[理学-遗传学] 0901[农学-作物学] 090102[农学-作物遗传育种] 

基　　金：supported by the National Natural Science Foundation of China(grant no.32130072,31630014) the Chinese Academy of Sciences(grant no.XDB27020104) 

主　　题：far-red light fiber cell MYC2 secondary cell wall xylem 

摘      要：Secondary cell walls(SCWs)in stem cells provide mechanical strength and structural support for *** thickening varies under different light *** previous study revealed that blue light enhances SCW thickening through the redundant function of MYC2 and MYC4 directed by CRYPTOCHROME1(CRY1)signaling in fiber cells of the Arabidopsis inflorescence *** this study,we find that the Arabidopsis PHYTOCHROME B mutant phyB displays thinner SCWs in stem fibers,but thicker SCWs are deposited in the PHYTOCHROME INTERACTING FACTOR(PIF)quadruple mutant pif1pif3pif4pif5(pifq).The shaded light condition with a low ratio of red to far-red light inhibits stem SCW ***4 interacts with MYC2 and MYC4 to affect their localization in nuclei,and this interaction results in inhibition of the MYCs’transactivation activity on the NST1 *** evidence shows that regulation of SCW thickening by PIFs is dependent on MYC2/MYC4 ***,the results of this study reveal a PHYB-PIF4-MYC2/MYC4 module that inhibits SCW thickening in fiber cells of the Arabidopsis stem.