The core G protein signaling module,which consists of Gαand extra-large Gα(XLG)subunits coupled with the Gβγdimer,is a master regulator of various stress responses.In this study,we compared the basal and salt stre...The core G protein signaling module,which consists of Gαand extra-large Gα(XLG)subunits coupled with the Gβγdimer,is a master regulator of various stress responses.In this study,we compared the basal and salt stress-induced transcriptomic,metabolomic and phenotypic profiles in Gα,Gβ,and XLG-null mutants of two plant species,Arabidopsis thaliana and Marchantia polymorpha,and showed that G protein mediates the shift of transcriptional and metabolic homeostasis to stress readiness status.We demonstrated that such stress readiness serves as an intrinsic protection mechanism against further stressors through enhancing the phenylpropanoid pathway and abscisic acid responses.Furthermore,WRKY transcription factors were identified as key intermediates of G protein-mediated homeostatic shifts.Statistical and mathematical model comparisons between A.thaliana and M.polymorpha revealed evolutionary conservation of transcriptional and metabolic networks over land plant evolution,whereas divergence has occurred in the function of plant-specific atypical XLG subunit.Taken together,our results indicate that the shifts in transcriptional and metabolic homeostasis at least partially act as the mechanisms of G protein-coupled stress responses that are conserved between two distantly related plants.展开更多
基金This study was supported by the Agency for Science,Technology and Research(A*STAR)Singapore under the Industry Alignment Fund Pre-positioning Program,the High Performance Precision Agriculture(HiPPA)system(A19E4a0101)the Singapore-MIT Aliance for Research and Technology,and Disruptive&Sustainable Technologies for Agricul-tural Precision(DISTAP)(to D.U.)a discovery grant from the Natural Sciences and Engineering Research Council of Canada(ARGPIN-2020-07097)(to K-LL)。
文摘The core G protein signaling module,which consists of Gαand extra-large Gα(XLG)subunits coupled with the Gβγdimer,is a master regulator of various stress responses.In this study,we compared the basal and salt stress-induced transcriptomic,metabolomic and phenotypic profiles in Gα,Gβ,and XLG-null mutants of two plant species,Arabidopsis thaliana and Marchantia polymorpha,and showed that G protein mediates the shift of transcriptional and metabolic homeostasis to stress readiness status.We demonstrated that such stress readiness serves as an intrinsic protection mechanism against further stressors through enhancing the phenylpropanoid pathway and abscisic acid responses.Furthermore,WRKY transcription factors were identified as key intermediates of G protein-mediated homeostatic shifts.Statistical and mathematical model comparisons between A.thaliana and M.polymorpha revealed evolutionary conservation of transcriptional and metabolic networks over land plant evolution,whereas divergence has occurred in the function of plant-specific atypical XLG subunit.Taken together,our results indicate that the shifts in transcriptional and metabolic homeostasis at least partially act as the mechanisms of G protein-coupled stress responses that are conserved between two distantly related plants.
