Rapid climate change has led to enhanced soil salinity,one of the major determinants of land degradation,resulting in low agricultural productivity.This has a strong negative impact on food security and environmental ...Rapid climate change has led to enhanced soil salinity,one of the major determinants of land degradation,resulting in low agricultural productivity.This has a strong negative impact on food security and environmental sustainability.Plants display various physiological,developmental,and cellular responses to deal with salt stress.Recent studies have highlighted the root cap as the primary stress sensor and revealed its crucial role in halotropism.The root cap covers the primary root meristem and is the first cell type to sense and respond to soil salinity,relaying the signal to neighboring cell types.However,it remains unclear how root-cap cells perceive salt stress and contribute to the salt-stress response.Here,we performed a root-cap cell-specific proteomics study to identify changes in the proteome caused by salt stress.The study revealed a very specific salt-stress response pattern in root-cap cells compared with non-rootcap cells and identified several novel proteins unique to the root cap.Root-cap-specific protein–protein interaction(PPI)networks derived by superimposing proteomics data onto known global PPI networks revealed that the endoplasmic reticulum(ER)stress pathway is specifically activated in root-cap cells upon salt stress.Importantly,we identified root-cap-specific jacalin-associated lectins(JALs)expressed in response to salt stress.A JAL10-GFP fusion protein was shown to be localized to the ER.Analysis of jal10 mutants indicated a role for JAL10 in regulating the ER stress pathway in response to salt.Taken together,our findings highlight the participation of specific root-cap proteins in salt-stress response pathways.Furthermore,root-cap-specific JAL proteins and their role in the salt-mediated ER stress pathway open a new avenue for exploring tolerance mechanisms and devising better strategies to increase plant salinity tolerance and enhance agricultural productivity.展开更多
基金supported by IISER Tirupati and by an Early Career Research award from the Science and Engineering Research Board,Department of Science and Technology,Govt.of India(ECR/2016/001071)to E.R.K.K.D.acknowledges the CSIR-JRF fellowship and Bi-nationally supervised doctoral degree scholarship from DAAD(91730390)for her PhD.A.M.and A.P.G.acknowledge funding from IISER Tirupati for graduate studies.S.C.acknowledges funding from IISER Tirupati and the Ramalingaswami Re-entry Fellowship(BT/RLF/Re-entry/05/2018)Department of Biotechnology,Government of India.
文摘Rapid climate change has led to enhanced soil salinity,one of the major determinants of land degradation,resulting in low agricultural productivity.This has a strong negative impact on food security and environmental sustainability.Plants display various physiological,developmental,and cellular responses to deal with salt stress.Recent studies have highlighted the root cap as the primary stress sensor and revealed its crucial role in halotropism.The root cap covers the primary root meristem and is the first cell type to sense and respond to soil salinity,relaying the signal to neighboring cell types.However,it remains unclear how root-cap cells perceive salt stress and contribute to the salt-stress response.Here,we performed a root-cap cell-specific proteomics study to identify changes in the proteome caused by salt stress.The study revealed a very specific salt-stress response pattern in root-cap cells compared with non-rootcap cells and identified several novel proteins unique to the root cap.Root-cap-specific protein–protein interaction(PPI)networks derived by superimposing proteomics data onto known global PPI networks revealed that the endoplasmic reticulum(ER)stress pathway is specifically activated in root-cap cells upon salt stress.Importantly,we identified root-cap-specific jacalin-associated lectins(JALs)expressed in response to salt stress.A JAL10-GFP fusion protein was shown to be localized to the ER.Analysis of jal10 mutants indicated a role for JAL10 in regulating the ER stress pathway in response to salt.Taken together,our findings highlight the participation of specific root-cap proteins in salt-stress response pathways.Furthermore,root-cap-specific JAL proteins and their role in the salt-mediated ER stress pathway open a new avenue for exploring tolerance mechanisms and devising better strategies to increase plant salinity tolerance and enhance agricultural productivity.
