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Integrative Multi-omics Analyses of Barley Rootzones under Salinity Stress Reveal Two Distinctive Salt Tolerance Mechanisms

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Plant communications 2020年第3期1卷 107-123页

作者： William Wing Ho Ho camilla B.Hill Monika S.Doblin megan c.shelden Allison van de Meene Thusitha Rupasinghe Antony Bacic Ute Roessner School of BioSciences The University of MelbourneParkvilleVIC 3010Australia School of Veterinary and Life Sciences Murdoch UniversityMurdochWA 6150Australia La Trobe Institute for Agriculture&Food Department of AnimalPlant and Soil ScienceLa Trobe UniversityBundooraVIC 3086Australia ARc centre of Excellence in Plant Energy Biology School of AgricultureFood and WineUniversity of AdelaideGlen OsmondSA 5064Australia Metabolomics Australia The University of MelbourneParkvilleVIC 3010Australia

The mechanisms underlying rootzone-localized responses to salinity during early stages of barley development remain *** this study,we performed the analyses of multi-root-omes(transcriptomes,metabolomes,and lipidomes)of a domesticated barley cultivar(clipper)and a landrace(Sahara)that maintain and restrict seedling root growth under salt stress,*** generalized linear models were designed to determine differentially expressed genes(DEGs)and abundant metabolites(DAMs)specific to salt treatments,genotypes,or rootzones(meristematic Z1,elongation Z2,and maturation Z3).Based on pathway over-representation of the DEGs and DAMs,phenylpropanoid biosynthesis is the most statistically enriched biological pathway among all salinity responses *** with histological evidence,an intense salt-induced lignin impregnation was found only at stelic cell wall of clipper Z2,compared with a unique elevation of suberin deposition across Sahara *** suggests two differential salt-induced modulations of apoplastic flow between the *** on the global correlation network of the DEGs and DAMs,callose deposition that potentially adjusted symplastic flow in roots was almost independent of salinity in rootzones of clipper,and was markedly decreased in *** together,we propose two distinctive salt tolerance mechanisms in clipper(growth-sustaining)and Sahara(salt-shielding),providing important clues for improving crop plasticity to cope with deteriorating global soil salinization.

关键词： barley root transcriptomics metabolomics lipidomics omics integration salinity stress

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