CYSTM3 negatively regulates salt stress tolerance in Arabidopsis

We identified a novel mitochondrion-localized Cysteine-rich transmembrane module member CYSTM3 from Arabidopsis, which was ubiquitously expressed in different tissues and dramatically induced by salt stress

Yang Xu; Zipeng Yu; Shizhong Zhang; Changai Wu; Guodong Yang; Kang Yan; Chengchao Zheng; Jinguang Huang

2019

Scholarcy highlights

  • CYSTM3, a small mitochondrial protein, acts as a negative regulator in salt stress response by preventing Na+ efflux and disturbing reactive oxygen species homeostasis in Arabidopsis
  • We identified a novel mitochondrion-localized Cysteine-rich transmembrane module member CYSTM3 from Arabidopsis, which was ubiquitously expressed in different tissues and dramatically induced by salt stress
  • Transgenic plants overexpressing CYSTM3 displayed hypersensitivity to salt stress compared with wild type plants, whereas a knockout mutant cystm3 was more tolerant to high salinity than WT
  • Further analysis revealed that CYSTM3 could deter root Na+ efflux and inhibit the activities of a range of reactive oxygen species scavenging enzymes in Arabidopsis
  • The transcripts of nuclear salt stress-responsive genes were over-activated in cystm3 than those in WT and OE lines
  • Arabidopsis CYSTM3 acts as a negative regulator in salt stress tolerance

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