Molecular characterization of salt-stress-associated protein in citrus: protein and cDNA sequence homology to mammalian glutathione peroxidases

Plant Mol Biol. 1993 Mar;21(5):923-7. doi: 10.1007/BF00027124.


A gene encoding for a citrus salt-stress-associated protein (Cit-SAP) was cloned from Citrus sinensis salt-treated cell suspension. The gene, designated csa, was isolated from a cDNA expression library. The partial amino acid sequence of the protein, as well as that deduced from the nucleotide sequence of csa, revealed a considerable homology to mammalian glutathione peroxidase (GP), and to clone 6P229 from tobacco protoplasts. The increased expression of Cit-SAP in NaCl-treated cultured citrus cells and in citrus plants irrigated with saline water, and its similarity to GP, raise the possibility that one of the effects of salt stress in plants may be the increase of the level of free radicals.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Citrus / chemistry*
  • Glutathione Peroxidase / chemistry*
  • Molecular Sequence Data
  • Plant Proteins / chemistry*
  • Plant Proteins / genetics
  • Sequence Homology, Amino Acid


  • CSA protein, Citrus sinensis
  • Plant Proteins
  • Glutathione Peroxidase

Associated data

  • GENBANK/X66377