Effect of polyamines on stabilization of molecular complexes in thylakoid membranes of osmotically stressed oat leaves

Monocotyledonous leaves subjected to osmotica used for protoplast isolation accumulate a massive amount of putrescine, lose chlorophyll and senesce rapidly

R.T. Besford

2004

Key concepts

Scholarcy highlights

  • Monocotyledonous leaves subjected to osmotica used for protoplast isolation accumulate a massive amount of putrescine, lose chlorophyll and senesce rapidly
  • High protein levels were maintained in thylakoid membranes of leaf tissue incubated in the dark in the presence of 0.6 M sorbitol when pretreated with DFMA
  • Applications of Spd, Spm or Dap were effective in retarding the loss of D1, D2 and cytochrome f from the thylakoid membranes as well as Rubisco large subunits and chlorophyll from the leaf tissue
  • The effects of polyamine applications may be mediated through Dap since most of the added Spd or Spm was converted to Dap within 6 h
  • The possible mechanisms of action of polyamine applications and DFMA-pretreatment on stabilizing the composition of the thylakoid membrane are discussed

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