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Stress-induced changes in polyamine and tyramine levels can regulate proline accumulation in tomato leaf discs treated with sodium chloride

Aziz, A ; Martin-Tanguy, J. (Rennes Univ. (France)) ; Larher, F

Physiologia plantarum, 1998-10, Vol.104 (2), p.195-202 [Periódico revisado por pares]

Copenhagen: Munksgaard International Publishers

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  • Título:
    Stress-induced changes in polyamine and tyramine levels can regulate proline accumulation in tomato leaf discs treated with sodium chloride
  • Autor: Aziz, A ; Martin-Tanguy, J. (Rennes Univ. (France)) ; Larher, F
  • Assuntos: Agronomy. Soil science and plant productions ; Biological and medical sciences ; CHLORURE DE SODIUM ; CLORURO SODICO ; Economic plant physiology ; ESTRES ; FEUILLE ; Fundamental and applied biological sciences. Psychology ; HOJAS ; LEAVES ; LYCOPERSICON ESCULENTUM ; Plant physiology and development ; POLIAMINAS ; POLYAMINE ; POLYAMINES ; PROLINA ; PROLINE ; PUTRESCINA ; PUTRESCINE ; SALINIDAD ; SALINITE ; SALINITY ; salt stress ; SODIUM CHLORIDE ; STRESS ; TIRAMINA ; TYRAMINE ; Water and solutes. Absorption, translocation and permeability ; Water relations, transpiration, stomata
  • É parte de: Physiologia plantarum, 1998-10, Vol.104 (2), p.195-202
  • Notas: F60
    1999000263
    ark:/67375/WNG-9S14T1R9-S
    istex:E6BF84E5F517F8D168613EC4C2D1E8D919F244C5
    ArticleID:PPL1040207
  • Descrição: The effect of salt stress on proline (Pro) accumulation and its relationship with the changes occurring at the level of polyamine (PA) metabolism and tyramine were investigated in leaf discs of tomato (Lycopersicon esculentum). The rate of accumulation of Pro, PA and tyramine was higher in the salt‐sensitive than in the salt‐tolerant cultivar. In the salt‐sensitive cultivar, Pro started to accumulate 4 h after the onset of the NaCl treatment, its maximum level being reached 27 h later. The lag phase was associated with a rapid decrease in putrescine (Put) and spermidine (Spd) and some increase in 1,3‐diaminopropane (Dap), a product of Spd and/or spermine (Spm) oxidation. This was followed by an increase in agmatine (Agm), cadaverine (Cad), Spm and tyramine. α‐DL‐difluoromethylarginine (DFMA), an inhibitor of arginine decarboxylase (ADC, EC 4.1.1.19), induced a decrease in the Put level in both control and stressed discs, while α‐DL‐difluoromethylomithine (DFMO), an inhibitor of ornithine decarboxylase (ODC, EC 4.1.1.17), caused a decrease in Spd and Spm levels only in salinized discs. These data suggest that ADC is operating under both control and stress conditions, whereas ODC activity is promoted only in response to salt stress. DFMA also depressed the salt‐induced Pro accumulation while DFMO did not inhibit this response. In salt‐stressed leaf discs, the decrease in Spd level in response to methylglyoxal‐bis‐(guanylhydrazone) (MGBG) or cyclohexylammonium (CHA) treatment suggests that salt stress did not block SAM decarboxylase or Spd synthase activities. However, the increased level of Dap reflected a salt stress‐promoted oxidation of PA. CHA and MGBG had no effect on Pro accumulation. Putrescine, Dap and especially tyramine supplied at low concentrations stimulated the Pro response which was, however, suppressed by application of Spm. Treatment with aminoguanidine, an inhibitor of diamine oxidases, also strongly inhibited Pro accumulation. These data suggest that salt‐induced Pro accumulation in tomato leaf discs is closely related to changes in their PA metabolism, either via substrate‐product relationships or regulatory effects at target(s) which remain to be characterized.
  • Editor: Copenhagen: Munksgaard International Publishers
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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