Involvement of Hydrogen Peroxide in the Regulation of Senescence in Pear 1
AUTOR(ES)
Brennan, Thomas
RESUMO
Endogenous peroxide levels in pear fruit (Pyrus communis) were measured using a titanium assay method, and were found to increase during senescence in both Bartlett and Bosc varieties. Application of glycolic acid or xanthine, serving as substrates for the formation of H2O2, increased the peroxide content of the tissue and accelerated the onset of ripening, as measured by increased softening and ethylene evolution. Application of ethylene also induced increased peroxide levels. Ripening processes were similarly promoted when peroxides were conserved by inhibiting the activity of catalase with hydroxylamine or potassium cyanide. By comparison, the inhibition of glycolate oxidase with alphahydroxy-2-pyridinemethanesulfonic acid decreased the peroxide content of the tissue and delayed the onset of ripening. These results indicate that the onset of ripening correlates with the peroxide content of fruit tissues as occurring under normal conditions or as influenced by the treatments. Hydrogen peroxide may be involved in oxidative processes required in the initiation and the promotion of ripening.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=542414Documentos Relacionados
- The Involvement of Hydrogen Peroxide in the Differentiation of Secondary Walls in Cotton Fibers1
- Involvement of Hydrogen Peroxide and Nitric Oxide in Expression of the Ipomoelin Gene from Sweet Potato1
- Some Physiological Changes Occurring during the Senescence of Auxin-Deprived Pear Cells in Culture 1
- Senescence-like growth arrest induced by hydrogen peroxide in human diploid fibroblast F65 cells.
- Coordinate regulation of Bacillus subtilis peroxide stress genes by hydrogen peroxide and metal ions.