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Abstract:

In a previous work we demonstrated that the suppression of blue light in shaded leaves of wheat increases their senescence rate and the development of oxidative stress symptoms. In order to better understand the interaction between the oxidative metabolism and light spectral quality in the regulation of leaf senescence, we studied the evolution of H2O2 concentration, protein oxidation, proteolytic activity and cytokinin content in excised leaves, either illuminated (control, "C") or shaded under blue ("B", high blue light transmission) or green ("G", very low blue light transmission) light filters. H2O2 concentration significantly increased during the first 9 h after treatment initiation, an effect that was consistently higher in treatments B and C. Leaves from these treatments showed lower chlorophyll and protein degradation rates, lower concentration of oxidized proteins, and maintained higher levels of the cytokinin isopentenyl-adenosine than those from treatment G. When moderate H2O2 concentrations were supplied during 6-9 h after the onset of the shade treatments, senescence rate in treatment G was delayed, while the opposite effect was observed in the presence of the H2O2 scavengers catalase and, to a lesser extent, dimethylthiourea. These effects were accompanied by an increment or a decrement, respectively, of catalase activity, suggesting that the early changes in H2O2 homeostasis in leaves from treatments B and C may contribute to the prevention rather than to the induction of further oxidative damage. Altogether our results show that the suppression of blue light transmission in shaded leaves act as a stress signal that increases their sensitivity to oxidative stress and accelerates cell death. © 2009 Elsevier Ireland Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Changes in hydrogen peroxide homeostasis and cytokinin levels contribute to the regulation of shade-induced senescence in wheat leaves
Autor:Causin, H.F.; Roberts, I.N.; Criado, M.V.; Gallego, S.M.; Pena, L.B.; Ríos, M.d.C.; Barneix, A.J.
Filiación:D.B.B.E., Facultad de Ciencias Exactas y Naturales, University of Buenos Aires, Ciudad Universitaria, 1428 C.A.B.A., Argentina
IBYF, CONICET, Facultad de Agronomía, Av. San Martín 4453, 1417 C.A.B.A., Argentina
CONICET, Cátedra de Química Biológica Vegetal, Dto. de Química Biológica, Junín 956, 1113 C.A.B.A., Argentina
CONICET, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, University of Buenos Aires, Ciudad Universitaria, 1428 C.A.B.A., Argentina
Palabras clave:Catalase; Hydrogen peroxide; Leaf senescence; Light spectral quality; Oxidative metabolism; Triticum aestivum; Triticum aestivum
Año:2009
Volumen:177
Número:6
Página de inicio:698
Página de fin:704
DOI: http://dx.doi.org/10.1016/j.plantsci.2009.08.014
Título revista:Plant Science
Título revista abreviado:Plant Sci.
ISSN:01689452
CODEN:PLSCE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01689452_v177_n6_p698_Causin

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Citas:

---------- APA ----------
Causin, H.F., Roberts, I.N., Criado, M.V., Gallego, S.M., Pena, L.B., Ríos, M.d.C. & Barneix, A.J. (2009) . Changes in hydrogen peroxide homeostasis and cytokinin levels contribute to the regulation of shade-induced senescence in wheat leaves. Plant Science, 177(6), 698-704.
http://dx.doi.org/10.1016/j.plantsci.2009.08.014
---------- CHICAGO ----------
Causin, H.F., Roberts, I.N., Criado, M.V., Gallego, S.M., Pena, L.B., Ríos, M.d.C., et al. "Changes in hydrogen peroxide homeostasis and cytokinin levels contribute to the regulation of shade-induced senescence in wheat leaves" . Plant Science 177, no. 6 (2009) : 698-704.
http://dx.doi.org/10.1016/j.plantsci.2009.08.014
---------- MLA ----------
Causin, H.F., Roberts, I.N., Criado, M.V., Gallego, S.M., Pena, L.B., Ríos, M.d.C., et al. "Changes in hydrogen peroxide homeostasis and cytokinin levels contribute to the regulation of shade-induced senescence in wheat leaves" . Plant Science, vol. 177, no. 6, 2009, pp. 698-704.
http://dx.doi.org/10.1016/j.plantsci.2009.08.014
---------- VANCOUVER ----------
Causin, H.F., Roberts, I.N., Criado, M.V., Gallego, S.M., Pena, L.B., Ríos, M.d.C., et al. Changes in hydrogen peroxide homeostasis and cytokinin levels contribute to the regulation of shade-induced senescence in wheat leaves. Plant Sci. 2009;177(6):698-704.
http://dx.doi.org/10.1016/j.plantsci.2009.08.014