Senescence Retarding Effect of Metal Ions: Pigment and Protein Contents and Photochemical Activities of Detached Primary Leaves of Wheat |
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Authors: | Subhan D. Murthy S.D.S. |
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Affiliation: | (1) Department of Biochemistry, S.V.University, Tirupati, 517502, India |
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Abstract: | Al3+ significantly delayed the loss of chlorophyll (Chl), protein, and carotenoids when compared to K+ and Mg2+ during dark-induced senescence of detached primary leaves of Triticum aestivum. Thylakoid membranes isolated from Al3+ - treated leaves showed a better retention of photosystem (PS) 2, PS1, and whole chain electron transport activities than thylakoids of K+- or Mg2+-treated leaves. These ions protected the electron transport activities and restored the DCMU-dependent fluorescence increase of thylakoid membranes in a valency-dependent manner. Al3+ also delayed the change of excitation energy distribution during senescence. |
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Keywords: | aluminium carotenoids chlorophyll DCMU electron transport fluorescence emission spectra leaf senescence magnesium potassium |
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