The Metabolism of Oat Leaves during Senescence: IV. The Effects of alphaalpha'-Dipyridyl and other Metal Chelators on Senescence |
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Authors: | Tetley R M Thimann K V |
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Affiliation: | The Thimann Laboratories, Division of Natural Sciences, University of California, Santa Cruz, California 95064. |
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Abstract: | The senescence of the first leaves of light-grown Avena seedlings when detached and placed in the dark is inhibited by α, α′-dipyridyl and α, α′, α″-tripyridyl at concentrations between 10−5 and 10−4 M. Five other chelating agents exert similar inhibiting effects at concentrations 3 to 30 times higher. The senescence of etiolated leaves, as shown by loss of carotenoid and protein, is similarly inhibited. Ethylene-diaminetetraacetate has a similar effect in the dark, though only at 10 mM and above, but in the light it causes bleaching of chlorophyll. It is deduced that an iron-containing system plays an essential part in the initiation of the senescence process. |
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