Plant Physiology 56:140-142 (1975)
© 1975 American Society of Plant Biologists
Articles
The Metabolism of Oat Leaves during Senescence
IV. The Effects of  '-Dipyridyl and other Metal Chelators on Senescence 1
Richard M. Tetley2 and
Kenneth V. Thimann
a The Thimann Laboratories, Division of Natural Sciences, University of California, Santa Cruz, California 95064
The senescence of the first leaves of light-grown Avena seedlings when detached and placed in the dark is inhibited by , '-dipyridyl and , ', ''-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.
2 Present address: Department of Botany, University of Michigan, Ann Arbor, Mich. 48106.
1 Supported in part by National Science Foundation Grant GB 11867.
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