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Articles

Regulation of Senescence in Bean Leaf Discs by Light and Chemical Growth Regulators ¹

Department of Botany, University of California, Berkeley, California 94720

The senescence of excised discs of primary leaves of Phaseolus vulgaris, L., var. Red Kidney was followed by measuring the net breakdown of protein and chlorophyll. The chemical growth regulators indoleacetic acid, 2,4-dichlorophenoxy-acetic acid, gibberellic acid, kinetin, and 6-benzylaminopurine were relatively ineffective in retarding senescence in this tissue. White light, on the other hand, was very effective in senescence retardation. The response to light did not have the characteristics of a low energy (phytochrome) response and was blocked by concentrations of 3-(3,4-dichlorophenyl)-1, 1-dimethylurea which inhibited photosynthesis in the leaf discs. The light-induced retardation of senescence was concluded to be dependent on photosynthesis.

¹ This work was partially supported by NSF grant GB-6066.