In order to elucidate the effects displayed by the plant growth regulators on the senecence of tobacco leaves, the author applied gibberellic acid, Kinetin, Indole-acetic acid, uracil, and malefic hydrazide to the excised leaves in concentration of 25㎎/ℓ of each regulators. And author obtained the results as following,
1. Parallel to the decreases of chlorophyll, the amounts of protein and RNA were decreased.
2. The supression of decrease of the amounts of RNA and protein was displayed by the plant growth regulators, G.A., I.A.A.. The decrease of them in M.A. treatments was more than in non-treatments.
3. The ratio changes of chlorophyll a/b and the changes of protein and RNA content seemed to be no relations.
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