Inflnences of Uncoupling Agents and other Metabolic Inhibitors on the Extension of Lamina Joints in Rice Plants

[摘要] Influences of uncoupling agents and other metabolic inhibitors on the extension of lamina joints are shown in this experiment. Leaf segments excised from the rice plants, according to the method described earlier(16, 19), constituted the experimental materials. The substances to be tested were added to the control medium containing 2 × 10-5 M of indoleacetic acid or l0-5 M of 2, 4-D. The stimulatory effect of the tested substances by the addition of indoleacetic acid at 2 × 10-6 M was investigated. From the obtained data the following facts are indicated. (1) Among the tested substances a noticeable inhibitive action was demonstrated by 1 mg/l of azalomycin F, 10 mg/l of colistin sulfate, 5 × 10-6 M of acriflavin, 5 × 10-6 M of pentaclorophenol, 10-5 M of methyl caffeate, 5 × 10-5 M of dinitro-o-cresol, 5 × 10-5 M of dinitrophenol, 10-4 M of diphenylamine, 5 × 10-4 M of sodium azide, 10-3 M of cinnamic acid, 10-^3 M of p-coumaric acid, 10-3 M of ferulic acid, 10-3 M of phenylurethane, and 10-3 M of vanillic acid. Also, 1 mg/l of 5-nitroso-7-phenoxytropolone, 10-5 M of z-furane, 5 × 10-5 M of methylene blue or 5 × 10-5 M of tannic acid could account for the slightly inhibitive effect on the extension. (2) The inhibition of extension of the excised lamina joints initiated at the concentration which is to influence the oxidative phosphorylation in plant mitocondria or to occur an increment of oxygen uptake in the plants. This result shows that the extension of lamina joint might be associated with the oxidative phosphorylation in the cells.

[学科分类] 农业科学（综合）