Abstract
The senescence of excised leaves of Oryza sativa Var. BBS 873 was followed by measuring the net breakdown of chlorophyll and protein with respect to the time of detachment. Kinetin was relatively ineffective but benzimidazole was effective in retarding the senescence. Red light was also effective in senescence retardation but on the other hand, far-red light speeded the senescence. Benzimidazole was the most effective treatment under red light in retarding leaf senescence. The red light induced retardation and the far-red enhancement of senescence is suggested to be under phytochrome control and dependent on photosynthesis.
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