Abstract
Summary Chlorophyll level in leaf discs of Datura stramonium declined sharply after excision, whilst discs which were infiltrated with distilled water maintained their chlorophyll content at the initial level ven after 10 d of incubation. Ethrel, a potent promoter of senescence, had no effect on the chlorophyll level of the discs infiltrated with distilled water. However, the protein content of control as well as infiltrated leaf discs doclined at about the same rate. It is concluded that chlorophyll degradation, widely accepted parameter of foliar senescence, may not be an inevitable part of aging phenomenon, and chlorophyll and protein breakdown are not inter-related processes.
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