Programmed Senescence
Programmed senscence seems to be heavily influenced by plant hormones. The hormones abscisic acid and ethylene are accepted by most scientists as the main causes, but at least one source believes gibberellins and brassinosteroids are equally responsible. Cytokinins help to maintain the plant cell but when they are withdrawn or if the cell can not receive the cytokinin it may then undergo apoptosis or senescence.
Read more about this topic: Plant Senescence
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