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Word Count: 635
Senescent cells cannot divide but yet still remain metabolically active In humans the process of senescence may be the cause of aging that over time evolved to stop cancer the uncontrolled growth of cells In plants senescence starts from the moment they are harvested It is the start of the terminal phase in the life cycle of the plant the beginning of the end As you can see senescence has both positive and negative effects on living organisms Senescence is due to a gene called the lipase gene that is induced at the onset of senescence The gene itself does not do the actual job of senescence It encodes an enzyme that damages cellular membranes which leads to a loss of metabolic function and to tissue spoilage Cellular Membranes are very important to the life of a cell At only one-millionth of a millimeter thick it regulates what goes in and out of a cell The blue spots in each one of these pictures below represent the presence of senescent cells The top left is young tissue is unaffected by senescence The top right is sun burnt which also lacks senescence The bottom four are older cell tissues which are evident by the senescent cells located inside them represented by the blue spots Different types of trees are affected by senescence in different ways Annual biennial and some types of perennials experience monocarpic senescence In monocarpic senescence the entire plant dies after seed formation In herbaceous perennials senescence of all above ground plants parts is very common feature In order to produce new above ground structures for next season an underground storage organ remains dormant until the next season and then produces the structures the next season In temperate regions woody plants show a senescence pattern typical of deciduous trees All the leaves fall off in the fall because the meristems in the leaves become dormant In the
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