Unformatted text preview: Senescence Senescence is the orderly, age-induced breakdown of cells and their components, leading to the decline and ultimate death of a plant or plant part. The timing of senescence is species-specific and varies among the organs of individual plants. Some species of plants produce short-lived flowers whose petals last for only a few hours before shriveling and dropping off, while the leaves of deciduous plants last through long growing seasons before senescing. Senescence is a metabolic process; therefore, it requires energy. It is not simply the ending of growth. Leaves, for example, move the products of photosynthesis—and their own structural substances—out of leaf tissue into stem and root tissue during senescence and before their vascular connections are severed at abscission. One of the first materials to degrade is the energy-converting connections are severed at abscission....
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.
- Fall '08