Physiology of senescence:

The procedure of senescence includes a number of structural and physiological modifications in the senescing organs.

Some of the significant changes are a follows:

a) Cells endure reduction in their size.

b) The membrane bound sub-cellular inclusions are disturbed.

c) Photosynthesis is decreased and starch content reduces in the cells.

d) Breakdown of chlorophyll is accompanied by the synthesis and accumulation of anthocyanin pigments.

e) Protein synthesis is reduced and protein break down improves.

f) Amino acids are withdrawn from the senescing leaves and transported to the growing areas.

g) RNA content is reduced.

h) The chromatin material modifies its property and DNA molecules degenerate.

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