Give an detail account on different types of senescence?

1.	Give an detail account on different types of senescence?
Answer» 1. Overall senescence: This kind of senescence occurs in annual plants when entire plant gets affected and dies. Example: Wheat and Soybean. It also occurs in few perennials also. Example: Agave and Bamboo. 2. Top senescence: It occurs in aerial parts of plants. It is common in perennials, underground and root system remains viable. Example: Banana and Gladiolus. 3. Deciduous senescence: It is common in deciduous plants and occurs only in leaves of plants, bulk of the stem and root system remains alive. Example: Elm and Maple. 4. Progressive senescence: This kind of senescence is gradual. First it occurs in old leaves followed by new leaves then stem and finally root system. It is common in annuals.

Answer»

1. Overall senescence: This kind of senescence occurs in annual plants when entire plant gets affected and dies.

Example: Wheat and Soybean. It also occurs in few perennials also.

Example: Agave and Bamboo.

2. Top senescence: It occurs in aerial parts of plants. It is common in perennials, underground and root system remains viable.

Example: Banana and Gladiolus.

3. Deciduous senescence: It is common in deciduous plants and occurs only in leaves of plants, bulk of the stem and root system remains alive.

Example: Elm and Maple.

4. Progressive senescence: This kind of senescence is gradual. First it occurs in old leaves followed by new leaves then stem and finally root system. It is common in annuals.

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