Seed dormancy

Seed Dormancy
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Definition:
Non – germination of seeds due to absence of suitable conditions is termed as dormancy.

OR

A physical or physiological condition of viable seed, which prevents germination even in the presence of favorable conditions

The seed dormancy is divided in to three groups
1. Endogenous 2. Exogenous 3. Combined

Cause of seed dormancy/ factor responsible for seed dormancy

Genetical factor / cause:
1. Physiological 2. Embryo dormancy 3. Undeveloped cotyledon 4. Immature embryo

Coat imposed dormancy:
1. Seed coat factor:

a. Seed coat impermeable to water – i.e. water does not entered into seed coat b. Seed coat impermeable to oxygen (0 is not entered in seed coat) c. Mechanically resistant seed coat.

2. Embryo factor:

1. Dormant embryo 2. Immature/ Rudimentary embryo

3. Inhibitory factors:

Presence of germination Inhibitors in seeds i.e. presence of inhibitors or release of inhibitors.