what is seed dormacy? explain in detail
Answers
Answer:
Seed dormancy is an evolutionary adaptation that prevents seeds from germinating during unsuitable ecological conditions that would typically lead to a low probability of seedling survival
Explanation:
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Answer:
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Explanation:
Seed dormancy is an evolutionary adaptation that prevents seeds from germinating during unsuitable ecological conditions that would typically lead to a low probability of seedling survival. Dormant seeds do not germinate in a specified period of time under a combination of environmental factors that are normally conducive to the germination of non-dormant seeds.
There are certain major causes for the seed dormancy. Listed below are the few reasons for the seed dormancy.
Light
Temperature
Hard Seed Coat
Period after ripening
Germination inhibitors
Immaturity of the seed embryo
Impermeability of seed coat to water
Impermeability of seed coat to oxygen
Mechanically resistant seed coat
Presence of high concentrate solutes
Types of Seed Dormancy
The seed dormancy is of following types:
Innate dormancy
It is the condition of seeds which is incapable of germination even if conditions suitable for seedling growth are supplied. This inability to germinate may be due in certain species to the embryo being immature at the time of dispersal.
Enforced dormancy
It is the condition of seeds which is incapable of germination due to an environmental restraint which includes, an adequate amount of moisture, oxygen, light and a suitable temperature.
Induced dormancy
This type of seed dormancy occurs when the seed has imbibed water, but has been placed under extremely unfavourable conditions for germination. Finally, seed fails to germinate even under more favourable conditions.
An important function of seed dormancy is delayed germination, which allows dispersal and prevents simultaneous germination of all seeds. The staggering of germination safeguards some seeds and seedlings from suffering damage or death from short periods of bad weather or from transient herbivores; it also allows some seeds to germinate when competition from other plants for light and water might be less intense. Another form of delayed seed germination is seed quiescence, which is different from true seed dormancy and occurs when a seed fails to germinate because the external environmental conditions are too dry or warm or cold for germination.
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