Ethylene and Abscisic acid
Channel: Trick Teacher
Date: 2020-08-12

Hi friends, welcome back to another video tutorial from trick teacher.
Today in this session we are teaching you about pgrs such as ethyline and abscisic acid,
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NOTES ON THIS TOPIC:-
Ethylene

Ethylene is a simple gaseous plant growth regulator synthesized by tissues undergoing senescence and ripening fruits.
Influences of ethylene on plants include horizontal growth of seedlings, swelling of the axis and apical hook formation in dicot seedlings.
Ethylene promotes senescence and abscission of plant organs, fruit ripening, enhances the respiration rate during ripening of the fruits
The rise in rate of respiration is called respiratory climactic.
Ethylene breaks seed and bud dormancy, initiates germination in peanut seeds, sprouting of potato tubers, promotes rapid internode/petiole elongation in deep water rice plants.
Ethylene also promotes root growth and root hair formation, thus helping the plants to increase their absorption surface.
The most widely used compound as source of ethylene is ethephon, which hastens fruit ripening and accelerates abscission in flowers and fruits and promotes female flowers in cucumbers.
Abscisic acid

Abscisic acid (ABA) was discovered for its role in regulating abscission and dormancy.
ABA inhibits seed germination, stimulates the closure of stomata, promote seed development, maturation and dormancy.
ABA increases the tolerance of plants to various kinds of stresses, that is why it is also called the stress hormone.
ABA acts as an antagonist to gibberellins.


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