PLANT PHYSIOLOGY
PLANT GROWTH
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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IBA
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NAA
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ABA
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Zeatin
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Detailed explanation-1: -Abscisic acid (ABA) is a plant hormone that regulates numerous aspects of plant growth, development, and stress responses. ABA-deficient mutants from various plant species display reduced seed dormancy and wilty phenotypes, highlighting that these crucial ABA functions are conserved in the plant kingdom.
Detailed explanation-2: -Embryonic ABA plays a central role in induction and maintenance of seed dormancy and also inhibits the transition from embryonic to germination growth. Therefore, the ABA metabolism must be highly regulated at both temporal and spatial levels during phase of dessication tolerance.
Detailed explanation-3: -Therefore, ABA generally plays an inhibitory role in breaking dormancy in axillary buds [147].
Detailed explanation-4: -Abscisic acid (ABA) reversibly arrests embryo development at the brink of radicle growth initiation, inhibiting the water uptake which accompanies embryo growth. Seeds which have been kept dormant by ABA for several days will, after removal of the hormone, rapidly take up water and continue the germination process.
Detailed explanation-5: -Abscisic Acid/Gibberellin Balance Controls Seed Dormancy and Germination in Cereals.