HORTICULTURE SCIENCE
PLANT BIOLOGY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Abscisic acid
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Auxin
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Cytokinin
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Ethylene
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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: -Among these, abscisic acid (ABA), is the best-known stress hormone that closes the stomata, although other phytohormones, such as jasmonic acid, brassinosteroids, cytokinins, or ethylene are also involved in the stomatal response to stresses.
Detailed explanation-3: -Abscisic acid (ABA) is an important phytohormone regulating plant growth, development, and stress responses.
Detailed explanation-4: -Abscisic acid (ABA) is the sole plant hormone known to maintain seed dormancy; it acts through a gene expression network involving the transcription factor ABSCISIC ACID INSENSITIVE 3 (ABI3).
Detailed explanation-5: -Abscisic acid (ABA) is a stress hormone that accumulates under different abiotic and biotic stresses. A typical effect of ABA on leaves is to reduce transpirational water loss by closing stomata and parallelly defend against microbes by restricting their entry through stomatal pores.