PLANT PHYSIOLOGY
PLANT GROWTH
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Absisic acid = Promote root growth
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Ethylene = Fruit maturation
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Auxin = Inhibit seed germination
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Cytokinin = Drought tolerance
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Detailed explanation-1: -Abscisic acid (ABA) and ethylene are the major regulators of ripening and senescence in both dry and fleshy fruits, as demonstrated by numerous ripening-defective mutants, effects of exogenous hormone application, and transcriptome analyses.
Detailed explanation-2: -Ethylene is regarded as a multifunctional phytohormone that regulates both growth, and senescence. It promotes or inhibits growth and senescence processes depending on its concentration, timing of application, and the plant species.
Detailed explanation-3: -Ethylene stimulates the biosynthesis of auxin that is transported toward the root tip. Subsequently, basipetally transported auxin activates the local auxin response that is regulated by the auxin receptor (TIR1) and AUX/IAA (AXR2/IAA7 and AXR3/IAA17) and inhibits the cell elongation.
Detailed explanation-4: -Ethylene affects fruit-ripening. Normally, when the seeds are mature, ethylene production increases and builds-up within the fruit, resulting in a climacteric event just before seed dispersal.