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Question
Which of the following hormones regulate stomatal colour :
Which of the following hormones regulate stomatal colour :
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Solution
The correct option is C ABA
ABA is a stress hormone and is inhibitory in function. In response to drought or stress conditions, plants synthesize the phytohormone abscisic acid (ABA) that induces stomatal closure, thereby reducing transpirational water loss. It has been shown that ABA is de-novo synthesized from C40 carotenoids and has also been proposed to be rapidly released from its inactive conjugate, ABA glucose ester (ABA-GE). Through complex signaling mechanisms ABA triggers efflux of anions and potassium via guard cell plasma membrane ion channels, resulting in decrease of turgor pressure in guard cells and stomatal closure.So, the correct option is 'ABA'.
ABA is a stress hormone and is inhibitory in function. In response to drought or stress conditions, plants synthesize the phytohormone abscisic acid (ABA) that induces stomatal closure, thereby reducing transpirational water loss. It has been shown that ABA is de-novo synthesized from C40 carotenoids and has also been proposed to be rapidly released from its inactive conjugate, ABA glucose ester (ABA-GE). Through complex signaling mechanisms ABA triggers efflux of anions and potassium via guard cell plasma membrane ion channels, resulting in decrease of turgor pressure in guard cells and stomatal closure.
So, the correct option is 'ABA'.
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