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3. Auxin is an important plant hormone that regulates gene expression in response to stimuli. What...

3. Auxin is an important plant hormone that regulates gene expression in response to stimuli. What type of molecule is auxin and how does it regulate gene expression?

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Answer #1

Auxin is a plant growth hormone produced by the plants. They play a crucial role in carrying
out many plant processes. They have a wide variety of functions.
They promote cell growth, phototropism and also aid in supressing lateral growth.

The effect of auxin is mediated by auxin response factors(ARFs). These ARF proteins are
repressed by Aux/IAA proteins by sequestration in the cytoplasm. When auxin is present,
SCF complex is activated and it degrades Aux/IAA proteins there by relieving ARF proteins
from repression. Now ARF proteins are free to translocate into the nuclues and exert
their effects on gene expression.

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