Please write some statements regarding the role of auxin in hydrotropism and how it regulates hydrotropism in the plants.
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Answer:
Auxin is a plant growth-promoting hormone involved in all the mechanisms related to plant growth. Mainly three tropisms that are crucial for overall plant growth have been analyzed, which include phototropism (movement towards light), hydrotropism (movement towards moisture), and gravitropism (movement towards gravity). Interestingly, auxin plays an integral role in all three tropisms. In the case of hydrotropism, auxin accumulates the lower side of the roots (near root cap) in response to moisture and sends signals to the elongation part of the root to increase the root cell growth, resulting in the development of deeper roots to obtain the moisture or water.
In the case of phototropism, in response to light, auxin accumulates more at the shadow side of the stem and then induces cell division and growth. Due to this lop-sided growth (overgrowth at shadow side) stem bends towards a light to obtain more light in order to increase the rate of photosynthesis.