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TLDR: Auxins are plant hormones that help with growth and development. They play a role in shaping the plant, from the cellular level to the overall organization of the plant. They help with cell elongation, root growth, fruit development, and flowering. Synthetic auxins are also used as herbicides.

Auxins are a class of plant hormones that help with the growth and development of plants. They have some characteristics similar to morphogens, which are substances that control the pattern of growth in organisms. Auxins are essential for the coordination of many growth and behavioral processes in plants and are crucial for plant body development.

There are different types of auxins, but the most abundant and potent one is called indole-3-acetic acid (IAA). It is present in all parts of the plant and helps create patterns of auxin concentration that guide the development of cells and the overall plant. Auxins work in concert with other plant hormones and their ratio determines whether roots or shoots will grow.

On a cellular level, auxins stimulate cell elongation by loosening cell walls, which allows the cells to grow larger. They also promote cell division and differentiation, contributing to the growth of tissues and organs. Auxins are transported throughout the plant body through a process called polar auxin transport, which helps create concentration maxima and minima of auxin in different parts of the plant.

Auxins have a significant impact on the overall organization of the plant. They help with the development of primary growth poles, the formation of buds, and the coordination of different organs like roots, cotyledons, and leaves. Auxins also play a role in apical dominance, where the growth of lateral buds is inhibited by the presence of auxin from the apical bud.

In addition to their role in growth and development, auxins also have effects on other processes in plants. They can delay the senescence of flowers, promote root initiation, and stimulate fruit growth. Synthetic auxins, such as 2,4-D and 2,4,5-T, are used as herbicides to control weed growth.

Overall, auxins are essential for the proper growth and development of plants. They help shape the plant, from the cellular level to the overall organization, and play a role in various processes like cell elongation, root growth, and fruit development.

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