Auxin A plant hormone - Christian eriksson

The most natural auxin is indoleacetic acid. It moves only from tip to base and is therefore uses polar transport. As it is a acid, it can rapidly alter gene expressions and induce the production of proteins. Plays a large role in phyllotaxy as Auxin can determine how large and where the leaves are going to grow.

Auxin's main function is to stimulate cell elongation and does this through ABP1. ABP1 is responsible for the membrane transport processes (such as transporting H+ across the membrane) and if Auxin boosts ABP1, then the membrane can allow more nutrients to pass through the cell which eventually leads to the cell elongation. Interestingly enough, too much auxin inhibits cell elongation as it inhibits cytokinins.

The same goes for roots as well. Auxin, in small amounts, will increase the initiation of roots. In large amounts, it enhances adventitious root formations which will often lead to positive effects such as sturdier support in larger trees.

Auxin helps in phototropism. Sides that are unable to absorb light produce auxin to help stimulate the growth so the plant can absorb as much sunlight as possible.

The Regulation of fruits - Little is understood of how auxin impacts the regulation of fruit, but it is know that it impacts the ripening, abscission, and growth of the fruit. Spraying auxins on a fruit will also increase the amount of seeds it produces.

Apical Dominance in Plants Through Auxin - Auxin allows the plant to grow with apical dominance (more of the central branch is growing than the side). This allows the plants to fulfill different niches while allowing it to access more light. Without auxin, we would not have trees such as oaks.

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