Auxins are plant hormones. The most important auxin produced by plants is indole-3-acetic acid (IAA). 1  development of the embryo. 2  leaf formation. 3  phototropism. 4  gravitropism. 5  apical dominance. 6  fruit development. 7  abscission.8  root initiation and development.he most important auxin produced by plants is indole-3-acetic acid (IAA). 1  development of the embryo. 2  leaf formation. 3  phototropism. 4  gravitropism. 5  apical dominance. 6  fruit development. 7  abscission. 8  root initiation and development.
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