Indole-3-Acetic Acid Indole-3-acetic acid (IAA) is a plant hormone that regulates plant growth and development. Uses of IAA Seed and tuber germination: IAA helps seeds and tubers germinate. Root formation: IAA helps form lateral and adventitious roots. Flower and fruit development: IAA helps flowers and fruits develop. Xylem and shoot formation: IAA helps form xylem and shoots. Vegetative growth and photosynthesis: IAA helps with vegetative growth and photosynthesis. Environmental stress resistance: IAA helps plants resist environmental stressors.
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