3-Indoleacetic acid bụ ụdị osisi auxin. Auxin nwere ọtụtụ nsonaazụ gbasara ahụike, nke metụtara njikọ ya. Obere ntinye nwere ike ịkwalite uto, na ịta ahụhụ dị elu ga-egbochi uto ọbụna igbu osisi. Mmetụta a na-egbochi mmadụ metụtara ma ọ nwere ike ime ka e guzobe ethylene. A na-egosipụta mmetụta ahụike nke auxin na ọkwa abụọ. Na ọkwa cellular, auxin nwere ike kpalite nkewa nke mkpụrụ ndụ cambium; kpalite elongation nke alaka ma gbochie uto nke sel mgbọrọgwụ; na-akwalite ọdịiche nke mkpụrụ ndụ xylem na phloem, na-akwalite mgbọrọgwụ mgbọrọgwụ, ma na-achịkwa morphology nke callus. N’akuku ahihia na ahihia osisi dum, auxin na aru oru site na igba nkpuru rue nkpuru osisi. Auxin na-achịkwa igbochi ọkụ na-acha uhie uhie nke hypocotyl elongation na seedlings; mgbe ọ na-enyefe ya na ala nke ome, ọ na-emepụta geotropism alaka; mgbe ọ na-enyefe ya na azụ azụ nke ome, ọ na-emepụta phototropism alaka; 3-Indoleacetic acid na-akpata uru apical ma na-egbu oge ahihia. Auxin na-akwalite ifuru, na-ebute mkpụrụ osisi parthenocarpic, na-egbu oge ntozu mkpụrụ.