3-Indoleacetic acid ndi mtundu wa chomera. Auxin ili ndi zovuta zambiri zakuthupi, zomwe zimakhudzana ndi kuchuluka kwake. Kutsika pang'ono kumatha kulimbikitsa kukula, ndipo kuchuluka kwambiri kumalepheretsa kukula ngakhale kupha mbewu. Izi zimalepheretsa kupangika kwa ethylene. Zotsatira zakubadwa kwa auxin zimawonetsedwa pamagawo awiri. Pamlingo wama cell, auxin imatha kuyambitsa magawano am'magazi a cambium; Zimakulitsa kutalika kwa nthambi ndikuletsa kukula kwa mizu; Limbikitsani kusiyanitsa kwa ma xylem ndi ma phloem cell, kulimbikitsa cuttings muzu, ndikuwongolera morphology ya callus. Pamalo am'mimba ndi mbewu zonse, auxin imagwira ntchito kuyambira mmera mpaka kucha zipatso. Auxin imayang'anira kuletsa kosintha kwa kuwala kofiira kwa michere ya hypocotyl; ikasunthira kumunsi kwa mphukira, imapanga ma geotropism a nthambi; ikasunthira kumbuyo kwa mphukira, imapanga phototropism yama nthambi; 3-Indoleacetic acid imapangitsa kuti apical apindule komanso amachepetsa kuchepa kwa tsamba. Auxin imalimbikitsa maluwa, imathandizira kukula kwa zipatso za parthenocarpic, ndikuchepetsa kukhwima kwa zipatso.