What role do plant hormones play in plant life activities?

The main function of gibberellin is to promote cell elongation. It has little effect on promoting cell division and differentiation, in addition, it can promote parthenocarpy and fruit setting, and inhibit plant maturity and aging.

The main function of cytokinin is to promote cell division. In addition, it can eliminate apical dominance and induce bud differentiation.

These two hormones are related to plant growth, apical dominance and sexual movement.

The main function of abscisic acid is to induce the dormancy of plant organs, regulate the opening and closing of stomata, and promote the ripening of water-absorbing fruits in roots.

The main function of ethylene is to ripen fruits and promote organ shedding. In addition, it can also promote the release of dormancy of flowering roots of seed germination plants.

These two hormones are related to physiological phenomena such as dormancy of plant organs and senescence of plants.

Their interaction:

Antagonistic gibberellin can inhibit seed germination, abscisic acid can inhibit growth and cytokinin can alleviate it.

The above hormones and auxin also have synergistic antagonistic feedback alternation.

Auxin gibberellin promotes the elongation and growth of stems, and there is a feedback effect between ethylene and auxin (auxin promotes the synthesis of ethylene from ethylene to some extent, and then inhibits the synthesis and transportation of auxin)