The most obvious effect of auxin IAA (a synthetic representative is α-naphthaleneacetic acid) on plants is to promote cell growth, followed by strong nutrient transport.
The most prominent role of gibberellin GA3 (representative of 920) is to stimulate the elongation of the stem, significantly increase the height of the plant without changing the number of stems between the stems. Cytokinin CTK (a synthetic representative is kinetin) induces cell division, regulates its differentiation, promotes sprouting of buds, increases flowering rate, promotes fruit development, and delays plant senescence.
Abscisic acid ABA (currently no synthetic representative substance) inhibits plant growth. Ethylene ETH (synthetic representative is ethephon) promotes maturation.
Brassinolide BR (natural product represents Yingtianfeng) combines the combined efficacy of gibberellins, cytokinins, and auxin, multiple regulation, period of use, and crop diversity.
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