I-Gibberellic Acid GA3 iyisilawuli sokukhula kwezitshalo esine-spectrum esisetshenziswa kakhulu ezihlahleni zezithelo. Kunomphumela wokusheshisa ukukhula nokukhula kwezitshalo kanye nokukhuthaza ukwelulwa kwamaseli. Ivame ukusetshenziselwa ukuheha i-parthenocarpy, ukugcina izimbali nezithelo.

Ihomoni yokukhula kwezitshalo wuhlobo lwesibulala-zinambuzane esisetshenziselwa ukulawula ukukhula nokuthuthuka kwezitshalo. Kuyinhlanganisela yokwenziwa enemiphumela yemvelo ye-hormone yezitshalo. Iwuchungechunge olukhethekile lwezibulala-zinambuzane. Ingakwazi ukulawula ukukhula nokuthuthukiswa kwezitshalo uma inani lokufaka isicelo lifanelekile

Njengamanje kunezigaba ezinhlanu ezaziwayo zama-phytohormones, okuyi-auxin, i-Gibberellic Acid GA3, i-Cytokinin, i-ethylene, ne-abscisic acid. Muva nje, i-brassinosteroids (BRs) kancane kancane iye yaqashelwa njengesigaba sesithupha esikhulu sama-phytohormones.

Ama-Brassinolides atholakala ngezigaba ezinhlanu zomkhiqizo:

(1)24-trisepibrassinolide: 72962-43-9 C28H48O6

(2)22,23,24-trisepibrassinolide :78821-42-9

( 3)28-epihomobrassinolide: 80843-89-2 C29H50O6

(4)28-homobrassinolide:82373-95-3 C29H50O6

(5)I-Brassinolide Yemvelo