1.O lenei oloa o se laau endogenous auxin-inducing factor, lea e aofia ai le 5 ituaiga o laau auxins endogenous e aofia ai indoles ma 2 ituaiga o vitamini. Faʻatulagaina faʻatasi ma le faʻaopoopoga o mea faʻapitoa, e mafai ona faʻateleina le gaioiga o le endogenous auxin synthase i totonu o laʻau i se taimi puupuu ma faʻaosofia le tuʻufaʻatasia o le auxin endogenous ma faʻamatalaga o le gene, faʻateleina le faʻalauteleina o le vaevaega, faʻalauteleina ma le faʻalauteleina, faʻaosofia le faʻavaeina o rhizomes, ma e aoga i tuputupu aʻe fou aʻa ma vascularization faiga eseesega, faʻamalosia le faʻavaeina o aʻa faʻalauiloa o tipi.

INDOLE-3-BUTYRIC ACID POTASSIUM SALT (IBA-K) ose faʻatonuga o le tuputupu aʻe o laʻau e faʻamalosia ai le aʻa o fua. E masani ona faʻaaogaina e faʻaleleia ai le tuputupu aʻe o aʻa capillary fua. A tu'ufa'atasia ma le Naphthalene acetic acid (NAA), e mafai ona fai ma mea e maua'a ai. INDOLE-3-BUTYRIC ACID POTASSIUM SALT (IBA-K) e mafai ona faʻaaogaina mo le tipiina o le aʻa o fatu, faʻapea foʻi ma le faʻaopopoina o le fugalaʻau faʻamaʻi, faʻafefeteina faʻafefe ma isi oloa e faʻaleleia ai le aʻafia o fualaʻau ma faʻaleleia le fua o le ola o tipi.

O le faʻatonuina o le tuputupu aʻe e fa, Paclobutrazol, Uniconazole, Chlormequat Chloride, ma le Mepiquat chloride, e pulea uma le tuputupu aʻe o laau i se taimi puupuu e ala i le taofia o le faʻaogaina o le Gibberellic acid i totonu o laʻau. I

Paclobutrazole (Paclo) e faʻaaogaina i fualaʻau eseese e pei o araisa, saito, fualaau faisua, ma fualaau aina. Paclobutrazole (Paclo) ose la'au fa'asa'o fa'atupula'ia. E mafai ona faʻalavelaveina le tuʻufaʻatasia o gibberellins endogenous i totonu o laʻau ma faʻaitiitia le vaeluaina ma le faʻalauteleina o sela laau.