Changes of Growth and Inflorescence Initiation by Exogenous Gibberellic Acid3 and 6-Benzylaminopurine Application in Phalaenopsis Orchids

This study was conducted to observe the effects of exogenous gibberellic acid3 (GA3) and 6-benzylaminopurine (BAP) treatments on growth inflorescence initiation Phalaenopsis determine whether hormonal applications can substitute for low-temperature exposure floral transition. Queen Beer ‘Mantefon’ clones were treated with no hormones (control), GA3 100 mg/L, 200 BAP mg/L + by foliar spray. The carried at 28 °C vegetative 20 forcing, respectively. At temperature, all did not induce initiation, but lateral shoots observed in BAP-treated plants even though this plant is a monopodial orchid. significantly increased leaf length decreased width, consequently length:width (L:W) ratio compared control alone. trend grew as concentration increased. Also, stem diameter. forcing L:W responded similarly treatments, size smaller than or accelerated emergence numbers, whereas slightly delayed emergence. promoted new development condition. These results indicated that cytokinin associated break axillary meristems spray improve Phalaenopsis. Although application exposure, it showed possibility promoting initiation.