Effect of Potassium Chlorate on Gibberellin-like Substance Contents in Leaves and Shoots of Air-layered Longan cv. Daw

Abstract

Gibberellin-like substance contents in leaves and shoots after treated with potassium chlorate were studied by using one year old air-layered with root and derooted longan cv. Daw. The completely randomized design was employed with four treatments, air-layered + tap water (R); air-layered + potassium chlorate (R+KClO₃); derooted air-layered + tap water (DR); derooted air-layered + potassium chlorate (DR+KClO₃), and four replications, ten trees per replication. The air-layered in all treatments were dipped into potassium chlorate (+KClO₃) solution at the concentration of 500 ppm or tap water for 24 hours then all of the air-layered longans were cultured in tap water throughout the study. They were found that the contents of gibberellin-like substances (GAs) in leaves and shoots of all treatments tended to be non-significant differences throughout the 25 days studied period. Contents of GAs in leaves and shoots within each treatment decreased as the studied time increased.