Effects of Potassium Chlorate on Cytokinin-like Substance Contents in Leaf and Shoot During Flower Bud Induction of Air-layered Longan cv. Daw

Abstract

Effects of potassium chlorate on cytokinin-like substance contents in leaves and shoots during flower bud induction of derooted air-layered longan cv. Daw were studied by using two years old air-layered longan. 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 longans 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. The flower buds were investigated under light microscope on the 25 DAT in R+KClO₃ and DR+KClO₃ while R and DR did not developed any flower buds.  Contents of cytokinin-like substances (CKs) in leaves and shoots of all treatments tended to be non-significant differences throughout the 25 days studied period. The contents of CKs in leaves and shoots within each treatment decreased as the studied time increased.