Changes in Quantity of Gibberellin-like Substances in Stem Apex prior to Flowering of Marian Plum (<I>Bouea burmanica</I> Griff.) cv. Toon Kloaw

Abstract

The study on changes in gibberellin-like substances in stem apex prior to flowering of marian plum (Bouea burmanica Griff.) cv. ‘Toon Kloaw’ was done by Rice Secondary Leaf Sheath Bioassay (RSLSB) during September 1998 to January 2000 at the Horticulture Department, Faculty of Agriculture, Chiang Mai University, Chiang Mai, Thailand. Completely Randomized Design was set with 11 replications. The treatment was number of weeks 2,4,6, and 8 prior to flowering. It was found that quantity of gibberellin-like substances tended to decrease gradually during 8 to 2 weeks before flowering from 0.0028800 to 0.006038 μgGA3 (Kyowa) equi.g f.wt.