Changes in Ethylene Content in Stem Apex prior to Leaf Flushing of Lychee cv. Hong Huay and Marian Plum cv. Toon Klaow

Abstract

Changes in ethylene content in stem apexes prior to leaf flushing of lychee cv. Hong Huay were studied from August 1997 to April 1998. Using lychee trees at Songsan orchard, Doi-Pui, Muang district Chiang Mai, Thailand. Completely randomized design with 7 replications was employed. The treatment was the number of week i.e. 0,1,2,3 and 4 prior to leaf flushing. It was found that ethylene concentration in the intercellular space was low and constant between the 3^rd and the 4^th week before leaf flushing, then increased in the 2^nd and the 1^st week before leaf flushing and remained constant until when leaf flushing occurred. While changes in ethylene content in stem apexes prior to leaf flushing of marian plum cv. Toon klaow, using marian plum trees at Wang Nam Kang orchard, Mae-Wang district, Chiang Mai, Thailand, from July 1997 to October 1998. Completely randomized design with 10 replications was employed. It was found that there was low and constant of ethylene concentration in the intercellular space of marian plum shoot between the 4^th  to the 1^st week before leaf flushing but it increased when leaf flushing occurred