Changes in Ethylene and Total Nonstructural Carbohydrate Contents prior to Shooting of Longan, Lychee and Marian Plum

Abstract

Changes in ethylene and total nonstructural carbohydrate (TNC) were investigated in lychee cv. 'Hong Huay’, longan cv. ‘Dor’ and marian plum cv. ‘Toon Klaow’ . Ethylene concentrations in intercellular cells and changes of TNC at week 8^th, 6^th,4^th and 2^nd prior to shooting were measured. It revealed that ethylene concentrations in intercellular spaces of lychee and marian plum shoots decreased during week 8^th to 6^th before shooting, then increased until shooting occurred. Whereas in longan, the ethylene concentration remained constant during week 8^th to 4^th before shooting, then increased until shooting occurred.

TNC contents prior to shooting of lychee cv. 'Hong Huay' and longan cv. ‘Dor' tended to decrease from week 8^th before shooting until shooting occurred. However, TNC content in marian plum cv. ‘Toon Klaow’ decreased during 8 to 6 weeks before shooting, then it remained constant until shooting occurred.