Changes in Cytokinin and Gibberellin-like Substances in Stem Apex of Lychee cv. Hong Huay Prior to Flowering
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Abstract
Changes in cytokinin and gibberellin-like substances in stem apex of lychee cv. Hong Huay prior to flowering were studied on 20-year-old trees grown in the Suan Song Sand orchard, Doipui, Chiang Mai, Thailand. Studying on cytokinin-like substances was carried out between December, 1995 and November, 1996 and the studied on gibberellin-like substances was carried out between December, 1997 and October, 1998. Completely Randomized Design was employed. The treatment was number of weeks prior to flowering; 0, 2, 4, 6 and 8 weeks for cytokinin and 0, 1, 2, 3 and 4 weeks for gibberellin.
The results revealed that the quantity of cytokinin-like substances was low at eight weeks prior to flowering and remained constant until six weeks prior to flowering, by which flower initiation took place. Thereafter, the increment was found at four weeks and rose up to maximum at two weeks prior to flowering then remained constant until flower emergence. Whereas, the quantity of gibberellin-like substances was higher at four and three weeks and decreased at two weeks prior to flowering by which flower initiation was found. After that it decreased from one week prior to flowering to minimum level at flower emergence.
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