ISHS Acta Horticulturae 665: II International Symposium on Lychee, Longan, Rambutan and other Sapindaceae Plants
EFFECTS OF POTASSIUM CHLORATE AND GIRDLING ON FLOWERING OF 'PHET SAKHON' LONGAN |
| Authors: | P. Charoensri, K. Jutamanee, J. Tawatpun, P. Tongumpai, K. Krisanapook |
| Keywords: | total nonstructural carbohydrate, flower induction, bud development, off-season fruit production, photoassimilates |
| Abstract:
The effects of potassium chlorate (KClO3) and trunk girdling on flowering and total nonstructural carbohydrate (TNC) in leaves and shoots of ‘Phet Sakhon’ longan were examined. KClO3 at the rate of 2 g.L-1 was sprayed on young leaves of 21 day-old and/or on mature leaves of 27 day-old longan trees. Girdling was applied to trunks of longan trees of the same leaf stages. Two weeks after the application of KClO3, a great number of young leaves emerged whereas girdling could induce only few young leaves. However, girdling was better than KClO3 for stimulating flowering. There was no difference in total nonstructural carbohydrate (TNC) contents in the leaves and shoots of all trees. This indicated that KClO3 and girdling played no influence on TNC. Microscopic examination of shoot tip tissues showed that flower buds appeared in week 4 after girdling which was earlier than when KClO3 was applied. The results of this study indicated that in ‘Phet Sakhon’ longan, girdling was more effective on flower induction and that there was no relationship between TNC and flowering. | |
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