ISHS Acta Horticulturae 455: V International Mango Symposium
EFFECT OF THIOUREA ON TERMINAL BUD BREAK OF MANGO |
| Authors: | P. Tongumpai, S. Charnwichit, S. Srisuchon, S. Subhadrabandhu |
| Keywords: | dormancy, flower forcing, floral bud development, Mangifera indica L., mango, paclobutrazol, vegetative bud development |
| Abstract:
Three year old mango trees,Mangifera indica L., cv. Nam Dok Mai, were treated with thiourea to induce bud break. Thiourea at 0.5 and 1% were sprayed until run-off on the leaves of mango trees when the leaves were at full expansion. Treated trees produced uniform terminal bud breaks within 14 to 16 days after treatment, while the controls broke buds after 31 days. One percent thiourea induced severe defoliation. The phenology of the new shoots produced by all treatments were similar. To determine whether thiourea overcomes dormancy of mango buds, 3 year old mango trees, cv. Khiew Sawoey, were treated with 0.5% thiourea at the full leaf expanded state. The treated trees induced new shoot growth within 14 days. To induce flowering the trees were then drenched with 6g/tree of paclobutrazol and the trees were randomly divided into 7 groups and treated with 0.5% thiourea at either 45, 60, 75, 90, 105 or 120 days after paclobutrazol treatment. Bud break was low in the 45 to 75 days treatments, 100% vegetative in the 90 day treatment, 80% flowers in the 105 day treatment and 100% flowers in the 120 day treatment. This study suggests that flower initiation induced by paclobutrazol was completed after the 90 day paclobutrazol treatment. | |
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