REPRODUCTIVE PHENOLOGY AND REPRODUCTIVE SUCCESS OF TEAK (TECTONA-GRANDIS L. F)

Three clones, with low, medium, and high fruit-production capacities w ere selected from a 10-yr-old clonal seed orchard (CSO). Reproductive phenology and reproductive success of the three clones were determined . The period of flowering-to-fruit maturation of teak in East Java is 6-8 mo. Flowering begins in mid-January, and fruit maturation occurs d uring the dry season from mid-May through September. The low fruit-pro duction capacity of clone 5 is related to early flowering, the interme diate fruit production capacity of clone 12 is related to late floweri ng, and the high fruit production capacity of clone 17 coincides with the peak CSO flowering period. The preemergent reproductive success (P ERS) was very low and varies among clones. The PERS of clone 5 (0.1%) was lower than that of clones 12 and 17 (0.4% and 0.5%, respectively). The major constraints in teak reproduction were low fruit- and seed-s et. The higher fruit-set in clone 17 (35.6 Fr/Infl) than in clones 12 and 5 (17.9 and 10.4 Fr/Infl, respectively) may be caused by a higher incidence of cross-pollination, since the flowering period of clone 17 coincided with the peak CSO flowering period. It is best to collect f ruits in August labour 24 wk after peak flowering) when germination ca pacity is highest (57.67%) and Abscisic acid and water content have de clined to about 0.84 mu g/g fw and 11%, respectively.