Short Communication: Growth patterns of Shorea leprosula and Dryobalanops lanceolata in Borneo’s forest managed with Selective Cutting with Line Replanting System

Tirkaamiana MT, Partasasmita R. Kamarubayana L. 2019. Growth patterns of Shorea leprosula and Dryobalanops lanceolata in Borneo’s forest managed with Selective Cutting with Line Replanting System. Biodiversitas 20: 1160-1165. Dryobalanops lanceolata is a species of plant in the family Dipterocarpaceae, which indigenous of Borneo. It is found in at least five protected areas (Kabilli-Sepilok Forest Reserve, Danum Valley Conservation Area, Ulu Temburong, Lambir, and Gunung Mulu National Parks), but is threatened elsewhere due to habitat loss. The demand for its timber is very high, so it requires conservation efforts while at the same time maintaining its productivity to meet the timber demand. One of the efforts to increase productivity of production forest in Indonesia is implementing Selective Logging with Line Replanting System (TPTJ). In this system superior species are planted in the planting lines. This study aimed to determine the growth of Shorea leprosula and Dryobalanops lanceolata planted in different planting line widths. Data of diameter increment of S. leprosula and D. lanceolata were obtained by observing 4 permanent sample plots (PUP) at concession areas of PT Balikpapan Forest Industries in Penajam Paser Utara, East Kalimantan, Indonesia. The results showed that the average diameter increment of S. leprosula and D. lanceolata at the planting line width of 3 meters was 1.47cm/yr and 0.74 cm/yr respectively, and at the planting line width of 6 meters was 2.08 cm/yr and 1.14 cm/yr respectively. The differences in planting line width had very significant effect on the growth and diameter increment of S. leprosula, presumably due to the increase of light intensity to optimal level which accelerates stomata opening and transpiration rate, thus affecting the rate of photosynthesis.

ANTIBACTERIAL AND CYTOTOXIC POTENCIES OF STILBENE OLIGOMERS FROM STEM BARKS OF BAOTI (DRYOBALANOPS LANCEOLATA) GROWING IN KENDARI, INDONESIA

Objective: The purpose of the research is to isolate and to identify compounds from stem barks of Dryobalanops lanceolata and to evaluate their activities toward bacteria and cancer cell lines.Methods: Isolation of the compounds worked with chromatography methods including thin-layer chromatography, vacuum liquid chromatography, and radial chromatography. All compound structures were determined based on the spectroscopic evidence including ultraviolet (UV), Infrared, and one-dimension and two-dimension nuclear magnetic resonance spectra and comparison the spectroscopy data with related data from references. The biological properties of compounds are evaluated toward bacteria Escherichia coli ATCC 35219 and Staphylococcus aureus ATCC 25923 and human breast cancer cell lines T-47D as cytotoxic potency.Results: Five stilbene oligomers have been isolated and identified from acetone extract of D. lanceolata stem barks namely balanocarpol (1), e-viniferin (2), a-viniferin (3), vaticanol B (4), and hopeaphenol (5). The inhibition zone value (in mm) of e-viniferin, balanocarpol, a-viniferin, hopeaphenol, and vaticanol B toward E. coli and S. aureus is 11±0.22 and 7±0.17, 9±0.17 and 13±0.12, 8±0.20 and 8±0.16, 6±0.16 and 8±0.11, and 5±0.12 and 4±0.14, respectively. Biological activity of the compounds against breast cancer cell lines T-47D (inhibitory concentration 50% in μM) for e-viniferin, balanocarpol, a-viniferin, hopeaphenol, and vaticanol B is 34.13±0.15, 98.17±0.41, 84.79±0.24, 52.04±0.26, and 119.30±0.54, respectively.Conclusions: e-viniferin is the most active compound toward E. coli and human breast cancer cell lines T-47D. Biological activity against bacteria S. aureus indicated that balanocarpol is the most potential compound.