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BIOTROPIA - The Southeast Asian Journal of Tropical Biology
Published by Southeast Asian Regional Centre for Tropical Biology
ISSN : 02156334     EISSN : 1907770X     DOI : http://dx.doi.org/10.11598/btb
Core Subject : Health, Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary
BIOTROPIA, The Southeast Asian Journal of Tropical Biology, is a scientific publication of the Southeast Asian Ministers of Education Organization (SEAMEO) – Southeast Asian Regional Center for Tropical Biology (BIOTROP). It publishes articles in the broad areas of tropical ecosystems and environmental impacts, biodiversity conservation and sustainable development and biotechnology.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 6 Documents
 1 
Search results for , issue "No. 5 (1992)" : 6 Documents clear
EFFECT OF LIGHT QUALITIES AND STORAGE PERIODS ON THE GERMINATION OF PENNISETUM POLYSTACHION SEEDS*) S TJITROSEMITO
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 5 (1992)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (305.613 KB) | DOI: 10.11598/btb.1992.0.5.199

Abstract

Seeds  of  the  yellowish  inflorescence  strain  of  Pennisetum polystachion,  collected  from  the  field  in Indonesia, were kept  in the dark  for 30 days,  then germinated  in 12-h  light and 24-h  light under various  light qualities, namely, white, black, blue, red and far-red. There was no effect of photo-period to seed germination. Percent of seed germination under white, red, far-red, blue and dark were 49, 43, 22, 11 and 2%, respectively. White and red light did not cause any difference to seed germination. Seeds kept in 12-h light alternating with 12-h dark and 24-h dark for 15 and 30 days were tested for germination. Results  showed  that  light  condition during  seed  storage did not  effect  seed germination.  Long storage period resulted in more seed germination. During seed germination test, effect of light played a great role on increasing seed germination.
HISTOPATHOLOGY OF THE TELENCEPHALON AND DIENCEPHALON OF T1LAPIA NILOTICA EXPOSED TO SUBLETHAL DOSE OF MALATHION S-[1,2-DI-(ETHOXYCARBONYL ETHYL) DIMETHYL PHOSPHOROTHIOLOTHIONATE] EDNA A AMPARADO
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 5 (1992)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (753.705 KB) | DOI: 10.11598/btb.1992.0.5.195

Abstract

A  35-day  exposure  of  Tilapia  nilotica  embryos  to  sublethal  doses  of  3.0  ppm  and  0.3  ppm malathion,  S-[l,2-di-(ethoxycarbonyl  ethyl)  dimethyl  phosphorothiolothionate],  commercial  grade,  EC  57, produces cellular and ultrastructure changes in the brain. A number of nuclear centers of the treated animals are markedly larger than those of the control. Aberrant features observed in day-45 embryos are the neoplastic masses and increased vascularization. Ultrastructure defects include the presence of nuclear blebs, cytoplasmic vacuolations and increased lysosomal bodies.
EFFECTS OF CARBOFURAN ON THE REPRODUCTIVE CAPACITY OF A FRESHWATER SNAIL, RADIX QUADRASI, UNDER LABORATORY CONDITIONS VIRGINIA S CARING
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 5 (1992)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1177.472 KB) | DOI: 10.11598/btb.1992.0.5.197

Abstract

The  effects  of  4  sublethal  concentrations  of  carbofuran  (250,  500,  1000  and  2000  ppm)  on  the reproductive  capacity of R. quadrasi was determined. Results showed  that  incubation period  is delayed  and inhibited by 1000 and 2000 ppm carbofuran but not by lower concentrations. The hatching period is longer in treated snails and not  all  eggs hatch  in  the 1000 and 2000  ppm  treatment. The  percentage  of hatching  is inversely proportional to the carbofuran concentration. Oviposition  was  delayed  in  all  the  treated  stages  and  at  all  dosages.  The  higher  the  carbofuran concentration,  the  later  the onset of oviposition. The  reproductive period  is shortened. Fecundity was decreased in snails treated at EMB and SM. However, only the 2000 ppm carbofuran concentration showed an adverse effect on the snails exposure at PSM.
THE PERFORMANCE OF UPLAND RICE ESTABLISHED ON ALANG-ALANG DOMINATED AREA AFTER VARIOUS TECHNIQUES OF ALANG-ALANG CONTROL S TJITROSEMITO
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 5 (1992)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (96.085 KB) | DOI: 10.11598/btb.1992.0.5.198

Abstract

Pot experiment to investigate the performance of upland rice in a previously alang-alang dominated area was conducted under greenhouse condition at BIOTROP, Bogor, Indonesia from November 1986 to May 1989. The treatments were  factorially  combined,  replicated  5  times  and  randomized  completely.  The  first  factor  was alang-alang  control  consisting  of  5 different  techniques,  i.e.  (1)  glyphosate  applied  at  2.2  kg  a.e./ha;  (2) imazapyr applied at 1.5 kg a.e./ha; (3) dalapon applied twice at 7.4 + 7.4 kg a.i./ha; (4) slashing followed by soil cultivation; (5) slashing of alang-alang only; while the second factor was nitrogen fertilizer at 4 different levels, i.e. (1) 0 kg N/ha, (2) 60 kg N/ha, (3) 120 kg N/ha given twice, 60 kg N/ha at planting time and 60 kg N/ha at 38 dap, (4) 180 kg N/ha given twice, 90 kg N/ha at planting and 90 kg N/ha at 38 dap. Plant height (cm), tiller number/pot, productive tiller (%), panicle length (cm), spikelets/panicle, empty spikelet (%), weight 1000 grains (g) and grain yield (ton/ha) were observed. Upland rice grown with zero tillage technique using glyphosate (2.2 kg a.i./ha) or dalapon (14.8 kg a.i./ha) performed as good as or even better than manual cultivation. Imazapyr at 1.5 kg a.e./ha was phytotoxic to rice planted 1 month after spraying. The application of N fertilizer lower than 60 kg N/ha was not sufficient, but more than 60 kg N/ha was too high; it stimulated the production of too many tillers, with high percentage of unproductive tillers and empty grains.
ANTIOXIDANT METABOLISM IN WATER STRESSED PEANUT TREATED WITH DINICONAZOLE G C RIVERO
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 5 (1992)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.1992.0.5.196

Abstract

The response of alpha-tocopherol, glutathione and ascorbate was studied in peanut (Arachis hypogea L., cv. NC-17)  subjected  to water  stress  and  treated with  a  triazole  fungicide,  diniconazole  (DINI).  There was  no significant  difference  in  alpha-tocopherol  levels  between  control  and DINI  treated  plants. However,  a  14% increase was observed in alpha-tocopherol level in DINI treated, water stressed plants compared to water stressed plants. Total glutathione  in DINI  treated  stressed plants  increased by 13  and  31% over  control and water stressed plants, respectively. Ascorbate levels decreased significantly in all treatments compared to the control. These results indicate that DINI alleviates the oxidative damage caused by water stress by increasing total glutathione levels. However, DINI does not seem to affect alpha-tocopherol and ascorbate levels in peanuts under water stress.
PRODUCTION STRUCTURE OF MAIN COMMERCIAL TREE SPECIES IN A MANGROVE FOREST IN EAST SUMATERA, INDONESIA CECEP KUSMANA
BIOTROPIA - The Southeast Asian Journal of Tropical Biology No. 5 (1992)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.1992.0.5.194

Abstract

Production  structure  of  main  commercial  tree  species  was  studied  in  a  mangrove  forest  in  East Sumatera, Indonesia. This research was carried out in January 1991 using the estimation of standing biomass with stratified clipping method in order to know the production structure of the main commercial tree species in this mangrove forest, i.e. Rhizophora apiculata, Bruguieraparviflora and B. sexangula. The results obtained show that R. apiculata tended to have a sparser foliage of thicker leaves along the stem than B. parviflora or B. sexangula; therefore, R. apiculata is regarded as a shade-intolerant tree species. In contrast, either B. parviflora or B. sexangula tended to have a larger proportion of leaves and branches along the stem; consequently, those species are recognized as shade-tolerant tree species.

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