cover
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota bogor,
Jawa barat
INDONESIA
BIOTROPIA
ISSN : -     EISSN : -     DOI : -
Core Subject : Agriculture,
BIOTROPIA, the Southeast Asian Journal of Tropical Biology is a scientific publication of SEAMEO BIOTROP. It publishes articles in the broad areas of tropical ecosystems and environmental impacts, biodiversity conservation and sustainable development, environmental and forest biotechnology, covering all aspects of the discipline of biology. Articles published in the journal are papers reporting results of original researches, reviews on spesific topics not available elsewhere in up-to-date form, and short communication in which advances in knowledge of significance are briefly announced.
Arjuna Subject : -
Articles 290 Documents
FLAVOUR OF PAPAYA (Carica papaya L.) FRUIT Hanny Wijaya
BIOTROPIA Vol 20, No 1 (2013)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Papaya is included in five major tropical fruits world production after banana, mango, and pineapple. Indonesia is one of leading country of papaya production after India and Brazil. The Centre of Tropical Fruits Study (PKBT) at Bogor Agricultural University (IPB), Indonesia, has started a long term breeding program since 2003 in order improving the quality of local papayas. Fruit exports are being targeted at more specialized consumers, either those seeking products raised in more environmentally and health-conscious ways or those who are prepared to pay a significant for outstanding flavour. Flavour continues to be the predominant quality characteristic important for a successful international marketing. To understand the biosynthesis pathways are becoming more important for the flavour industry in recent years, as this could aid in the production of the flavour volatiles in the same manner as the natural biosynthesis. It is also necessary to understand the aroma active compounds and their changes during processing because unexpected changes in aroma may cause a product unmarketable even if the other quality factors are acceptable. Understanding the changes of aroma active compounds in the papaya fruit, such as loss of desirable flavour and development of off-flavour during processing will be very helpful for determining proper processing condition. The flavour composition of papaya fruit is reviewed in this paper. This paper will also overview of important publications regarding  the characteristic features of the biology of the fruits, consumption worldwide, commercial application in food processing, though the review of biogenesis of volatiles still be the main focus.   Keywords:  Papaya (Carica papaya L.), flavour, review, volatiles, tropical fruit, biogenesis.  
Isolation of Bacteria from Endomycorrhizae Spores: Their Antagonistic Effects Towards Soilborne Fungal Pathogens and Stimulate Hyphal Growth of Endomycorrhizal Spores in vitro Sri Wilarso Budi
BIOTROPIA Vol 20, No 1 (2013)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Eight isolates bacteria were isolated from surface sterilized endomycorrhizal spores of Gigaspora sp and six isolates bacteria isolated from Glomus sp. The tests to  the antagonists against fungal pathogens and stimulation of endomycorrhizae hyphal development of Gigaspora sp  in vitro  showed that there were three.isolates (GG1, GG5 and GL3) that have the ability to inhibit the growth of pathogens and enhance the development of hyphae in vitro. Enzymatic activity test showed that there were seven isolates that produce cellulase and protease activity that is GG1, GG3, GG6, GG7, GL2, GL4 and GL6   Key words : Bacteria, Endomycorrhizal Spores, Antagonistic effects, Stimulation effects, Fungal pathogens
NEGATIVE IMPACT OF Merremia peltata (L.) Merrill INVASION AT BUKIT BARISAN SELATAN NATIONAL PARK jani master
BIOTROPIA Vol 20, No 1 (2013)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Bukit Barisan Selatan National Park (BBSNP) is the third largest protected area in Sumatra.  Unfortunately, the area is invaded by Merremia peltata which occupied  about  7 000 ha. The aims of this study was to determine the ecological impacts of  M. peltata on plant biodiversity at BBSNP. Three locations were selected for vegetation analysis and M.peltata invasion assessment on the vegetation composition in BBSNP, i.e. the primary forest representing undisturbed area, secondary forest representing burned area, and invaded forest representing forest invaded by M. peltata. Three line transects  were constructed at each locations along 1 km, and  the nested sampling plots were constructed every 100 m with the following quadrants : 20 m x 20 m for trees, 10 m  x 10 m for poles, 5 m  x 5 m for sapling, and 2 m x 2 m for seedling. The data collected were invasions of M. peltata, trees species, and diameter of the trees.  Invaded forest has lower diversity index (1.90)  than the other two. This caused by the invasion of M. peltata as the percentage of coverage in the invaded forest reached 44% compared to secondary and the primary forest which were  27.11% and 1.00%. It is evidenced by the correlation between the percentage of coverage M. peltata and diversity index (-0.988).
Powder Formulation of Yeasts Antagonists Cryptococcus albidus and Cryptococcus terreus as Biofungicide Suryo Wiyono
BIOTROPIA Vol 20, No 1 (2013)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Suryo Wiyono and Widodo. Powder Formulation of Yeasts Antagonist  Cryptococcus albidus and   Cryptococcus terreus as Biofungicide.  The research has following objectives: 1) to investigate compatibility of yeasts antagonist  C. albidus and C. terreus, 2) to obtain suitable carrier  in powder formulation for those two yeasts,  3) to get appropriate formulation additives for those yeasts,  and 4) to obtain optimum powder formulation consisting yeasts, carrier materials and additives.  Compatibility of C. albidus and  C. terreus  was tested through bio-assay  against Lasiodiplodia theobromae on detached banana fruit  and Alternaria solani on detached tomato leaves.  Compatibility was indicated by no reduction of antagonistic activity.  Benomyl-resistant mutant of C. albidus  and cycloheximide-resistant mutant of  C. terreus were mixed with sterilized tapioca, talc and kaolin  to get initial yeasts density of  8.5 log cfu/g and water content of 15%,  then  packed by plastic bag and stored under room temperature. Survival of formulated yeasts was assessed monthly by plating on PDA medium containing 150 ppm cycloheximide for C. terreus, and 150 ppm benomyl for C. albidus.  Yeasts population was expressed in log cfu/g materials.  To determine effect of carrier materials on antagonistic activity, bio-assay of formulated yeasts against pathogens was conducted after 3 months storage. Tested additives i.e. CaCl2, pure chitin and crab shell powder were added into suspension of C. albidus and C. terreus to get concentration of 1.25%,  0.5 %  and 0. 1% (w/v). Sterilized aquadest and yeasts without additives was used as control. Then  the treatments was examined the antagonistic activity through  bio-asaay  on detached banana fruits and tomato leaves. Appropriate additive(s) was determined by its ability to increase antagonistic activity of yeasts. Storability and antagonistic activity of  C. albidus dan C. terreus  in the mixture of best carrier and additive were examined.  C. terreus  was compatible to C. albidus. The best carrier materials supporting highest survival of C. terreus was tapioca and talc, those supported survival for four months storage.  Talc was best carrier material for C. albidus formulation by maintaining its survival for five months storage. Additives which able to increase antagonistic activity of C. terreus were CaCl2  0.1 % , pure chitin  0.1 %  and crab shell powder  0.5%.  Additives providing best increase of antagonistic activity of C. albidus were CaCl2 0.5%, pure chitin  1.25 %  and crab shell 1.25%.  Supplementation of chitin and crab shell, both at the rate of 1.25% into talc-base powder formulation  increased  survival of both yeasts at one months storage, however no significant effect subsequently. Key words: formulation, yeasts antagonists, Cryptococcus terreus, Cryptococcus albidus,  carrier agent, talc, tapioca, kaolin, CaCl2, chitin, crab shell powder
ENHANCED PRODUCTION LEVEL OF QUININE IN CELL SUSPENSION CULTURE OF CINCHONA LEDGERIANA MOENS BY PACLOBUTRAZOL Diah Ratnadewi; Diah Ratnadewi; Dedi Satriawan; Maryono Sumaryono
BIOTROPIA Vol 20, No 1 (2013)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Quinine is one of the major alkaloids in Cinchona spp., and it is used both as a medication and as a drink additive. The plant produces most of its alkaloids in the bark after 6–8 years of age. Repeated harvests can be performed until the plant dies, but only after every 3–5 years. We tested an improved method for culturing cell suspensions of Cinchona ledgeriana to investigate the possibility of increasing production of quinine. The clone QRC 315 was treated with either a growth retardant (abscisic acid or paclobutrazol) or precursor feeding of L-tryptophan. To generate stress, we applied mannitol at 5.3 g/L combined with sucrose at a lower concentration (20 g/L), and we used sucrose at 30 g/L as the control. Paclobutrazol (7 mg/L) significantly suppressed cell growth and produced the highest level of quinine (11%) after 7 weeks of culture. L-tryptophan also reduced cell growth, but without any positive effect in the production of quinoline. The highest amount of quinine per culture flask, however,  resulted in cells treated with 3 mg/L abscisic acid.
THREE NEW RECORDS OF PLASMODIAL MYXOMYCETES FROM ANDA ISLAND, PANGASINAN, PHILIPPINES Thomas Edison dela Cruz
BIOTROPIA Vol 20, No 1 (2013)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The unique life cycle and fascinating fruiting bodies of myxomycetes make them ideal model organisms for the study of cellular differentiation. Our research study then focuses on the diversity and abundance of myxomycetes found in Anda Island, Pangasinan in Northern Philippines. A total of 180 moist chambers were prepared from ground leaf litter and twigs collected from a 15 m2 quadrat within the study site. Twenty four species of myxomycetes belonging to 11 genera were collected and identified from the moist chambers: Arcyria (2), Collaria (1), Comatricha (1), Craterium (2), Diachea (1), Diderma (2), Didymium (1), Elaeomyxa (1), Perichaena (1), Physarum (11), and Stemonitis (1). Of all moist chambers, 55% yielded myxomycetes. Ground leaf litter (29%) yielded more myxomycetes than twigs (26%). Among the collected species, one for each of the genera Arcyria, Craterium, Diderma, and Physarum were recorded to be abundant. Interestingly, three species of myxomycetes are new records for the Philippines: Craterium microcarpum, Physarum decipiens and Elaeomyxa miyazakiensis. This is the first report of myxomycetes in Anda Island, Pangasinan, Philippines.
SOMATIC EMBRYOGENESIS FROM MERISTEM EXPLANTS OF GINGER Otih Rostiana; Sitti Fatimah Syahid
BIOTROPIA Vol 15, No 1 (2008)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The use of planting materials from in vitro culture, especially derived from somatic embryos has some advantages such as  genetically stable and pathogen-free. Meristem culture of ginger through somatic embryogenesis could be a potential method for producing pathogen-free planting materials. Somatic embryogenesis on ginger was performed to obtain vigorous plantlets having the same rhizome size as the mother plant. Callus was induced from meristem tissue of inner bud of Indonesian ginger rhizome Var. Cimanggu-1 and consecutively subcultured into certain media at each steps of experiments. The vigorous embryogenic calli were observed  on MS medium containing 100 mgl-1 glutamine and 2% sucrose with addition of 1.0 mgl-1 2,4-D + 3.0 mgl-1 BA. The highest number of somatic embryos (about 82.0.g-1 friable calli) was achieved on that medium, 4 weeks after culturing. Furthermore, the optimum growth of embryogenic calli containing somatic embryo was obtained on MS medium enriched with 6% sucrose. The highest number of mature somatic embryos (57.2 embryos) was achieved on MS medium, 18 days after incubation. The regeneration potency of somatic embryos obtained from ginger meristem was 51.20%.g-1 friable callus. The valuable result of this study was the achievement of normal rhizome size of regenerated plantlets, instead of micro rhizome.
OCCURRENCE AND DISTRIBUTIONAL RANGE OF MANGROVE VASCULAR FLORA OF CATANDUANES ISLAND, LUZON, PHILIPPINES JIMMY TEVAR MASAGCA
BIOTROPIA Vol 15, No 2 (2008)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Mangroves play very significant roles not only on the economic aspects but also on the ecological aspects as biobelting for tidal surges and tsunamis. The loss of human lives due to the deadly tsunamis in East Asia and the unabated destruction of coastal vegetation have resulted in a renewed focus on the mangrove resources. The purpose of this paper is to report the existing mangrove database of the typhoon-prone island province of Catanduanes in Luzon, Philippines which will be used as bases in determining the appropriate educational management initiatives of various sectors for mangrove rehabilitation and regeneration.   A total of 37 species of mangrove vascular flora (13 species of major mangrove elements, 10 species of minor mangrove elements and 14 associated mangrove species) were identified in the island under study. Two species of the genus Avicennia (A. marina and A. officinalis) were noted in the island. The other genera (Bruguiera, Ceriops, Sonneratia and Rhizophora) are well distributed in the designated eco-zones. Nypa fruticans is the most important mangrove plant species and a member of the screwpine family (Pandanaceae), Pandanus tectorius which is an associated mangrove species is well-distributed all throughout the island.Key words:  Mangroves, vascular flora, Catanduanes, Philippines, occurrence and distribution.
IV. STORAGE AND GERMINATION TESTS ON SHOREA JAVANICA SEEDS M.I.J. UMBOH
BIOTROPIA Vol 1, No 1 (1987)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Seeds  of  Shorea  javanica  K  &  V  (Dipterocarpaceae),  were  subjected  to  different  treatments  of temperature (27 ± 2°C, 20 ± 2°C and < 10°C), coating (ash and paraffin) and relative humidity (20, 66 and 86%) and their germination capability as well as moisture content assessed after 3, 7, 14 and 30 days of storage. The germination percentage of  the seeds stored 30 days  in a  cloth bag under different  conditions of temperature showed highly significant differences  (a = 0.01). No significant differences were  found on  the effect of coating, duration of storage as well as on the interaction between these two factors. The moisture content of the seeds between 13 and 14% gave a germination percentage above 50% after 30 days.   
THE GENUS MIMOSA WITH SPECIAL REFERENCE TOM. QUADRIVALVIS L. VAR. LEPTOCARPA (D.C.) EARNEDY, A NEW SPECIES RECORD FOR THE WEED FLORA IN MALAYSIA*) M. A HAJI MOHAMED; BAKI BAKI,; B. BAKAR; H. NOORMA WATI
BIOTROPIA No 9 (1996)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

An exploratory floristic survey of the genus Mimosa was conducted in 1993 to ascertain species diversity and their spatial patterns of distribution in Peninsular Malaysia. A new species record of uncertain indigene, M.. quadrivalvis was recorded for the first time in restricted localities along the roadsides in Pekan Darat and Bertam, Seberang Perai, Gurun and Bedong  in Kedah  in addition  to widely distributed and seemingly  ubiquitous presence of M. invisa Mart. ex. Colla and M. pudica L. The latter two species were mostly found in open, disturbed and derelict habitats, agricultural areas and ex-mining  lands. Both species exhibited  largely  contagious and overdispersed distribution patterns with positive peaks in pattern intensity values although regularity or underdispersed distribution patterns do manifest in certain localities. The giant mimosa, M. pigra inhabited in clustered thickets, large pockets of lands in the urban and sub-urban localities in the states of Penang, Perak, Kelantan, Kuala Lumpur and Negeri Sembilan. In other states, M. pigra was confined to a few localities in smaller patches. Except for M. quadrivalvis, the other species of Mimosa are serious weeds  in  the agricultural,  recreational and  residential and derelict areas. A key  to  the Mimosa species is constructed along with brief descriptions on their morphology and ecology.Key words: Malaysia/Weed ecology/Mimosa invisa/Mimosa pigra/Mimosa pudica/Mimosa quadrivalvis/ Weed distribution/Weed anatomy and morphology.

Page 1 of 29 | Total Record : 290