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Pathum Thani, Thailand

Liu J.-K.,Mae Fah Luang University | Gareth Jones E.B.,BIOTEC Central Research Unit | Chukeatirote E.,Mae Fah Luang University | Bahkali A.H.,King Saud University | And 2 more authors.
Mycotaxon | Year: 2011

During studies of palm fungi, a new Lignincola species was found in Thailand. It differs from other members of the genus in ascospore dimensions and the occurrence of its ascomata on the adhesive pad of a marine invertebrate. Lignincola conchicola is described and illustrated, and a key to Lignincola species is provided. The palm Phoenix is a new substratum for marine fungi. © 2011 Publishing Technology. Source

Washio K.,Hokkaido University | Lim S.P.,University of California at Berkeley | Roongsawang N.,BIOTEC Central Research Unit | Morikawa M.,Hokkaido University
Bioscience, Biotechnology and Biochemistry | Year: 2010

Pseudomonas sp. MIS38 produces an effective biosurfactant named arthrofactin, which is a cyclic lipopeptide synthesized by a mega complex composed of three nonribosomal peptide synthetases. In order to gain insight into the control mechanism of arthrofactin production, a Tn5 mutant library was constructed and screened for arthrofactin-deficient mutants. Along with a number of mutations that occurred in the arthrofactin synthetase operon, three other mutants harbored distinct Tn5 insertions in the genes encoding SyrF-like protein (arfF), heat shock protein (htpG), and (p)ppGpp synthetase/hydrolase (spoT). Epistasis analyses revealed that spoT functions early in the arthrofactin production pathway. We also found that spoT affects MIS38 swarming, biofilm formation, and the cell morphology. Source

McConkey K.R.,E 64 Sainikpuri | Brockelman W.Y.,BIOTEC Central Research Unit | Brockelman W.Y.,Mahidol University
Ecology | Year: 2011

Plant species with generalized dispersal mutualisms are considered to be robust to local frugivore extinctions because of redundancy between dispersal agents. However, real redundancy can only occur if frugivores have similar foraging and ranging patterns and if fruit is a limiting resource. We evaluated the quantitative and qualitative contributions of seed dispersers for an endochorus mast-fruiting species, Prunus javanica (Rosaceae) in Khao Yai National Park, Thailand, to evaluate the potential redundancy of dispersers. Data were collected from tree watches, seed/fruit traps, and seed transects under and away from fruiting trees, feeding and seed deposition by gibbons (Hylobates lar), and evaluations of seed and firstyear seedling survival. We identified three clusters of dispersers within the network. Most (.80%) frugivore species observed were small birds and squirrels that were not functional dispersers, dropping most seeds under or very near the tree crown, where seedling survival was ultimately nil. Monkeys (Macaca leonina) were low-quality, short-range dispersers, but they dispersed large numbers of seeds and were responsible for 67% of surviving first-year seedlings. Gibbons and Oriental Pied Hornbills (Anthracoceros albirostris) handled few fruits, but they provided the highest quality service by carrying most seeds away from the canopy to medium and long distances, respectively. Although there was overlap in the deposition patterns of the functional dispersers, they displayed complementary, rather than redundant, roles in seed dispersal. Satiation of all functional dispersers further limited their capacity to ''replace'' one another. Redundancy must be evaluated at the community level because each type of disperser may shift to different species in the non-masting years of P. javanica. Our results underscore the need for research on broader spatial and temporal scales, which combines studies of dispersal and plant recruitment, to better understand mechanisms that maintain network stability. © 2011 by the Ecological Society of America. Source

Kantha T.,Chiang Mai University | Chaiyasut C.,Chiang Mai University | Kantachote D.,Prince of Songkla University | Sukrong S.,Chulalongkorn University | Muangprom A.,BIOTEC Central Research Unit
African Journal of Microbiology Research | Year: 2010

Soil samples from organic saline paddy fields from 14 provinces of the northeast region of Thailand were collected and used for isolating photosynthetic bacteria (PB) prepared as a Soil and Straw Products (SSPs). PB from these SSPs were further grown in double strength G5 broth under microaerobic-light conditions before purification. A total of 130 isolates were then screened for growth in G5 broth under microaerobic-dark conditions for 24 h and 15 isolates were further selected by secondary screening in G5 broth under microaerobic-light conditions for 24 h. Four isolates (tk35, tk85, tk103 and tk123) were selected and all were identified as Rhodopseudomonas palustris based on their 16S rRNA gene. After incubation in SSP for 4 weeks with microaerobic-dark conditions, all SSPs had pH values in a range of 5.33 -7.17 and electrical conductivity (EC) values were between 3.02-12.93 dS/m. It was also found that the 5-aminolevulinic acid (ALA) content increased with time to achieve levels of 2.95, 2.94, 2.95 and 2.96 mM, from strains tk35, tk85, tk103 and tk123, respectively. The results indicate that SSP containing selected PB could produce ALA and this could be practically applied to organic saline paddy fields and increase growth and yields of rice. © 2010 Academic Journals. Source

Liu J.-K.,Mae Fah Luang University | Chomnunti P.,Mae Fah Luang University | Cai L.,CAS Institute of Microbiology | Phookamsak R.,Mae Fah Luang University | And 5 more authors.
Sydowia | Year: 2010

Palm fungi are a taxonomically diverse group. Recent collections of fungi from palms in northern Thailand resulted in the discovery of a new species of Neodeightonia, herein described as N. palmicola. This new species is distinct in having hyaline, aseptate ascospores surrounded by a remarkable sheath. This study compares this new species with related taxa of Botryosphaeria and Neodeightonia using morphological and molecular characteristics. Sequence data show our species is more closely related to Neodeightonia subglobosa (the type species of the genus) than to Botryosphaeria species. Morphological and molecular features of the new species are described. Source

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