Chiang Mai Journal of Science, Faculty of Science, Chiang Mai University

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Actinomycetes from Tropical Limestone Caves

Paper Type	Contributed Paper
Title	Actinomycetes from Tropical Limestone Caves
Author	Nanthavut Niyomvong, Wasu Pathom-aree, Arinthip Thamchaipenet andKannika Duangmal
Email	fscikkd@ku.ac.th
Abstract: The cultivable actinomycetes from tropical limestone caverns at Khao No-Khao Kaeo karst, Thailand, were investigated. In total, 276 actinomycetes were isolated from 10 soil samples using different selective isolation procedures. The predominant actinomycetes from all samples were members of the genus Streptomyces (94.6%) as they contained LL-diaminopimelic acid (A₂pm) in their whole cell hydrolysates. The remaining 15 isolates (5.4%), rich in meso-A₂pm in whole cell hydrolysates were characterized by 16S rRNA gene sequencing. They were shown to represent strains from 8 different genera namely Actinomadura, Actinoplanes, Gordonia, Microbispora, Micromonospora, Nocardia, Nonomuraea and Saccharopolyspora. A good agreement was found between the results based on morphology, presence of meso-A₂pm and 16S rRNA gene phylogeny. Microwave treatment of soil samples was found to promote the isolation of rare actinomycetes. Successful isolation of members of the genus Actinomadura and Saccharopolyspora from caves was reported for the first time. This study confirms significant diversity of cultivable actinomycetes from neglected habitats such as limestone caves in Thailand.
Start & End Page	373 - 388
Received Date	2011-11-04
Revised Date
Accepted Date	2012-05-28
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Keyword	actinomycetes, limestone cave, selective isolation, 16S rRNA gene
Volume	Vol.39 No.3 (JULY 2012)
DOI
Citation	Niyomvong N., Pathom-aree W. and Duangmal A.T.A., Actinomycetes from Tropical Limestone Caves, Chiang Mai Journal of Science, 2012; 39(3): 373-388.
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Actinomycetes from Tropical Limestone Caves

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