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Studies on Frankia sp. LLR 02022 from Casuarina cunninghanmiana and its mutant LLR 02023 (1987)

Lechevalier, M. P. ; Labeda, D. P. ; Ruan, J.-S.

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 70 (1987), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Frankia sp. LLR 02022, isolated from nodules of Casuarina cunninghamiana Miq., and its spontaneous mutant LLR 02023, show similar morphology but slight differences in cell chemistry and major differences in carbohydrate utilization. The mutant has the same phospholipids, phospholipid fatty acids and menaqmnones as the parent, but shows quantitative differences in peptidoglycan composition, pigment production and triglyceride fatty acids. The parent utilizes only rhamnose; the mutant also utilizes arabinose, glucose and xylose under certain conditions of growth. The significance of these findings is discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1987.tb06140.x

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Investigation of actinomycete diversity in the tropical rainforests of Singapore (1999)

Wang, Y ; Zhang, Z S ; Ruan, J S ; [et al.]

Springer

Journal of industrial microbiology and biotechnology 23 (1999), S. 178-187

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ISSN: 1476-5535

Keywords: Keywords: actinomycete diversity; phylogeny; rRNA; tropical rainforest

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: Five thousand actinomycetes were isolated from soil samples collected from rainforests in Singapore and the generic identities of these isolates were determined by using a procedure that combined morphological, chemotaxonomic and 16S rDNA sequence-based phylogenetic analyses. Actinomycetes belonging to a total of 36 genera were identified. The most abundant isolates are members of Streptomyces, Micromonospora, Actinoplanes, Actinomadura, Nonomuria, Nocardia and Streptosporangium. By phylogenetic analysis of 16S rDNA sequences of our isolates together with those of known actinomycete species, we also evaluated the species diversity of several genera including Streptomyces, Micromonospora, Nonomuria, and Actinomadura. We found that: first, the tropical isolates are present in most clades represented by known species; and second, many tropical isolates form new clades distant from the known species, indicating the presence of unidentified taxa at both species and genus levels. Based on these results, we conclude that actinomycete diversity in the tropical rainforest is very great and should represent an excellent source for discovery of novel bioactive compounds.