NDLI: Characterization of the fungicidal activity of Calothrix elenkinii using chemical methods and microscopy

Content Provider	Springer Nature Link
Author	Natarajan, C. Prasanna, R. Gupta, V. Dureja, P. Nain, L.
Copyright Year	2012
Abstract	An investigation was directed towards biochemical characterization of cyanobacterium Calothrix elenkinii and analysis of the chemical nature and mode of action of its fungicidal metabolite(s) against oomycete Pythium debaryanum. Biochemical characterization of the culture in terms of carbohydrate utilization revealed the facultative nature of C. elenkinii. Unique antibiotic markers were also found for this strain. 16S rDNA sequencing of the strain revealed 98% similarity with Calothrix sp. PCC7101. The fungicidal activity was tested by disc diffusion assay of different fractions of the culture filtrate. A minimum inhibitory concentration of 10 μl was recorded for ethyl acetate fraction of the 7-weeks old culture filtrates. HPLC, followed by NMR spectral analysis demonstrated the presence of a substituted benzoic acid in the ethyl acetate fraction. Microscopic examination revealed distinct granulation, followed by disintegration of the hyphae of Pythium sp., indicating the presence of an active metabolite in the culture filtrates of Calothrix sp. The fungicidal activity of C. elenkinii can be attributed to the presence of 3-acetyl-2-hydroxy-6-methoxy-4-methyl benzoic acid. This is the first report of a benzoic acid derivative having fungicidal activity in cyanobacteria.
Starting Page	51
Ending Page	57
Page Count	7
File Format	PDF
ISSN	00036838
Journal	Applied Biochemistry and Microbiology
Volume Number	48
Issue Number	1
e-ISSN	16083024
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-12-29
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Microbiology Medical Microbiology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Biochemistry Applied Microbiology and Biotechnology

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