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Int. J. Mol. Sci. 2011, 12(5), 3055-3071; doi:10.3390/ijms12053055
Article

Genetic Diversity and Phylogeny of Antagonistic Bacteria against Phytophthora nicotianae Isolated from Tobacco Rhizosphere

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Received: 12 March 2011 / Revised: 3 April 2011 / Accepted: 20 April 2011 / Published: 12 May 2011
(This article belongs to the Section Molecular Pathology)
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Abstract

The genetic diversity of antagonistic bacteria from the tobacco rhizosphere was examined by BOXAIR-PCR, 16S-RFLP, 16S rRNA sequence homology and phylogenetic analysis methods. These studies revealed that 4.01% of the 6652 tested had some inhibitory activity against Phytophthora nicotianae. BOXAIR-PCR analysis revealed 35 distinct amplimers aligning at a 91% similarity level, reflecting a high degree of genotypic diversity among the antagonistic bacteria. A total of 25 16S-RFLP patterns were identified representing over 33 species from 17 different genera. Our results also found a significant amount of bacterial diversity among the antagonistic bacteria compared to other published reports. For the first time; Delftia tsuruhatensis, Stenotrophomonas maltophilia, Advenella incenata, Bacillus altitudinis, Kocuria palustris, Bacillus licheniformis, Agrobacterium tumefaciens and Myroides odoratimimus are reported to display antagonistic activity towards Phytophthora nicotianae. Furthermore, the majority (75%) of the isolates assayed for antagonistic activity were Gram-positives compared to only 25% that were Gram-negative bacteria.
Keywords: genetic diversity; antagonistic bacteria; Phytophthora nicotianae; tobacco; rhizosphere genetic diversity; antagonistic bacteria; Phytophthora nicotianae; tobacco; rhizosphere
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Jin, F.; Ding, Y.; Ding, W.; Reddy, M.; Fernando, W.D.; Du, B. Genetic Diversity and Phylogeny of Antagonistic Bacteria against Phytophthora nicotianae Isolated from Tobacco Rhizosphere. Int. J. Mol. Sci. 2011, 12, 3055-3071.

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