Diversity of cultivable rhizobacteria across tomato growing regions of Karnataka

Hariprasad, P. and Venkateswaran, G. and Niranjana, S. R. (2014) Diversity of cultivable rhizobacteria across tomato growing regions of Karnataka. Biological Control, 72. pp. 9-16.

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Abstract

Seven hundred and fifty-two rhizobacteria were isolated from 186 rhizosphere soil samples collected across tomato growing regions of Karnataka. Among them, 26% strains were Gram positive and other 74% were Gram negative and dominant being Bacillus and Pseudomonas. Sampling of different locations showed variation in species richness and diversity indices. Similarity matrix computed with Jaccard’s coefficient and principle coordinate analysis to correlate bacterial diversity revealed that rhizobacterial genera of Mysore, Mandya and Kolar soil samples were very closely related and rarefaction curve analysis indicated that these soil samples also harbored higher number of rhizobacteria which included all the genera studied. PGPR trait analysis revealed that most of the rhizobacteria were endowed with more than one beneficial trait which may act individually or simultaneously, and indole acetic acid production and phosphate solubilization are the two predominant traits exhibited by these rhizobacteria. Rhizobacterial isolates also showed a varied level of plant growth promotion traits and offered protection against fungal origin foliar and root pathogens. Among the nine regions studied, Mysore, Mandya and Kolar regions recorded higher percentage of promising PGPRs in comparison with other regions studied of Karnataka.

Item Type:	Article
Uncontrolled Keywords:	Rhizobacteria Diversity Indole acetic acid Plant growth promotion Fusarium wilt Early blight
Subjects:	600 Technology > 08 Food technology > 23 Vegetables > 03 Tomato
Divisions:	Food Microbiology
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	22 Sep 2016 12:27
Last Modified:	28 Dec 2016 12:58
URI:	http://ir.cftri.res.in/id/eprint/12311

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