Delftia tsuruhatensis WGR–UOM–BT1, a novel rhizobacterium with PGPR properties from Rauwolfia serpentina (L.) Benth. ex Kurz also suppresses fungal phytopathogens by producing a new antibiotic—AMTM

S.P, Prasannakumar and H.G, Gowtham and P, Hariprasad and K, Shivaprasad and S.R, Niranjana (2015) Delftia tsuruhatensis WGR–UOM–BT1, a novel rhizobacterium with PGPR properties from Rauwolfia serpentina (L.) Benth. ex Kurz also suppresses fungal phytopathogens by producing a new antibiotic—AMTM. Letters in Applied Microbiology. ISSN ISSN 0266-8254

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Abstract

The bacterial strain designated as WGR–UOM–BT1 isolated from rhizosphere of Rauwolfia serpentina exhibited broad-spectrum antifungal activity and also improved early plant growth. Based on morphological, biochemical and 16S rRNA gene sequence analyses,the strain BT1 was identified as Delftia tsuruhatensis (KF727978). Under in vitro conditions, the strain BT1 suppressed the growth of wide range of fungal phytopathogens. Purified antimicrobial metabolite from the strain BT1 was identified as nitrogen-containing heterocyclic compound, ‘amino(5-(4-methoxyphenyl)-2-methyl-2-(thiophen-2-yl)-2,3-dihydrofuran-3-yl)methanol’ (AMTM), with molecular mass of 340•40 and molecular formula of C17H19NO3S. The strain BT1 was positive for rhizosphere colonization (tomato), IAA production, 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity and phosphate solubilization. Under laboratory and greenhouse conditions, the strain BT1 promoted plant growth and suppressed foliar and root fungal pathogens of tomato. Therefore,antimicrobial and disease protection properties of strain BT1 could serve as an effective biological control candidate against devastating fungal pathogens of vegetable plants. Besides, the production of IAA, P solubilization and ACC deaminase activity enhance its potential as a biofertilizer and may stabilize the plant performance under fluctuating environmental conditions

Item Type: Article
Uncontrolled Keywords: Alternaria solani, AMTM, antagonism, Delftia tsuruhatensis, Fusarium oxysporum
Subjects: Departments at MU > Manipal Centre for Natural Sciences
Depositing User: MCNS Editor
Date Deposited: 30 Sep 2015 11:50
Last Modified: 01 Oct 2015 12:00
URI: http://eprints.manipal.edu/id/eprint/144233

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