Biological control of collar rot disease with broad-spectrum antifungal bacteria associated with groundnut

Kishore, G K and Pande, S and Podile, A R (2005) Biological control of collar rot disease with broad-spectrum antifungal bacteria associated with groundnut. Canadian Journal of Microbiology, 51 (2). pp. 123-132. ISSN 1480-3275

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Bacteria associated with 6 habitats of groundnut were evaluated for their broad-spectrum antifungal activity and suppression of collar rot (Aspergillus niger) of groundnut. Three hundred and ninety-three strains were tested against 8 fungal pathogens of groundnut including 5 necrotrophic fungi, Aspergillus flavus, A. niger, Rhizoctonia bataticola, Rhizoctonia solani, and Sclerotium rolfsii, and 3 biotrophic fungi, Cercospora arachidicola, Phaeoisariopsis personata, and Puccinia arachidis. Pseudomonas sp. GRS 175, Pseudomonas aeruginosa GPS 21, GSE 18, GSE 19, and GSE 30, and their cell-free culture filtrates were highly antagonistic to all the test fungi. The cell-free culture filtrates of these bacteria were fungicidal and induced mycelial deformations including hyphal bulging and vacuolization in necrotrophic fungi. The cell-free culture filtrates at 10% (v/v) concentration significantly inhibited the spore germination of biotrophic fungi. In the greenhouse, P. aeruginosa GSE 18 emerged as an effective biocontrol agent of collar rot closely followed by P. aeruginosa GSE 19. The bacterium applied as a seed treatment reduced the pre-emergence rotting and postemergence wilting by >60%. Pseudomonas aeruginosa GSE 18 effectively colonized the groundnut rhizosphere, both in native and in A. niger infested potting mixtures. Ninety-day-old peat formulation of P. aeruginosa GSE 18 had biocontrol ability comparable with the midlog-phase cells. Pseudomonas aeruginosa GSE 18, tolerant to thiram, in combination with the fungicide had an improved collar rot control. The present study was a successful attempt in selection of broad-spectrum and fungicide tolerant biocontrol agents that can be a useful component of integrated management of collar rot

Item Type: Article
Uncontrolled Keywords: Arachis, biocontrol, crown rot, peanut
Subjects: Mandate crops > Groundnut
Depositing User: Ms K Syamalamba
Date Deposited: 25 Oct 2011 04:16
Last Modified: 25 Oct 2011 04:16
Official URL:
Funders: The Andhrapradesh- Netherland Biotechnology Programme, Institute of Public Enterprise, Hyderabad
Acknowledgement: The Andhra Pradesh – Nethelrands Biotechnology Programme, Institute of Public Enterprise, Hyderabad, India, supported part of this work as a research grant to A.R. Podile and a Senior Research Fellowship to G. Krishna- Kishore; we also thank the UGC–SAP and DST–FIST programs of the Department of Plant Sciences, University of Hyderabad
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