Comparative evaluation of Pseudomonas fluorescens and their lipopolysaccharides as implicated in induction of resistance against pearl millet downy mildew

Niranjan Raj, S. and Lavanya, S. N. and Amruthesh, K. N. and Niranjana, S. R. and Shetty, H. Shekar (2011) Comparative evaluation of Pseudomonas fluorescens and their lipopolysaccharides as implicated in induction of resistance against pearl millet downy mildew. Archives of Phytopathology and Plant Protection, 44 (13). pp. 1285-1299. ISSN 0323-5408

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Official URL: http://dx.doi.org/10.1080/03235408.2010.493750

Abstract

Two plant growth promoting Pseudomonas fluorescens isolates namely UOM SAR 14 and UOM SAR 80 most effectively induced resistance against downy mildew disease of pearl millet both under greenhouse and field conditions. Relative assessment of live cultures of P. fluorescens UOM SAR 14 and UOM SAR 80 and their lipopolysaccharides (LPS) extracted from their cell walls were evaluated for their ability to induce resistance against pearl millet downy mildew. Treatment with P. fluorescens and their LPS enhanced the seed germination and seedling vigour considerably. Although both live cultures and their LPS treatment induced resistance in pearl millet against downy mildew disease both under greenhouse and field conditions as evidenced by the significant reduction of the disease, live cultures were more effective than the LPS in level of resistance induced. Live cultures of UOM SAR 14 and UOM SAR 80 induced 66% and 57% protection while their respective LPS extracts offered 59 and 53% protection against downy mildew disease under greenhouse conditions. Similarly, under field conditions with very heavy inoculum pressure live cultures offered 75% and 70%, and their LPS offered 71% and 67% protection, respectively. In either case, the time gap required for the building up of resistance was found to be 3 days and nature of the resistance induced was systemic and durable with both live cultures and their lipopolysaccharides. It was also noticed that the live bacteria significantly varied in the degree of protection offered and so also their respective LPS.

Item Type: Article
Additional Information: Unmapped bibliographic data: PY - 2011/// [EPrints field already has value set] M3 - 10.1080/03235408.2010.493750 [Field not mapped to EPrints] JA - Arch. Phytopathol. Plant Prot. [Field not mapped to EPrints]
Uncontrolled Keywords: Pseudomonas Sclerospora lipopolysaccharide downy mildew disease resistance
Subjects: Agriculture Biological Sciences > Botany
University of Mysore > PG Campuses > Manasagangotri, Mysore > Agriculture Biological Sciences > Botany

Agriculture Biological Sciences > Biotechnology
University of Mysore > PG Campuses > Manasagangotri, Mysore > Agriculture Biological Sciences > Biotechnology
Divisions: PG Campuses > Manasagangotri, Mysore > Biotechnology
PG Campuses > Manasagangotri, Mysore > Botany
Depositing User: Praveen Kumari B.L
Date Deposited: 13 Jun 2013 06:39
Last Modified: 22 Jul 2014 07:28
URI: http://eprints.uni-mysore.ac.in/id/eprint/12542

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