Induction of resistance against downy mildew on sunflower by rhizobacteria

Nandeesh kumar, P. and Kini, K. Ramachandra and Prakash, H. S. and Niranjana, S. R. and Shetty, H. Shekar (2008) Induction of resistance against downy mildew on sunflower by rhizobacteria. JOURNAL OF PLANT INTERACTIONS, 3 (4). pp. 255-262.

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Official URL: http://dx.doi.org/10.1080/17429140802245697

Abstract

Induction of resistance to downy mildew caused by Plasmopara halstedii in sunflower was studied after treatment with PGPR (plant growth promoting rhizobacteria) strain INR7 (Bacillus spp). Treatment of sunflower seeds with 1 x 10(8) cfu/ml of PGPR strain INR7 resulted in decreased disease severity and offered 51 and 54% protection under green house and field conditions, respectively. The induction of resistance to P. halstedii by PGPR strain INR7 was accompanied by the accumulation of various host defense-related enzymes in susceptible sunflower seedlings. Enhanced activation of catalase (CAT), phenylalanine ammonia-lyase (PAL), peroxidase (POX), polyphenol oxidase (PPO) and chitinase (CHI) was evident at 6, 9, 12, 12 and 12 h post inoculation, respectively, in sunflower seedlings raised from seeds treated with PGPR strain INR7. This enhanced and early activation of defense-related responses in the susceptible cultivar after treatment with PGPR strain INR7 was comparable to that in the resistant cultivar. The results indicate that PGPR strain INR7 induced resistance against P. halstedii in sunflower is mediated through enhanced expression of defense mechanism.

Item Type: Article
Uncontrolled Keywords: defense-related proteins; disease resistance; induction of resistance; plant growth promoting rhizobacteria (PGPR)
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: Users 8 not found.
Date Deposited: 19 Apr 2013 07:49
Last Modified: 12 Aug 2013 05:06
URI: http://eprints.uni-mysore.ac.in/id/eprint/4924

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