Effect of seed priming with Serratia plymuthica and Pseudomonas chlororaphis to control Leptosphaeria maculans in different oilseed rape cultivars

Abuamsha, R., Salman, M. and Ehlers, R. U. (2011) Effect of seed priming with Serratia plymuthica and Pseudomonas chlororaphis to control Leptosphaeria maculans in different oilseed rape cultivars European Journal of Plant Pathology, 130 (3). pp. 287-295. DOI 10.1007/s10658-011-9753-y.

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Abstract

The efficacy of a seed treatment of oilseed rape (OSR) (Brassica napus) with the rhizobacteria Serratia plymuthica (strain HRO-C48) and Pseudomonas chlororaphis (strain MA 342) applied alone or in combination against the blackleg disease caused by Leptosphaeria maculans was tested with different cultivars. Seeds were soaked in bacterial suspensions (bio-priming) to obtain log(10) 6-7 CFU seed(-1). Cotyledons were inoculated with a 10 ul droplet of L. maculans spore suspension of log(10) 7 spores ml(-1) and the disease index (size of lesions) was evaluated 14 days later. A mean disease reduction of 71.6 was recorded for S. plymuthica and of 54 for P. chlororaphis. The combined treatment was not superior to the treatment with S. plymuthica alone. The reduction of the disease caused by S. plymuthica was independent of the cultivar's susceptibility, whereas the control effect recorded with P. chlororaphis increased with decreasing cultivar resistance to blackleg disease. The bacterial colonization of OSR was restricted to the roots and hypocotyl. No significant difference in bacterial colonization of the rhizosphere was observed between different cultivars, nor between single or combined bacterial seed treatments.

Document Type: Article
Keywords: Brassica napus Blackleg Biological control Bio-priming Antagonists Root colonization phoma stem canker biological-control brassica-napus borne diseases ma 342 biocontrol hro-c48 resistance infection bacteria
Refereed: Yes
DOI etc.: 10.1007/s10658-011-9753-y
ISSN: 0929-1873
Date Deposited: 01 Nov 2012 05:07
Last Modified: 01 Nov 2012 05:07
URI: http://eprints.uni-kiel.de/id/eprint/16603

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