Effectiveness of Rlm7 resistance against Leptosphaeria maculans (phoma stem canker) in UK winter oilseed rape cultivars.

Plant Pathology
Georgia K MitrousiaBruce D L Fitt

Abstract

The Rlm7 gene in Brassica napus is an important source of resistance for control of phoma stem canker on oilseed rape caused by the fungus Leptosphaeria maculans. This study shows the first report of L. maculans isolates virulent against Rlm7 in the UK. Leptosphaeria maculans isolates virulent against Rlm7 represented 3% of the pathogen population when cultivars with the Rlm7 gene represented 5% of the UK oilseed rape area in 2012/13. However, the Rlm7 gene has been widely used since then, representing >15% of the UK oilseed rape area in 2015/16. Winter oilseed rape field experiments included cultivars with the Rlm7 gene, with the Rlm4 gene or without Rlm genes and took place at five sites in the UK over four cropping seasons. An increase in phoma leaf spotting severity on Rlm7 cultivars in successive seasons was observed. Major resistance genes played a role in preventing severe phoma leaf spotting at the beginning of the cropping season and, in addition, quantitative resistance (QR) in the cultivars examined made an important contribution to control of phoma stem canker development at the end of the cropping season. Deployment of the Rlm7 resistance gene against L. maculans in cultivars with QR in combination with sustainable...Continue Reading

References

Jul 31, 2002·Annual Review of Phytopathology·Bruce A McDonald, Celeste Linde
Aug 6, 2008·Annual Review of Phytopathology·Eva H Stukenbrock, Bruce A McDonald
Oct 24, 2008·Phytopathology·M H BalesdentT Rouxel
Nov 13, 2012·PLoS Pathogens·Guillaume DaverdinMarie-Hélène Balesdent
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Nov 26, 2015·The New Phytologist·Clémence PlissonneauMarie-Hélène Balesdent
Dec 15, 2016·Frontiers in Plant Science·Nicholas J LarkanM Hossein Borhan

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Datasets Mentioned

BETA
AM998638.1

Methods Mentioned

BETA
oilseed
PCRs
PCR
oilseed rape
RIP
transeq

Software Mentioned

genstat
Adriana
image J
Excel
clustal
Spalding
Drakkar
EMBOSS transeq
Roxet

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