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000001650 084__ $$2WoS$$aAgronomy
000001650 084__ $$2WoS$$aBiotechnology & Applied Microbiology
000001650 084__ $$2WoS$$aPlant Sciences
000001650 1001_ $$0P:(DE-Juel1)129337$$aJansen, M.$$b0$$uFZJ
000001650 245__ $$aThe barley mutant emr2 shows enhanced resistance against several fungal leaf pathogens
000001650 260__ $$aOxford [u.a.]$$bWiley-Blackwell$$c2009
000001650 300__ $$a124 - 129
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000001650 500__ $$aThe authors are very grateful to Prof. A. J. Slusarenko for helpful discussion on the segregation analysis and for critical reading of the manuscript. Prof. J. Leon is kindly acknowledged for the multiplication of barley cultivars and mutants. We thank Dr J.- B. Speakman, BASF, Ludwigshafen, Germany for assistance with Drechslera teres and Rhynchosporium secalis. MJ was supported temporarily by a grant of the RWTH Aachen University.
000001650 520__ $$aHomozygous mlo-barley plants are resistant to barley powdery mildew but hypersusceptible to the rice blast fungus Magnaporthe oryzae. A mutational analysis was performed in the barley back-cross line BCIngrid mlo5 which led to the identification of two mutants with enhanced capacity to resist infections by M. oryzae, referred to as enhanced M. oryzae resistance mutants emr1 and emr2. Here, we report on the characterization of emr2 mutant plants which not only show an almost complete reduction in disease severity after inoculation with M. oryzae but are also resistant to the necrotrophic fungi Drechslera teres and Rhynchosporium secalis. Histological analysis revealed that resistance to M. oryzae was based mainly on the formation of papillae at sites of attempted penetration into epidermal cells. There was no progression of fungal growth into the mesophyll. Additionally, because of the presence of the mlo-allele, emr2-plants retained resistance to powdery mildew. The emr2-conditioned broad spectrum resistance was inherited as in a recessive manner. Monitoring of PR-gene expression and enzymatic activity of peroxidases revealed a constitutively activated defence in emr2.
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000001650 65320 $$2Author$$aBlumeria graminis f
000001650 65320 $$2Author$$asp
000001650 65320 $$2Author$$ahordei
000001650 65320 $$2Author$$aRhynchosporium secalis
000001650 65320 $$2Author$$aDrechslera teres
000001650 65320 $$2Author$$aperoxidase
000001650 65320 $$2Author$$aBarley
000001650 65320 $$2Author$$aconstitutive resistance
000001650 65320 $$2Author$$ahypersensitive response
000001650 65320 $$2Author$$apapilla
000001650 7001_ $$0P:(DE-HGF)0$$aSchaffrath, U.$$b1
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000001650 8567_ $$uhttp://dx.doi.org/10.1111/j.1439-0523.2008.01604.x
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