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- 저자 : ( David M. Weller ) (검색결과 5 건)
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Take-all of Wheat and Natural Disease Suppression: A Review
곽연식,David M. Weller 한국식물병리학회 2013 Plant Pathology Journal Vol.29 No.2
In agro-ecosystems worldwide, some of the most important and devastating diseases are caused by soil-borne necrotrophic fungal pathogens, against which crop plants generally lack genetic resistance. However, plants have evolved approaches to protect themselves against pathogens by stimulating and supporting specific groups of beneficial microorganisms that have the ability to protect either by direct inhibition of the pathogen or by inducing resistance mechanisms in the plant. One of the best examples of protection of plant roots by antagonistic microbes occurs in soils that are suppressive to takeall disease of wheat. Take-all, caused by Gaeumannomyces graminis var. tritici, is the most economically important root disease of wheat worldwide. Take-all decline (TAD) is the spontaneous decline in incidence and severity of disease after a severe outbreak of takeall during continuous wheat or barley monoculture. TAD occurs worldwide, and in the United States and The Netherlands it results from a build-up of populations of 2,4-diacetylphloroglucinol (2,4-DAPG)-producing fluorescent Pseudomonas spp. during wheat monoculture. The antibiotic 2,4-DAPG has a broad spectrum of activity and is especially active against the take-all pathogen. Based on genotype analysis by repetitive sequence-based-PCR analysis and restriction fragment length polymorphism of phlD, a key 2,4-DAPG biosynthesis gene, at least 22 genotypes of 2,4-DAPG producing fluorescent Pseudomonas spp. have been described worldwide. In this review, we provide an overview of G. graminis var. tritici, the take-all disease, Pseudomonas biocontrol agents, and mechanism of disease suppression.
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Take-all of Wheat and Natural Disease Suppression: A Review
Kwak, Youn-Sig,Weller, David M. The Korean Society of Plant Pathology 2013 Plant Pathology Journal Vol.29 No.2
In agro-ecosystems worldwide, some of the most important and devastating diseases are caused by soil-borne necrotrophic fungal pathogens, against which crop plants generally lack genetic resistance. However, plants have evolved approaches to protect themselves against pathogens by stimulating and supporting specific groups of beneficial microorganisms that have the ability to protect either by direct inhibition of the pathogen or by inducing resistance mechanisms in the plant. One of the best examples of protection of plant roots by antagonistic microbes occurs in soils that are suppressive to take-all disease of wheat. Take-all, caused by Gaeumannomyces graminis var. tritici, is the most economically important root disease of wheat worldwide. Take-all decline (TAD) is the spontaneous decline in incidence and severity of disease after a severe outbreak of take-all during continuous wheat or barley monoculture. TAD occurs worldwide, and in the United States and The Netherlands it results from a build-up of populations of 2,4-diacetylphloroglucinol (2,4-DAPG)-producing fluorescent Pseudomonas spp. during wheat monoculture. The antibiotic 2,4-DAPG has a broad spectrum of activity and is especially active against the take-all pathogen. Based on genotype analysis by repetitive sequence-based-PCR analysis and restriction fragment length polymorphism of phlD, a key 2,4-DAPG biosynthesis gene, at least 22 genotypes of 2,4-DAPG producing fluorescent Pseudomonas spp. have been described worldwide. In this review, we provide an overview of G. graminis var. tritici, the take-all disease, Pseudomonas biocontrol agents, and mechanism of disease suppression.
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( Sang Dal Kim ),( Leonardo De La Fuente ),( David M. Weller ),( Linda S. Thomashow ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.6
Pseudomonas fluorescens 2112, isolated in Korea as an indigenous antagonistic bacteria, can produce 2,4- diacetylphloroglucinol (2,4-DAPG) and the siderophore pyoveridin2112 for the control of phytophthora blight of red-pepper. P. fluorescens 2112 was classified into a new genotype C among the 17 genotypes of 2,4-DAPG producers, by phlD restriction fragment length polymorphism (RFLP). The colonizing ability of P. fluorescens 2112 in pea rhizosphere was equal to the well-known pea colonizers, P. fluorescens Q8r1 (genotype D) and MVP1-4 (genotype P), after 6 cycling cultivations for 18 weeks. Four tested 2,4- DAPG-producing Pseudomonas spp. could colonize with about a 96% dominance ratio against total bacteria in pea rhizosphere. The strain P. fluorescens 2112 was as good a colonizer as other Pseudomonas spp. genotypes in pea plant growth-promoting rhizobacteria.
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Kwon, Young Sang,Jeon, Chang-Wook,Bae, Dong-Won,Seo, Jong-Su,Thomashow, Linda S.,Weller, David M.,Kwak, Youn-Sig Elsevier 2018 Fungal biology Vol.122 No.11
<P><B>Abstract</B></P> <P>Take-all disease, caused by <I>Gaeumannomyces graminis</I> var. <I>tritici</I> (<I>Ggt</I>), is one of the most serious root diseases in wheat production. In this study, a proteomic platform based on 2-dimensional gel electrophoresis (2-DE) and Matrix-Assisted Laser Desorption/Ionization Time of Flight Tandem Mass Spectrometry (MALDI-TOF/TOF MS) was used to construct the first proteome database reference map of <I>G. graminis</I> var. <I>tritici</I> and to identify the response of the pathogen to 2,4-diacetylphloroglucinol (DAPG), which is a natural antibiotic produced by antagonistic <I>Pseudomonas</I> spp. in take-all suppressive soils. For mapping, a total of 240 spots was identified that represented 209 different proteins. The most abundant biological function categories in the <I>Ggt</I> proteome were related to carbohydrate metabolism (21%), amino acid metabolism (15%), protein folding and degradation (12%), translation (11%), and stress response (10%). In total, 51 <I>Ggt</I> proteins were affected by DAPG treatment. Based on gene ontology, carbohydrate metabolism, amino acid metabolism, stress response, and protein folding and degradation proteins were the ones most modulated by DAPG treatment. This study provides the first extensive proteomic reference map constructed for <I>Ggt</I> and represents the first time that the response of <I>Ggt</I> to DAPG has been characterized at the proteomic level.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Take-all disease, caused by <I>Ggt</I>, is one of the most serious diseases in wheat production. </LI> <LI> This study reports the first proteomic map of the <I>Ggt</I>, which we have identified 240 proteins. </LI> <LI> DAPG is produced by <I>Pseudomonas</I> spp. and is the key element in disease suppression. </LI> <LI> Up-regulated proteins induced by DAPG are related to xenobiotic detoxification and antioxidant. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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