Morphology and host range of Polymyxa graminis, Polymyxa.
Soil Morphology, Formation and Classification - (JJ400). Organism descriptor(s): Polymyxa betae polymyxa betae Subject Category: Organism Names see more details. Descriptor(s): plant pathology plant pathology Subject Category: Disciplines, Occupations and Industries see more details. Identifier(s): details, phytopathology, Plasmodiophoraceae Geographical Location(s): Canada canada.
Interactions between Polymyxa betae and plant systemic.
Polymyxa betae is not a serious threat to crops, but as the vector of rhizomania disease of sugar beet it is of great significance. Rhizomania disease causes severe yield losses in sugar beet, leading to crop yields per hectare of 2-3 tonnes instead of 8-10 tonnes (Putz et al., 1990). The economic impact has lessened in some areas where partially resistant cultivars of sugar beet can be used.
Studies on the life-cycle of Polymyxa betae in sugar beet.
The fungus Polymyxa betae Keskin belongs to the family Plasmodiophoraceae and lives in the soil as an obligatory parasite of the roots of the Chenopodiaceae. When contaminated by beet necrotic yellow vein virus, this viruliferous fungus causes a serious disease of sugar beet known as rhizomania, whereas the infection by the fungus alone (aviruliferous fungus) causes only slight damage to the.
The biology and molecular biology of Polymyxa species and.
Paenibacillus polymyxa, also known as Bacillus polymyxa, is a Gram-positive bacterium capable of fixing nitrogen.It is found in soil, plant tissues and marine sediments. It may have a role in forest ecosystems and potential future applications as a biofertilizer and biocontrol agent in agriculture.
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Polymyxa betae, Beet rhizomania (INRA) Beet rhizomania Proliferation beet rootlets produced by rhizomania. Beet necrotic yellow vein virus, BNYVV (INRA) Beet rhizomania Shrivelling and discolouration along the veins of an infected leaf of beet by rhizomania. To read this page in French. HYP3 on line: Species (scientific name), Diseases (common names), Glossary, Crops. back to HYPP Pathology.
A new phenotype of Polymyxa betae in Arabidopsis thaliana.
The fungus was present in 85% of soil samples examined from 59 beet fields, this being the first record of P. betae from Ireland. It was not observed in the roots of beet plants growing in the field, probably owing to unfavourable environmental conditions during 1984.
Evidence that Polymyxa species may infect Arabidopsis.
Polymyxa graminis is a species of plasmodiophorid cercozoans.It is an obligate parasite of plant roots and, though itself non-pathogenic, is responsible for the transmission of several very important plant viruses, including barley yellow mosaic virus (BaYMV) and soil-borne wheat mosaic virus (SBWMV).
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Light and electron microscopy was used to study the development of Polymyxa betae, the plasmodiophoromycete vector of beet necrotic yellow vein virus, in Beta vulgaris seedling roots. A triple staining technique (methylene blue — azure II — basic fuchsin) discriminated host-plant and fungal material and revealed changes in fungal constituents during development.
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Polymyxa betae is the vector of Beet necrotic yellow vein virus (BNYVV), the causal agent of sugar beet rhizomania disease. Because of the widespread use of cultivars partially resistant to BNYVV, resistance breaking BNYVV isolates have been reported. In order to develop alternative control strategies, we investigated interactions between P. betae and plant defenses. A first set of bioassays.
Confirmation of Polymyxa graminis as a Vector of Wheat.
Polymyxa graminis and Polymyxa betae are obligate, intracellular, root-infecting organisms of cereals (P. graminis) and members of the Chenopodiacae (P. betae). Between the two species, they transmit approximately 15 economically important plant viruses. These include Soil-borne cereal mosaic virus, Barley yellow mosaic virus and Beet necrotic yellow vein virus and together, cover a world-wide.
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The fungus Polymyxa betae is an obligate parasite of the roots of many plants of the family Chenopodiaceae. In the sugar beet, it acts as a vector of beet necrotic yellow vein virus, the agent of a serious disease known as rhizomania. With indirect methods of analysis, such as bioassay, one can establish only the presence or absence, but not the quantity, of.
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Both Polymyxa graminis and Polymyxa betae were identified. This is the first report of infection of Arabidopsis by Polymyxa spp. and shows the possibility of using this system for studies of infection biology and host-parasite interactions. Polymyxa graminis, Polymyxa betae, soil-borne cereal mosaic virus, Arabidopsis, Plasmodiophorida. Introduction. Polymyxa spp. are a group of obligate root.