Soil suppressiveness to Rhizoctonia solani and microbial diversity. 2005

Y Bakker, and F M J Van Loon, and J H M Schneider
Institute of Sugar Beet Research (IRS), Van Konijnenburgweg 24, NL-4611 HL Bergen op Zoom, The Netherlands.

Rhizoctonia solani anastomosis group 2-2IIIB causes damping-off, black root rot and crown rot in sugar beet (Beta vulgaris). Based on experiences of growers and field experiments, soils can become suppressive to R. solani. The fungus may be present in the soil, but the plant does not show symptoms. Understanding the mechanisms causing soil suppressiveness to R. solani is essential for the development of environmentally friendly control strategies of rhizoctonia root rot in sugar beet. A bioassay that discriminates soils in their level of disease suppressiveness was developed. Results of bioassays were in accordance with field observations. Preliminary results indicate an active role of microbial communities. Our research is focused on the disentanglement of biological mechanisms causing soil suppressiveness to R. solani in sugar beet. Therefore, we are handling a multidisciplinary approach through experimental fields, bioassays, several in vitro techniques and molecular techniques (PCR-DGGE).

UI MeSH Term Description Entries
D010572 Pest Control, Biological Use of naturally-occuring or genetically-engineered organisms to reduce or eliminate populations of pests. Biological Pest Control,Biologic Pest Control,Pest Control, Biologic,Biologic Pest Controls,Biological Pest Controls,Pest Controls, Biologic,Pest Controls, Biological
D010935 Plant Diseases Diseases of plants. Disease, Plant,Diseases, Plant,Plant Disease
D000898 Antibiosis A natural association between organisms that is detrimental to at least one of them. This often refers to the production of chemicals by one microorganism that is harmful to another. Bacterial Interference,Microbial Antagonism,Interference, Bacterial,Antagonism, Microbial,Antagonisms, Microbial,Antibioses,Bacterial Interferences,Interferences, Bacterial,Microbial Antagonisms
D001681 Biological Assay A method of measuring the effects of a biologically active substance using an intermediate in vivo or in vitro tissue or cell model under controlled conditions. It includes virulence studies in animal fetuses in utero, mouse convulsion bioassay of insulin, quantitation of tumor-initiator systems in mouse skin, calculation of potentiating effects of a hormonal factor in an isolated strip of contracting stomach muscle, etc. Bioassay,Assay, Biological,Assays, Biological,Biologic Assay,Biologic Assays,Assay, Biologic,Assays, Biologic,Bioassays,Biological Assays
D012232 Rhizoctonia A mitosporic Ceratobasidiaceae fungal genus that is an important plant pathogen affecting potatoes and other plants. There are numerous teleomorphs. Rhizoctonias
D012988 Soil Microbiology The presence of bacteria, viruses, and fungi in the soil. This term is not restricted to pathogenic organisms. Microbiology, Soil
D018407 Bacterial Physiological Phenomena Physiological processes and properties of BACTERIA. Bacterial Physiology,Bacterial Processes,Bacterial Physiological Concepts,Bacterial Physiological Phenomenon,Bacterial Process,Physiology, Bacterial,Bacterial Physiological Concept,Concept, Bacterial Physiological,Concepts, Bacterial Physiological,Phenomena, Bacterial Physiological,Phenomenon, Bacterial Physiological,Process, Bacterial,Processes, Bacterial
D018517 Plant Roots The usually underground portions of a plant that serve as support, store food, and through which water and mineral nutrients enter the plant. (From American Heritage Dictionary, 1982; Concise Dictionary of Biology, 1990) Plant Bulbs,Plant Root,Bulb, Plant,Bulbs, Plant,Plant Bulb,Root, Plant,Roots, Plant
D027461 Beta vulgaris A species of the Beta genus. Cultivars are used as a source of beets (root) or chard (leaves). Beets,Chard,Beet,Beta vulgari,Chards,vulgari, Beta

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