The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Anne E. Ashford - One of the best experts on this subject based on the ideXlab platform.
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Apoplastic permeability of sclerotia of Sclerotium rolfsii, Sclerotium cepivorum and Rhizoctonia solani
New Phytologist, 1995Co-Authors: Nicola Young, Anne E. AshfordAbstract:summary Intact mature sclerotia of Sclerotium rolfsii sacc, and Sclerotium cepivorum Berk, produced in culture are impermeable to the apoplastic tracer sulphorhodamine G. Both of these species produce sclerotia with rinds. Some movement of sulphorhodamine into sclerotia of Rhizoctonia solani Kuhn, which have no rind, occurred but the fluorochrome was arrested after permeation of at most the outer five layers of cells. In all cases, low permeability depended on an intact outer layer, and when sclerotia of each species were bisected to provide direct access of sulphorhodamine to all tissue layers, the fluorochrome permeated the cell walls and extracellular matrix (where present) of many cells within the Sclerotium. A marked reduction in permeability of intact sclerotia occurs at maturity in a number of species and might he important in long-term Survival.
Jean C. Batzer - One of the best experts on this subject based on the ideXlab platform.
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Phylogenetic placement of plant pathogenic Sclerotium species among teleomorph genera
Mycologia, 2010Co-Authors: Thomas C. Harrington, Mark L. Gleason, Jean C. BatzerAbstract:Phylogenetic analyses and morphological characteristics were used to assess the taxonomic placement of eight plant-pathogenic Sclerotium spe- cies. Members of this genus produce only sclerotia and no fruiting bodies or spores, so Sclerotium species have been difficult to place taxonomically. Sequences of rDNA large subunit (LSU) and internal transcribed spacer (ITS) regions were determined for isolates of Sclerotium cepivorum, S. coffeicola, S. denigrans, S. hydrophilum, Ceratorhiza oryzae-sativae, S. perniciosum, S. rhizodes, S. rolfsii and S. rolfsii var. delphinii. Parsimony analysis grouped two species previously thought to be in the Basidiomycota, S. denigrans and S. perniciosum, within the Ascomycota; these species were found to have affinities with the teleomorph genera Sclerotinia and Stromatinia and the asexual Sclerotium cepivorum, which was known earlier to be related to Sclerotinia species. The other Sclerotium species were placed in one of two basidiomycetous groups, genera Athelia or Ceratobasidium. Based on rDNA analysis and morphology the basidiomycetous Sclerotium hydrophilum and S. rhizodes were trans- ferred to genus Ceratorhiza, the anamorph of Ceratobasidium species. Sclerotium coffeicola was found to be close to S. rolfsii var. delphinii and S. rolfsii var. rolfsii, which was shown earlier to have an Athelia teleomorph.
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Short title: Sclerotium species Phylogenetic placement of plant pathogenic Sclerotium species among teleomorph genera
2009Co-Authors: Thomas C. Harrington, Mark L. Gleason, Jean C. BatzerAbstract:Phylogenetic analyses and morphological characteristics were used to assess the taxonomic placement of eight plant-pathogenic Sclerotium species. Members of this genus produce only sclerotia and no fruiting bodies or spores, so Sclerotium species have been difficult to place taxonomically. Sequences of rDNA large subunit (LSU) and internal transcribed spacer (ITS) regions were determined for isolates of Sclerotium cepivorum, S. coffeicola, S. denigrans, S. hydrophilum, Ceratorhiza oryzae-sativae, S. perniciosum, S. rhizodes, S. rolfsii and S. rolfsii var. delphinii. Parsimony analysis grouped two species previously thought to be in the Basidiomycota, S. denigrans and S. perniciosum, within the Ascomycota; these species were found to have affinities with the teleomorph genera Sclerotinia and Stromatinia and the asexual Sclerotium ceprivorum, which was known earlier to be related to Sclerotinia species. The other Sclerotium species were placed in one of two basidiomycetous groups, genera Athelia or Ceratobasidium. Based on rDNA analysis and morphology the basidiomycetous Sclerotium hydrophilum and S. rhizodes were transferred to genus Ceratorhiza, the anamorph of Ceratobasidium species. Sclerotium coffeicola was found to be close to S.
Nicola Young - One of the best experts on this subject based on the ideXlab platform.
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Apoplastic permeability of sclerotia of Sclerotium rolfsii, Sclerotium cepivorum and Rhizoctonia solani
New Phytologist, 1995Co-Authors: Nicola Young, Anne E. AshfordAbstract:summary Intact mature sclerotia of Sclerotium rolfsii sacc, and Sclerotium cepivorum Berk, produced in culture are impermeable to the apoplastic tracer sulphorhodamine G. Both of these species produce sclerotia with rinds. Some movement of sulphorhodamine into sclerotia of Rhizoctonia solani Kuhn, which have no rind, occurred but the fluorochrome was arrested after permeation of at most the outer five layers of cells. In all cases, low permeability depended on an intact outer layer, and when sclerotia of each species were bisected to provide direct access of sulphorhodamine to all tissue layers, the fluorochrome permeated the cell walls and extracellular matrix (where present) of many cells within the Sclerotium. A marked reduction in permeability of intact sclerotia occurs at maturity in a number of species and might he important in long-term Survival.
R. C. Agu - One of the best experts on this subject based on the ideXlab platform.
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Composition and food value of Sclerotium (Osu) and edible mushroom (Pleurotus tuber-regium)
Journal of Food Science and Technology-mysore, 2001Co-Authors: C. M. Ude, A. E. N. Ezenwugo, R. C. AguAbstract:The composition and food value of edible mushroom (Pleurotus tuber-regium) and the Sclerotium or tuber (osu) from which the mushroom was grown showed that the latter (Sclerotium) was a richer source of most of the food nutrients assessed than the former (mushroom). The Sclerotium was found to be a rich source of proteins, fat, crude fibre, minerals and carbohydrates. When compared with some of the other important food materials widely consumed in Nigeria, such as root tubers (cassava and yam) or cereals (maize, sorghum and rice), the mushrrom (P. tuber-regium) and the tuber (Sclerotium) contained a wider range of food nutrients than those of the root tuber and cereal, indicating that P. tuber-regium and the Sclerotium had a more balanced food value. The fungus could, therefore, be a cheap source of proteins for many Nigerians who may not afford proteins in their diets from the more commonly known but expensive sources of proteins such as beef or eggs.
K.a. Abada - One of the best experts on this subject based on the ideXlab platform.
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Fungi causing damping-off and root-rot on sugar-beet and their biological control with Trichoderma harzianum
Agriculture Ecosystems & Environment, 1994Co-Authors: K.a. AbadaAbstract:Abstract Isolation trials from rotted sugar-beet roots collected in Egypt (Kafr El-Shikh governorate) yielded: Alternaria spp.; Mucor spp.; Fusarium spp., F. conglutinans, F. solani; Phoma (Pleospora) betae; Pythium debaryanum; Rhizoctonia solani; Scleorotium bataticola; Sclerotium rolfsii (the sclerotial state of Athelia rolfsii) and Trichoderma harzianum. All the isolated fungi were pathogenic except the antagonistic fungus, i.e. T. harzianum. The efficiency of Trichoderma as a biocontrol agent against fungi causing damping-off and root-rot was investigated in pot and field experiments. T. harzianum caused a great reduction in the infection level of damping-off and root-rot diseases, and resulted in increased root weight both in pot aand field experiments during two successive growing seasons.
