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Keizo Katsuya - One of the best experts on this subject based on the ideXlab platform.
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In situ and in vitro specificity between Rhizoctonia spp. and Spiranthes sinensis (Persoon) Ames, var. amoena (M. Bieberstein) Hara (Orchidaceae)
New Phytologist, 1994Co-Authors: Gaku Masuhara, Keizo KatsuyaAbstract:The relationships between the orchid Spiranthes sinensis (Persoon) Ames. var. amoena (M. Bieberstein) Hara and Rhizoctonia spp. were investigated in situ at germination and in adult plants. Seeds of the orchid placed in cotton gauze were buried at 210 sampling points in turf grassland, the orchid habitat (in situ germination). Eight weeks later, protocorm development of the orchid was confirmed at 67 of the 210 sampling points. Isolation of fungi from protocorms showed that in situ germination was induced mainly by Rhizoctonia repens Bernard. Similarly, R. repens was the dominant mycorrhizal fungus isolated from roots of adult plants. The number of adult plants within a radius of either 30 or 50 cm of burial points did not influence seed germination. The distribution of Rhizoctonia spp. other than R. repens in the sample site was examined with a baiting method using buckwheat stems. Thirty-two isolates consisting of binucleate Rhizoctonia anastomosis group (AG)-A, AGB, AG-G, and AG-I, R. solani Kuhn AG-4, Waitea circinata Warcup and: Talbot, which anastomozed with WAG-O and WAG-Z, and a multinucleate Rhizoctonia sp. were isolated. Three AG-G isolates were obtained from the points at which protocorm development was induced by R. repens. Seeds of S. sinensis var. amoena were inoculated in vitro with these isolates to test for symbiotic germination. Most Rhizoctonia spp. not associated with the germination in situ induced seed germination in vitro. Seedlings which developed with these isolates in vitro were transferred to ex vitro conditions. New leaves developed and elongated as seedlings continued to grow for 3 months. The seed burial method enabled the clarification of the differences in orchid-fungal specificity in situ and in vitro. We concluded that the specificity between S. sinensis var. amoena and fungi in situ conditions was different to that in vitro.
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Potential for symbiosis of Rhizoctonia solani and binucleate Rhizoctonia with seeds of Spiranthes sinensis var. amoena in vitro
Fungal Biology, 1993Co-Authors: Gaku Masuhara, Keizo Katsuya, Kentaro YamaguchiAbstract:Rhizoctonia isolates obtained from non-orchid sources were tested for symbiotic ability with seeds of Spiranthes sinensis var. amoena in vitro . All or some isolates of Rhizoctonia solani anastomosis group (AG)-1, AG-2-1, AG-2-2, AG-3, AG-4, AG-5, AG-6, AG-7, AG-8, and AG-BI induced symbiotic germination of the orchid seeds. In binucleate Rhizoctonia anastomosis groups, also all or some isolates of AG-A, AG-Ba, AG-Bb, AG-B, AG-C, AG-D, AG-E, AG-F, AG-G, AG-H, AG-I, AG-K, AG-L, AG-M, AG-O, AG-P and AG-Q, induced the symbiotic germination. However, no germination occurred when the seeds were inoculated with Sebacina vermifera ( R. globularis ) and Waitea circinata ( R. zeae , and R. oryzae ) in vitro .
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Potential for symbiosis of Rhizoctonia solani and binucleate Rhizoctonia with seeds of Spiranthes sinensis var. amoena in vitro
Mycological Research, 1993Co-Authors: Gaku Masuhara, Keizo Katsuya, Kentaro YamaguchiAbstract:Rhizoctonia isolates obtained from non-orchid sources were tested for symbiotic ability with seeds of Spiranthes sinensis var. amoena in vitro. All or some isolates of Rhizoctonia solani anastomosis group (AG)-1, AG-2-1, AG-2-2, AG-3, AG-4, AG-5, AG-6, AG-7, AG-8, and AG-BI induced symbiotic germination of the orchid seeds. In binucleate Rhizoctonia anastomosis groups, also all or some isolates of AG-A, AG-Ba, AG-Bb, AG-B, AG-C, AG-D, AG-E, AG-F, AG-G, AG-H, AG-I, AG-K, AG-L, AG-M, AG-O, AG-P and AG-Q, induced the symbiotic germination. However, no germination occurred when the seeds were inoculated with Sebacina vermifera (R. globularis) and Waitea circinata (R. zeae, and R. oryzae) in vitro. © 1993, British Mycological Society. All rights reserved.
C. A. Bradley - One of the best experts on this subject based on the ideXlab platform.
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Rhizoctonia solani: Taxonomy, population biology and management of Rhizoctonia seedling disease of soybean
Plant Pathology, 2017Co-Authors: Olutoyosi O. Ajayi-oyetunde, C. A. BradleyAbstract:Rhizoctonia solani, the most important species within the genus Rhizoctonia, is a soilborne plant pathogen with considerable diversity in cultural morphology, host range and aggressiveness. Despite its history as a destructive pathogen of economically important crops worldwide, our understanding of its taxonomic relationship with other Rhizoctonia-like fungi, incompatibility systems, and population biology is rather limited. Among the host of diseases it has been associated with, seedling diseases inflicted on soybean are of significant importance, especially in the soybean growing regions of North America. Due to the dearth of resistant soybean genotypes, as well as the paucity of information on the mechanisms of host–pathogen interactions and other molecular aspects of pathogenicity, effective management options have mostly relied upon a combination of cultural and chemical control options. The first section of this review summarizes what is currently known about the taxonomy and systematics, population biology and molecular genetics of R. solani. The second section provides an overview of the pathology and management of Rhizoctonia root and hypocotyl rot of soybean, a seedling disease of importance in North America.
Gaku Masuhara - One of the best experts on this subject based on the ideXlab platform.
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In situ and in vitro specificity between Rhizoctonia spp. and Spiranthes sinensis (Persoon) Ames, var. amoena (M. Bieberstein) Hara (Orchidaceae)
New Phytologist, 1994Co-Authors: Gaku Masuhara, Keizo KatsuyaAbstract:The relationships between the orchid Spiranthes sinensis (Persoon) Ames. var. amoena (M. Bieberstein) Hara and Rhizoctonia spp. were investigated in situ at germination and in adult plants. Seeds of the orchid placed in cotton gauze were buried at 210 sampling points in turf grassland, the orchid habitat (in situ germination). Eight weeks later, protocorm development of the orchid was confirmed at 67 of the 210 sampling points. Isolation of fungi from protocorms showed that in situ germination was induced mainly by Rhizoctonia repens Bernard. Similarly, R. repens was the dominant mycorrhizal fungus isolated from roots of adult plants. The number of adult plants within a radius of either 30 or 50 cm of burial points did not influence seed germination. The distribution of Rhizoctonia spp. other than R. repens in the sample site was examined with a baiting method using buckwheat stems. Thirty-two isolates consisting of binucleate Rhizoctonia anastomosis group (AG)-A, AGB, AG-G, and AG-I, R. solani Kuhn AG-4, Waitea circinata Warcup and: Talbot, which anastomozed with WAG-O and WAG-Z, and a multinucleate Rhizoctonia sp. were isolated. Three AG-G isolates were obtained from the points at which protocorm development was induced by R. repens. Seeds of S. sinensis var. amoena were inoculated in vitro with these isolates to test for symbiotic germination. Most Rhizoctonia spp. not associated with the germination in situ induced seed germination in vitro. Seedlings which developed with these isolates in vitro were transferred to ex vitro conditions. New leaves developed and elongated as seedlings continued to grow for 3 months. The seed burial method enabled the clarification of the differences in orchid-fungal specificity in situ and in vitro. We concluded that the specificity between S. sinensis var. amoena and fungi in situ conditions was different to that in vitro.
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Potential for symbiosis of Rhizoctonia solani and binucleate Rhizoctonia with seeds of Spiranthes sinensis var. amoena in vitro
Fungal Biology, 1993Co-Authors: Gaku Masuhara, Keizo Katsuya, Kentaro YamaguchiAbstract:Rhizoctonia isolates obtained from non-orchid sources were tested for symbiotic ability with seeds of Spiranthes sinensis var. amoena in vitro . All or some isolates of Rhizoctonia solani anastomosis group (AG)-1, AG-2-1, AG-2-2, AG-3, AG-4, AG-5, AG-6, AG-7, AG-8, and AG-BI induced symbiotic germination of the orchid seeds. In binucleate Rhizoctonia anastomosis groups, also all or some isolates of AG-A, AG-Ba, AG-Bb, AG-B, AG-C, AG-D, AG-E, AG-F, AG-G, AG-H, AG-I, AG-K, AG-L, AG-M, AG-O, AG-P and AG-Q, induced the symbiotic germination. However, no germination occurred when the seeds were inoculated with Sebacina vermifera ( R. globularis ) and Waitea circinata ( R. zeae , and R. oryzae ) in vitro .
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Potential for symbiosis of Rhizoctonia solani and binucleate Rhizoctonia with seeds of Spiranthes sinensis var. amoena in vitro
Mycological Research, 1993Co-Authors: Gaku Masuhara, Keizo Katsuya, Kentaro YamaguchiAbstract:Rhizoctonia isolates obtained from non-orchid sources were tested for symbiotic ability with seeds of Spiranthes sinensis var. amoena in vitro. All or some isolates of Rhizoctonia solani anastomosis group (AG)-1, AG-2-1, AG-2-2, AG-3, AG-4, AG-5, AG-6, AG-7, AG-8, and AG-BI induced symbiotic germination of the orchid seeds. In binucleate Rhizoctonia anastomosis groups, also all or some isolates of AG-A, AG-Ba, AG-Bb, AG-B, AG-C, AG-D, AG-E, AG-F, AG-G, AG-H, AG-I, AG-K, AG-L, AG-M, AG-O, AG-P and AG-Q, induced the symbiotic germination. However, no germination occurred when the seeds were inoculated with Sebacina vermifera (R. globularis) and Waitea circinata (R. zeae, and R. oryzae) in vitro. © 1993, British Mycological Society. All rights reserved.
Olutoyosi O. Ajayi-oyetunde - One of the best experts on this subject based on the ideXlab platform.
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Rhizoctonia solani: taxonomy, population biology and management of Rhizoctonia seedling disease of soybean
Plant Pathology, 2017Co-Authors: Olutoyosi O. Ajayi-oyetunde, Carl A. BradleyAbstract:Rhizoctonia solani Kuhn, the most important species within the genus Rhizoctonia, is a soil-borne plant pathogen with considerable diversity in cultural morphology, host range, and aggressiveness. Despite its history as a destructive pathogen of economically important crops world-wide, our understanding of its taxonomic relationship with other Rhizoctonia-like fungi, incompatibility systems, and population biology is rather limited. Among the host of diseases it has been associated with, seedling diseases inflicted on soybean are of significant importance, especially in the soybean growing regions of North America. Due to the dearth of resistant soybean genotypes, as well as the paucity of information on the mechanisms of host-pathogen interactions and other molecular aspects of pathogenicity, effective management options have mostly relied upon a combination of cultural and chemical control options. The first section of this review summarizes what is currently known about the taxonomy and systematics, population biology, and molecular genetics of R. solani. The second section provides an overview of the pathology and management of Rhizoctonia root and hypocotyl rot of soybean, a seedling disease of importance in North America. This article is protected by copyright. All rights reserved.
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Rhizoctonia solani: Taxonomy, population biology and management of Rhizoctonia seedling disease of soybean
Plant Pathology, 2017Co-Authors: Olutoyosi O. Ajayi-oyetunde, C. A. BradleyAbstract:Rhizoctonia solani, the most important species within the genus Rhizoctonia, is a soilborne plant pathogen with considerable diversity in cultural morphology, host range and aggressiveness. Despite its history as a destructive pathogen of economically important crops worldwide, our understanding of its taxonomic relationship with other Rhizoctonia-like fungi, incompatibility systems, and population biology is rather limited. Among the host of diseases it has been associated with, seedling diseases inflicted on soybean are of significant importance, especially in the soybean growing regions of North America. Due to the dearth of resistant soybean genotypes, as well as the paucity of information on the mechanisms of host–pathogen interactions and other molecular aspects of pathogenicity, effective management options have mostly relied upon a combination of cultural and chemical control options. The first section of this review summarizes what is currently known about the taxonomy and systematics, population biology and molecular genetics of R. solani. The second section provides an overview of the pathology and management of Rhizoctonia root and hypocotyl rot of soybean, a seedling disease of importance in North America.
B Sneh - One of the best experts on this subject based on the ideXlab platform.
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Classification of Rhizoctonia spp. using rDNA-ITS sequence analysis supports the genetic basis of the classical anastomosis grouping
Mycoscience, 2008Co-Authors: Michal Sharon, Mitsuro Hyakumachi, Shiro Kuninaga, Shigeo Naito, B SnehAbstract:Currently, rDNA-ITS sequence analysis seems to be the most appropriate method for comprehensive classification of Rhizoctonia spp. Our previous review article was concerned with detailed analysis of multinucleate Rhizoctonia (MNR), and the current review complements the previous one with detailed analysis of binucleate Rhizoctonia (BNR) (teleomorphs: Ceratobasidium spp. and Tulasnella spp.) and uninucleate Rhizoctonia (UNR) (teleomorph: C. bicorne ). Data of all the appropriate BNR and UNR accumulated in GenBank were analyzed together in neighbor-joining (NJ) trees supplemented with percent sequence similarity within and among the anastomosis groups (AGs) and subgroups. Generally, the clusters of the isolate sequences supported the genetic basis for the AG based on hyphal fusion anastomosis. Comprehensive interrelationships among all the currently available MNR, BNR, and UNR groups and subgroups in GenBank were subsequently analyzed in NJ and maximum-parsimony (MP) trees, showing the genetic relatedness among the different groups and indicating possible bridging groups between MNR, BNR, and UNR. The review also indicates serious inaccuracies in designation of sequences of some isolates deposited in GenBank. Several additional teleomorph genera with Rhizoctonia spp. anamorphs have also been reported in the literature. However, as they have not been intensively studied, there were no available data on their rDNA-ITS sequences that could be included in this review.
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The advancing identification and classification of Rhizoctonia spp. using molecular and biotechnological methods compared with the classical anastomosis grouping
Mycoscience, 2006Co-Authors: Michal Sharon, Mitsuro Hyakumachi, Shiro Kuninaga, B SnehAbstract:Anamorphic classification of Rhizoctonia spp. has been based on young cell nuclear numbers and hyphal fusion to anastomosis groups (AGs), in addition to the teleomorph classification. The widespread development of molecular biology techniques has added modern tools to support classification of organisms according to their genetics and evolutionary processes. These various methods have also been used in recent years for classification of Rhizoctonia. Data are continuously accumulating in the literature and the sequences in databases, which are readily available for researchers in the network systems. In the present review, attempts were made to describe and compare the advantages and disadvantages of the various methods for the classification of Rhizoctonia spp. Currently, the rDNA-internal transcribed spacer (ITS) sequence analysis seems to be the most appropriate method for classification of Rhizoctonia spp. Data of all the appropriate multinucleate Rhizoctonia (MNR) accumulated in GenBank were analyzed together in neighbor-joining (NJ) and maximum-parsimony (MP) trees supplemented with percent sequence similarity within and among AGs and subgroups. Generally, the clusters of the isolate sequences were supportive of the AGs and subgroups based on hyphal fusion anastomosis. The review also indicates inaccuracies in designation of sequences of some isolates deposited in GenBank. The review includes detailed analyses of the MNR groups and subgroups, whereas complementary descriptions of the binucleate Rhizoctonia (BNR), uninucleate Rhizoctonia (UNR), and comprehensive interrelationships among all the currently available MNR, BNR, and UNR groups and subgroups in GenBank are to be discussed in a subsequent review article.
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Rhizoctonia Species: Taxonomy, Molecular Biology, Ecology, Pathology and Disease Control - Rhizoctonia species: taxonomy, molecular biology, ecology, pathology and disease control
1996Co-Authors: B Sneh, S M Neate, S. H. Jabaji-hare, Gerda DijstAbstract:Preface B. Sneh, et al. Introduction: The Genus Rhizoctonia A. Ogoshi. I: Taxonomy and Evolution of Rhizoctonia spp. I.A. Classical Methods. I.B. Biochemical and Molecular Methods. II: Genetics, and Pathogenicity of Rhizoctonia spp. III: Plant-Pathogen Interactions of Rhizoctonia spp. IV: Ecology of Rhizoctonia spp., Population and Disease Dynamics. V: Characterization of Rhizoctonia spp. Isolates, Disease Occurrence and Management in Various Crops. VI: Control of Disease Caused by Rhizoctonia Species. VI.A. Cultural Control. VI.B. Biological Control. VI.C. Plant Germ Plasm for Resistance Against Rhizoctonia. VI.D. Chemical Disease Control of Rhizoctonia Species. VI.E. Integrated Control of Rhizoctonia Species. Index.
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Rhizoctonia species taxonomy molecular biology ecology pathology and disease control
1996Co-Authors: B Sneh, S H Jabajihare, S M Neate, Gerda DijstAbstract:Preface B. Sneh, et al. Introduction: The Genus Rhizoctonia A. Ogoshi. I: Taxonomy and Evolution of Rhizoctonia spp. I.A. Classical Methods. I.B. Biochemical and Molecular Methods. II: Genetics, and Pathogenicity of Rhizoctonia spp. III: Plant-Pathogen Interactions of Rhizoctonia spp. IV: Ecology of Rhizoctonia spp., Population and Disease Dynamics. V: Characterization of Rhizoctonia spp. Isolates, Disease Occurrence and Management in Various Crops. VI: Control of Disease Caused by Rhizoctonia Species. VI.A. Cultural Control. VI.B. Biological Control. VI.C. Plant Germ Plasm for Resistance Against Rhizoctonia. VI.D. Chemical Disease Control of Rhizoctonia Species. VI.E. Integrated Control of Rhizoctonia Species. Index.
