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| DOI: | 10.1094/PD-90-1389 |
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| Web URL(s): | http://apsjournals.apsnet.org/doi/pdf/10.1094/PD-90-1389
Last checked: 11/28/2007
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Hayakawa, Toshihiro;
Toda, Takeshi;
Ping, Qu;
Mghalu, Joseph M.;
Yaguchi, Shigeharu;
Hyakumachi, Mitsuro |
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| Author Affiliation: | Hayakawa and Yaguchi: Research Institute of Riken Green Company, Limited, Minamideiheishinden, Fukude, Iwata, Shizuoka, Japan; Toda and Hyakumachi: Laboratory of Plant Pathology, Faculty of Applied Biological Science, Gifu University, Yanagido, Gifu, Japan; Ping and Mghalu: United Graduate School of Agricultural Science, Gifu University, Yanagido, Gifu, Japan |
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| Title: | A new subgroup of Rhizoctonia AG-D, AG-D III, obtained from Japanese zoysia grass exhibiting symptoms of a new disease |
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| Section: | Research
Other records with the "Research" Section
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| Source: | Plant Disease. Vol. 90, No. 11, November 2006, p. 1389-1394. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 6 |
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| Keywords: | TIC Keywords: Zoysia japonica; Disease identification; Spring-rot; Disease evaluation; Symptoms of pathogen infection
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| Abstract/Contents: | "Isolates of an unidentified Rhizoctonia sp. (UN isolates) were obtained from Japanese zoysia grass (Zoysia japonica Steud) that exhibited symptoms of a new sheath rot disease. UN isolates were binucleate and showed hyphal fusion with tester isolates of Rhizoctonia anastomosis group (AG)-D. Those isolates were compared with isolates of subgroups I and II of Rhizoctonia AG-D based on cultural morphology, hyphal growth rate at different temperatures, anastomosis frequency, pathogenicity, and sequence analysis of the internal transcribed spacer (ITS) region of ribosomal DNA genes (rDNA-ITS region). The mycelial color of UN isolates was light yellow which differs from AG-D I but is similar to AG-D II. Sclerotia of UN isolates were dark brown in color and larger in size (1 to 3 mm in diameter) than those of AG-D subgroup I (1 mm in diameter), whereas isolates of AG-D II produced white mycelial clamps 4 to 5 mm in size. Hyphal growth rate of UN isolates was slower than that of two AG-D subgroups at several temperatures, especially 25°C. In pathogenicity tests on Japanese zoysia grass, UN isolates showed moderate disease severity and lower pathogenicity than isolates of AG-D subgroups I and II. Sequences of the rDNA-ITS region within UN isolates were almost homologous, but had lower homology with subgroups AG-D I or II. Phylogenetic trees constructed using ITS sequences showed that UN isolates formed an individual cluster that differed from the clusters of the two subgroups. We propose that UN isolates are a new subgroup of Rhizoctonia AG-D, subgroup III, and the name of the disease is "spring-rot" on Japanese zoysia grass." |
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| Language: | English |
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| References: | 20 |
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| Note: | Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hayakawa, T., T. Toda, Q. Ping, J. M. Mghalu, S. Yaguchi, and M. Hyakumachi. 2006. A new subgroup of Rhizoctonia AG-D, AG-D III, obtained from Japanese zoysia grass exhibiting symptoms of a new disease. Plant Dis. 90(11):p. 1389-1394. |
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| DOI: 10.1094/PD-90-1389 |
| Web URL(s):
http://apsjournals.apsnet.org/doi/pdf/10.1094/PD-90-1389
Last checked: 11/28/2007
Requires: PDF Reader |
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MSU catalog number: SB 599 .P95 |
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