Characterization of AG-13, a Newly Reported Anastomosis Group of Rhizoctonia solani

Phytopathology - Tập 92 Số 8 - Trang 893-899 - 2002
D. E. Carling1,2,3,4, Richard E. Baird1,2,3,4, Ronald D. Gitaitis1,2,3,4, K. A. Brainard1,2,3,4, Shiro KUNINAGA1,2,3,4
1Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido 061-0293, Japan
2Mississippi State University, P.O. Box 9655, Mississippi State 39762;
3University of Alaska Fairbanks, 533 E. Fireweed, Palmer 99645;
4University of Georgia, Coastal Plains Experiment Station, Tifton 31793;

Tóm tắt

Rhizoctonia solani anastomosis group (AG)-13 was collected from diseased roots of field grown cotton plants in Georgia in the United States. Isolates of AG-13 did not anastomose with tester isolates of AG-1 through AG-12. Mycelium of all isolates of AG-13 were light brown but darkened as cultures aged. All isolates produced aerial mycelium. Concentric rings were visible after 3 to 4 days of growth but disappeared as cultures aged and darkened. Individual sclerotia were up to 1.5 mm in diameter, similar in color to the mycelium, and generally embedded in the agar. Clumps of sclerotia up to 5 mm in diameter were produced on the agar surface. All attempts to induce basidiospore production were unsuccessful. The 5.8S region of the rDNA from isolates of AG-13 was identical in length and sequence to isolates of all other AGs of R. solani. Length and sequence of the internal transcribed spacer (ITS) regions of rDNA from isolates of AG-13 were unique among AGs of R. solani. Similarity between AG-13 and other AGs of R. solani ranged from 68 to 85% for ITS region 1 and 85 to 95% for ITS region 2. Selected isolates of AG-13 caused minor or no damage to barley, cauliflower, cotton, lettuce, potato, and radish in laboratory or greenhouse studies.

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Phytopathology

Tập 92 Số 8

893-899

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