Quantification of Rice Sheath Blight Progression Caused by Rhizoctonia solani

Mukhamad Su’udi; Jong-Mi Park; Woo-Ri Kang; Duk-Ju Hwang; Soonok Kim; Il-Pyung Ahn

doi:10.1007/s12275-013-3274-7

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Research Support, Non-U.S. Gov't
Quantification of Rice Sheath Blight Progression Caused by Rhizoctonia solani: Mukhamad Su’udi ¹, Jong-Mi Park ¹, Woo-Ri Kang ¹, Duk-Ju Hwang ¹, Soonok Kim ², Il-Pyung Ahn ¹; Journal of Microbiology 2013;51(3):380-388.
DOI: https://doi.org/10.1007/s12275-013-3274-7
Published online: June 28, 2013

¹National Academy of Agricultural Science, Rural Development Administration, Suwon 441-707, Republic of Korea, ²Wildlife Genetic Resources Center, National Institute of Biological Resources, Incheon 404-708, Republic of Korea

Corresponding author: Il-Pyung Ahn , Tel: 380-388,

Received: 13 May 2013 • Accepted: 11 June 2013

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Abstract

Rhizoctonia solani has a wide host range, including almost all cultivated crops and its subgroup anastomosis group (AG)-1 IA causes sheath blight in rice. An accurate measurement of pathogen’s biomass is a convincing tool for enumeration of this disease. Mycological characteristics and molecular diagnosis simultaneously supported that all six strains in this study were R. solani AG-1 IA. Heterokaryons between strains Rs40104, Rs40105, and Rs45811 were stable and viable, whereas Rs40103 and Rs40106 did not form viable fused cells, except for the combination of Rs40106 and Rs40104. A primer pair was highly specific to RsAROM gene of R. solani strains and the amplified fragment exists as double copies within fungal genome. The relationship between crossing point (CP) values and the amount of fungal DNA was reliable (R2>0.99). Based on these results, we determined R. solani’s proliferation within infected stems through real time PCR using a primer pair and a Taqman probe specific to the RsAROM gene. The amount of fungal DNA within the 250 ng of tissue DNA from rice cv. Dongjin infected with Rs40104, Rs40105, and Rs45811 were 7.436, 5.830, and 5.085 ng, respectively. In contrast, the fungal DNAs within the stems inoculated with Rs40103 and Rs40106 were 0.091 and 0.842 ng. The sheath blight symptom progression approximately coincided with the amount of fungal DNA within the symptoms. In summary, our quantitative evaluation method provided reliable and objective results reflecting the amount of fungal biomass within the infected tissues and would be useful for evaluation of resistance germplasm or fungicides and estimation of inoculum potential.

Keywords: rice sheath blight;Taqman real-time PCR

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Quantification of Rice Sheath Blight Progression Caused by Rhizoctonia solani

J. Microbiol. 2013;51(3):380-388. Published online June 28, 2013

DOI: https://doi.org/10.1007/s12275-013-3274-7

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