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http://dx.doi.org/10.5423/RPD.2011.17.3.405

Rhizoctonia Blight of Azolla japonica Caused by Rhizoctonia solani  

Lee, Jung-Han (Department of Chemistry and Research Institute of Life Science, Gyeongsang National University)
Cha, Jea-Yul (Department of Applied Biology, College of Agriculture and Life Science, Gyeongsang National University)
Noh, Gil-Han (Department of Applied Biology, College of Agriculture and Life Science, Gyeongsang National University)
Han, Ki-Soo (Department of Applied Biology, College of Agriculture and Life Science, Gyeongsang National University)
Bae, Dong-Won (Central Instrument Facility, Gyeongsang National University)
Kwon, Young-Sang (Division of Applied Life Science (BK21 Program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University)
Lim, Chae-Shin (Gyeongsangnam-do Agricultural Research and Extension Service)
Jeong, Sung-Woo (Department of Horticulture, Gyeongsang National University)
Kwon, Jin-Hyeuk (Gyeongsangnam-do Agricultural Research and Extension Service)
Park, Chung-Gyoo (Department of Applied Biology, College of Agriculture and Life Science, Gyeongsang National University)
Kwak, Youn-Sig (Department of Applied Biology, College of Agriculture and Life Science, Gyeongsang National University)
Publication Information
Research in Plant Disease / v.17, no.3, 2011 , pp. 405-409 More about this Journal
Abstract
Azolla Lam. is a small aquatic fern with deeply bilobed leaves, which are consisted of a thick greenish, with chlorophyll, upper (dorsal) lobe and a thinner, translucent lower (ventral) lobe, without chlorophyll, submerged in the water. Azolla blight was observed at a lotus pond. Mycological characteristics of the fungus associated with Azolla blight was immediately determined as Rhizoctonia sp. by the thickness and branching of hypha at right angles at the point toward the distal end of septa, with branching hypha is constricted. The fungus produced brown mycelia and dark brown sclerotia on PDA. The optimum temperature for mycelial growth and sclerotia formation were $25^{\circ}C$ and $30^{\circ}C$, respectively. The optimum temperature for fungal infection was $30^{\circ}C$, when spray inoculated. Phylogenetic analysis of rDNA-ITS revealed that the fungus was identified as Rhizoctonia solani (AG-1 IA) closest to one causing rice sheath blight disease. This is the first report on the blight disease of Azolla caused by R. solani in Korea.
Keywords
Azolla japonica; Green manure plants; Rhizoctonia solani;
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