Research in Plant Disease 2013;19(4):308-312.
Published online December 30, 2013.
Identification of Ciboria carunculoides RS103V, a Fungus Causing Popcorn Disease on Mulberry Fruits in Korea
Razia Sultana1, Ho-Jong Ju2, Jong-Chan Chae1, Kangmin Kim1** and Kui-Jae Lee1*
1Division of Biotechnology, Chonbuk National University, Iksan 570-752, Korea
2Department of Agricultural Biology, College of Agriculture & Life Sciences, Chonbuk National University, Jeonju 561-756, Korea
Received: November 14, 2013   Revised: November 19, 2013   Accepted: November 20, 2013
Abstract
The popcorn disease caused by sclerotia forming fungi reduces the productivity of mulberry fruits in world wide. In Korea, only two species (Ciboria shiraiana and Scleromitrula shiraiana) have been reported as the major causal organisms and their morphological features are also largely unknown. Hereby, we report the first identification of another species (i.e. Ciboria carunculoides) in Korea and detailed features of their anamorphic stage. Fungi dominantly associated with sclerotia were purely isolated from infected mulberry fruits under the microscope. PCR-amplified DNA encoding 5.8S rRNA displayed 100% similarity to Ciboria carunculoides. The anamorphic features exhibited the absence of true mycelia. Instead, very short, aseptated, branched conidiophores were directly emerged from sclerotia. Phialides were usually three in number from each conidiophore, ampuliform to navicular in shape, slightly curved and tapering towards the apex. Conidia were produced from phialides and mostly found as one celled, pear shaped, not hyaline with smooth to uneven surface walled. Diversely modified features in phialides formed pseudo-mycelial structures around the host tissue. Combined all, current study is the first report of C. carunculoides isolated in Korea and the foremost detailed description of its anamorph stage.
Key Words: Anamorph, Ciboria carunculoides, Mulberry, Popcorn disease, South Korea


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