search for




 

Pink Mold Rot on Unishiu Orange (Citrus unshiu Mac.) Caused by Trichothecium roseum (Pers.) Link ex Gray in Korea
Res. Plant Dis. 2013;19:226-228
Published online September 30, 2013
© 2013 The Korean Society of Plant Pathology.

Jin-Hyeuk Kwon1*, Dong-Wan Kang1, Okhee Choi2 and Hong-Sik Shim3

1Gyeongsangnam-do Agricultural Research and Extention Services, Jinju 660-370, Korea
2Institute of Agriculture and Life Sciences, Gyeongsang National University, Jinju 660-701, Korea
3Crop Protection Division, National Academy of Agricultural Science, Rural Development Administration, Suwon 441-707, Korea
Phone) +82-55-771-6423, Fax) +82-55-771-6419 Email) kwon825@korea.kr
Received March 4, 2013; Revised September 17, 2013; Accepted September 23, 2013.
cc This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
2012년 경상남도 진주시 농산물도매시장에 판매중인 감귤에서 분홍빛열매썩음병이 발생하였다. 병징은 감귤 과실 표면이 수침상으로 물러지고 썩으면서 그 위에 분홍빛 곰팡이가 많이 형성되었다. 균총의 색깔은 처음에 흰색이고 배양기간이 경과됨에 따라 배지 표면에 분홍빛의 분생포자가 많이 형성되었다. 균사생육 적온은 25oC이었다. 분생포자의 모양은 서양배형이며 좌우 zigzag로 부착하며 성숙한 분생포자는 2세포로 되어 있으며 크기는 12?26 × 8?12 μm이었다. 분생자경은 균사표면에 직립으로 형성하고, 폭이 4-5 μm이고 무색이었다. rDNA의 complete internal transcribed spacer(ITS) 영역의 염기서열을 분석하였고, 분석된 염기서열(613 bp)을 BLASTN 프로그램으로 확인한 결과, Trichothecium roseum와 99%의 상동성을 나타내었다. 이와 같이 감귤에서 발생한 병징과 병원균의 균학적 특징을 기초로 하여 이 병을 Trichothecium roseum (Pers.) Link ex Gray에 의한 감귤 분홍빛열매썩음병으로 명명하고자 제안한다.
In 2012, a pink mold rot was observed on unishiu orange (Citrus unshiu Mac.) fruits at the Wholesale Market for Agricultural Products, Jinju, Korea. The symptom on unishiu orange was a water-soaked lesion on the surface of fruit, which later on enlarged to form softened brown rot lesions. The diseased fruits were covered with pink-colored mold, consisting of conidia and conidiophores of the pathogen. Optimum temperature for mycelial growth was 25oC. Conidia were hyaline, smooth, 2-celled, and thick-walled conidia with truncate bases, ellipsoidal to pyriform, characteristically held together zig-zag chains and 12?26 × 8?12 μm in size. Conidiophore was erect, colorless, unbranched, and 4?5 μm wide. On the basis of mycological characteristics, pathogenicity test, and molecular analysis with complete ITS rDNA region, the causal fungus was identified as Trichothecium roseum (Pers.) Link ex Gray. This is the first report of pink mold rot caused by T. roseum on unishiu orange in Korea.
Keywords : Citrus unshiu, Pink mold rot, Trichothecium roseum, Unishiu orange


December 2019, 25 (4)