Rhizopus Soft Rot on Lily Caused by Rhizopus oryzae in Korea

Research in Plant Disease 2014;20(1):50-53.
Published online December 15, 2014.

Rhizopus oryzae에 의한 백합 무름병

함수상¹* · 홍계완² · 김병련¹ · 한광섭¹ · 최택용² · 남윤규¹ · 유승헌³

¹충남농업기술원 농업환경연구과, ²충남농업기술원 태안백합시험장, ³충남대학교 농업생명과학대학 응용생물학과

Rhizopus Soft Rot on Lily Caused by Rhizopus oryzae in Korea

Soo-Sang Hahm1*, Gye-Wan Hong2, Byung-Ryun Kim1, Kwangseop Han1, Takyong Choi2, Yungyu Nam1 and Seunghun Yu3

¹Agricultural Environment Research Division, Chungnam Agricultural Research and Extension Services, Yesan, Chungnam 340-861, Korea
²Taean Lily Expt. Station, Chungnam Agricultural Research and Extension Services, Taean 357-952, Korea
³Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon 305-764, Korea

Correspondence: Soo-Sang HahmTel : +82,

Soo-Sang Hahm

Tel : +82-41-635-6112
Fax: +82-41-635-7923
E-mail: hahmsoo@korea.kr

Received: February 03, 2014 Revised: March 18, 2014 Accepted: March 19, 2014

Abstract

Rhizopus soft rot of lily (Lilium longiflorum) caused by Rhizopus oryzae was observed in the experimental field in Taean Lily Experiment Station in Korea, 2012. The typical symptoms were water-soaked lesions on bottom stem and leaf rot. The lesion rapidly expanded and the plant was softened totally. The fungus grew vigorously at an optimum temperature (25°C) and brownish colony and black sporangia were formed on potato dextrose agar medium. Sporangiophores formed on end of sporangia were sub-globose, brownish and 6-10 μm in size. Sporangia were globose, blackish and 87-116 μm in size. Sporangiospores were irregularly oval and sub-globose, brownish 4-8 μm in size. On the basis of mycological characteristics, analyzing sequences of internal transcribed spacer region of ribosomal DNA, and pathogenicity test on host plants, the causal fungus was identified as R. oryzae. This is the first report of Rhizopus soft rot on lily caused by R. oryzae in Korea.

Key Words: Lily, Lilium longiflorum, Rhizopus soft rot, Rhizopus oryzae