Vol. 58 No. 1 (2019)
New or Unusual Disease Reports

Leaf rot caused by Rhizopus oryzae on pak choy (Brassica campestris ssp. chinensis) in China

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  • Samaih ARIF,
  • Muhammad Farooq MUNIS,
  • Fiza LIAQUAT,
  • Iftikhar SHAH,
  • Yidong ZHANG
Samaih ARIF
Department of Plant Sciences, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, China
Muhammad Farooq MUNIS
Department of Plant Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, 45320, Pakistan Department of Plant Pathology, University of California, Davis, 95616, United States of America
Fiza LIAQUAT
School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
Iftikhar SHAH
Department of Plant Sciences, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, China
Yidong ZHANG
Department of Plant Sciences, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, China
DOI: https://doi.org/10.14601/Phytopathol_Mediterr-23977

Published 2019-05-15

Keywords

  • ITS sequence

How to Cite

[1]
S. ARIF, M. F. MUNIS, F. LIAQUAT, I. SHAH, and Y. ZHANG, “Leaf rot caused by Rhizopus oryzae on pak choy (Brassica campestris ssp. chinensis) in China”, Phytopathol. Mediterr., vol. 58, no. 1, pp. 213–217, May 2019.
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Abstract

Pak choy (Brassica campestris ssp. chinensis L.) is the major vegetable crop cultivated in China. During December 2017, leaf rot was frequently observed on leaves of pak choy in greenhouses of Shanghai, China. Diseased leaf samples were plated onto acidified potato dextrose agar and fungal cultures were isolated and identified as Rhizopus oryzae, based on morphological features and molecular identification. Definitive identification as R. oryzae was based on the comparative molecular analysis of rRNA gene sequences. Blast analysis revealed 99% similarity with R. oryzae. Pathogenicity was determined by inoculating healthy pak choy leaves and plants with hyphal suspensions of R. oryzae. The fungus was re-isolated from developing similar lesions on the inoculated plants and identified as similar to the inoculated fungus, thus fulfilling Koch’s postulates. This is the first report of fungal leaf rot caused by R. oryzae on pak choy in China.

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