Mycobiology.  2019 Sep;47(3):308-318. 10.1080/12298093.2019.1628522.

Bio-Sulfur Pre-Treatment Suppresses Anthracnose on Cucumber Leaves Inoculated with Colletotrichum orbiculare

Affiliations
  • 1College of Applied Life Science, Major of Plant Resources and Environment, Jeju National University, Jeju, Korea. ycjeun@jejunu.ac.kr
  • 2Eco Energy Holdings Co., Ltd, Seoul, Korea.
  • 3Department of Horticultural Science, Gyeongnam National University of Science and Technology (GNTech), Jinju, Korea.
  • 4Sustainable Agriculture Research Institute, Jeju National University, Jeju, Korea.

Abstract

Bio-sulfur can be produced in the process of desulfurization from a landfill and collected by some microorganism such as Thiobacillus sp. as a sulfur element. In order to investigate practical use of bio-sulfur as an agent for controlling plant disease, in vitro antifungal activity of bio-sulfur was tested against Colletotrichum orbiculare known to cause cucumber anthracnose. Efficacy of bio-sulfur for suppressing anthracnose disease was also evaluated in vivo using cucumber leaves. Mycelial growth of C. orbiculare on medium containing bio-sulfur was inhibited. Disease severity of cucumber leaves pre-treated with bio-sulfur was significantly decreased compared to that of untreated ones. To illustrate how bio-sulfur could suppress anthracnose disease, structures of cucumber leaves infected with C. orbiculare were observed under a fluorescent microscope and a scanning electron microscope (SEM). Cucumber leaves pre-treated with bio-sulfur showed a low rate of appressorium formation whereas untreated ones showed abundant appressoria. Shrunk fungal hyphae were mostly observed on bio-sulfur-pretreated leaves by SEM. Similar results were observed on leaves pre-treated with a commercial fungicide Benomyl®. These results suggest that inhibition of appressorium formation of C. orbiculare by bio-sulfur may contribute to its suppression of cucumber anthracnose.

Keyword

Environment-friendly; fluorescence microscope; infection behavior
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