Activity assessment of potato soft rot pathogen Pectobacterium carotovorum subsp. carotovorum under certain metallic salts effect

Document Type : Research Article

Authors

1 Botany Dept., Faculty of Science, Mansoura Univ., Dakahlyia, Egypt

2 Plant Pathology Dept., Faculty of Agriculture and Natural Resources, Aswan Univ., Aswan, Egypt

3 Plant Pathology Dept., Faculty of Agriculture, Assiut Univ., Assiut, Egypt

10.21608/mjb.2020.460330

Abstract

Ten isolates of Pectobacterium carotovorum subsp. carotovorum were isolated from naturally soft rot tubers of potato plants collected from Assiut and Sohag governorates, Egypt. All the tested isolates infect potato tubers with different degrees of disease severity, isolate No. 3 showed the highest disease severity followed by isolate No. 5 and the lowest one was isolate No. 2. The growth assessment of soft rot pathogen of potato tubers was carried out in the presence of metallic salts “silver nitrate (AgNO3), chromium III sulfate hydrate (Cr2(SO4)3.12H2O) and zinc sulfate heptahydrate (ZnSO4.7H2O)ˮ under laboratory conditions. The three selected salts revealed inhibiting activity against the pathogen using disc diffusion Kirbey-Bauer method. A clear zones at minimum inhibitory concentration made by silver nitrate, chromium III sulfate hydrate and zinc sulfate heptahydrate were 9.45mm / 150 µg/ml, 9.28mm / 200 µg/ml and 7.18mm / 400 µg/ml respectively, which indicate the bacterial growth reduction with percentage 21.2%, 20.8 % and 16.1 %, respectively. Further study needs to explain the soft rot disease progress made by P. carotovorum subsp. carotovorum in the presence of the three salts effect under storage conditions.

Keywords

Mansoura Journal of Biology
Volume 49, Issue 4
December 2020
Pages 1-8

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