Sensitivity of Pectobacterium carotovorum to hydroxytyrosol-rich extracts and their effect on the development of soft rot in potato tubers during storage |
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| Institution: | 1. Julius Kühn-Institut (JKI), Federal Research Centre for Cultivated Plants, Institute for National and International Plant Health, Messeweg 11/12, 38104 Braunschweig, Germany;2. Georg-August-University Göttingen, Department of Crop Sciences, Section Agricultural Entomology, Grisebachstrasse 6, 37077 Göttingen, Germany;1. Department of Agricultural Chemistry, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea;2. Department of Microbiology, School of Life Sciences, VELS University, Chennai 600117, India;3. Department of Microbiology, Indira Gandhi College of Arts and Science, Kathirkamam, Pondicherry 605009, India;1. Department of Plant Pathology, Faculty of Agriculture, Assiut University, Assiut 71526, Egypt;2. Department of Botany and Microbiology, Faculty of Science, Assiut University, Assiut 71516, Egypt;1. Microbial Safety Division, National Academy of Agricultural Science, Rural Development Administration, Suwon 441-707, Republic of Korea;2. Business Planning Dept, CHUNLAB INC, Gwanak-gu, Seoul 151-742, Republic of Korea;1. Department of Bacterial Plant Pathology, Plant Pathology Research Institute, Agriculture Research Centre, Giza, 12619, Egypt;2. Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo, 11562, Egypt |
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| Abstract: | A hydroxytyrosol-rich olive mill wastewater (HROMW) (29.3% weight:dry weight) and a hydroxytyrosol-rich extract (HRE) (52.7% weight:dry weight) were prepared from the fresh olive mill wastewater (OMW) using hydrolysis and post-hydrolysis purification processes. The minimal bactericidal concentrations of HROMW and HRE against Pectobacterium carotovorum subsp. carotovorum were 72 and 40 g L?1, respectively. According to the European standard method (EN 1276: 1997), HROMW and HRE showed powerful disinfectant properties and reduced the viability of P. carotovorum by more than 5 log units after a contact time of 5 min at 2% dry weight:volume. Curative and preventive controls of potato soft rot were obtained by treatment of tubers with HROMW or HRE 3 days before or 3 days after their infection with P. carotovorum, respectively. The soft rot development during potato tuber storage was significantly reduced by treatment with HRE. This extract could be used in eco-friendly strategies of post-harvest disease control and could substitute for chemical pesticides. |
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| Keywords: | Potato Soft rot Post harvest treatment Hydroxytyrosol Olive mill wastewater |
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