Journal
JOURNAL OF PHYTOPATHOLOGY
Volume 170, Issue 7-8, Pages 557-573Publisher
WILEY
DOI: 10.1111/jph.13105
Keywords
1; 3; 4-oxadiazole; 1; 3; 4-Thiadiazole; antioxidants enzymes; dihydrotetrazine; PepMV; tomato
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Funding
- Ministere de l'Enseignement Superieur et de la Recherche Scientifique
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This study aimed to develop chemical control methods against Pepino mosaic virus (PepMV) by using different compounds. Spray application of certain compounds can reduce the symptoms caused by the virus on tomato leaves and enhance the activity of antioxidant enzymes, thereby increasing the plant's protection ability.
Pepino mosaic virus (PepMV) is a highly infectious potexvirus, which has presently become a major pathogen for tomato crops worldwide. Since there is no effective method control for PepMV, strict preventive hygienic measures and cross-protection have been established. However, the use of mild isolates to protect against aggressive isolates provides opportunities for interaction with other microorganisms, which under certain conditions may worsen disease symptoms. Thus, alternative control methods are needed. In this study we aimed at the development of chemical control against PepMV based on the use of heterocyclic compounds including symmetrical 2,5-disubstituted 1,3,4-oxadiazoles, symmetrical 2,5-disubstituted 1,3,4-thiadiazole and dihydrotetrazine derivatives. Results showed that spray application of three 1,3,4-oxadiazole derivatives (OH-Oxa, CH3-Oxa, NO2-Oxa) and of the derivative of 1,3,4-thiadiazole (OH-Thia) resulted in reducing the main symptoms of PepMV in tomato leaves, conversely to the dihydrotetrazine carboxylic acid. Double-antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA) revealed that PepMV was not detected from tomato plants pre-treated with the derivatives conferring elevated protection. Moreover, the protective ability of OH-Oxa, CH3-Oxa, NO2-Oxa and OH-Thia was closely related to the enhancement of the activity of antioxidant enzymes upon infection with PepMV.
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