Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 64, Issue 13, Pages 2661-2667Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.6b00151
Keywords
2,5-bis(pyridin-2-yl)-1,3,4-thiadiazole; metal transition; plant defenses; protection; tomato; Verticillium
Funding
- University of Chouaib Doukkali, El Jadida, Morocco
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Verticillium wilt caused by Verticillium dahliae is a major limiting factor for tomato production. The objective of this study was to evaluate the effectiveness of ligand 2,5-bis(pyridin-2-yl)-1,3,4-thiadiazole (L) and its complex bis[mu-2,5-bis(pyridin-2-yl)-1,3,4-thiadiazole-kappa N-4(2),N-3:N-4,N-5]bis[dihydrato-kappa O)nickel(II)] as activators of plant defenses in controlling Verticillium wilt. In the greenhouse, they protected tomato plants against V. dahliae when they were applied twice as foliar sprays at 100 mu g mL(-1). A synergistic effect was observed between the ligand L and the transition metal Ni, with disease incidence reduced by 38% with L and 57% with Ni2L2. Verticillium wilt foliar symptoms and vascular browning index were reduced by 82% for L and 95% for Ni2L2. This protection ability was associated with the induction of an oxidative burst and the activation of the total phenolic content as well as potentiation of the activity of peroxidase and polyphenol oxidase. These results demonstrated that L and Ni2L2 can be considered as new activators of plant defense responses.
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