Journal
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
Volume 143, Issue -, Pages 26-32Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.pestbp.2017.10.002
Keywords
Copper complexes; Tomato; Verticillium wilt; Crown gall, active oxygen species, antioxidant; defenses
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Funding
- CUR CA2D of Chouaib Doukkali University (El Jadida-Morocco)
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The metallic complexes mu-chloro-mu-[2,5-bis (2-pyridyl)-1,3,4-thiadiazole] aqua chlorocopper (II) dichlorocopper (II) (abbreviated 2PTH-Cu-2-Cl-4); aquabis [2,5-bis (2-pyridyl)-1,3,4-thiadiazole-kappa N-2(2),N-3] (trifluoromethane-sulfonato-kappa O) copper(II) trifluoro metrhanesulfonate (2PTH-Cu-tF) and bis[(2,5-bis(pyridine-2-yl)-1,3,4-thiadiazole-di-azido copper(II)] (2PTH-Cu-Az) were compared for their antimicrobial activities in vitro, and their aptitude to control Verticillium wilt and crown gall diseases development of tomato in the greenhouse. Results showed that the complex 2PTH-Cu-Az inhibited drastically the growth of V. dahliae in vitro. 2PTH-Cu-2-Cl-4 and 2PTH-Cu-tF did not display any noticeable antimicrobial activity in vitro against all of the pathogens tested. However, in planta evaluation revealed that the three complexes protected tomato against crown gall similarly. They also reduced Verticillium wilt disease severity, although the complex 2PTH-Cu-Az was the most efficient. When compared to other complexes, 2PTH-Cu-Az triggered only a weak oxidative burst as revealed by H2O2 measurement and the activity of ascorbate peroxidase and catalase. These results suggest that the superiority of 2PTH-Cu-Az against V. dahliae rely on its direct antifungal activity and its ability to modulate H2O2 accumulation.
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