Journal
ACS NANO
Volume 7, Issue 10, Pages 8972-8980Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn4034794
Keywords
AgNPs; graphene oxide; Ag@dsDNA@GO composites; dsDNA; bacteria; tomato
Categories
Funding
- Ministry of National Education, Republic of Turkey
- National Science Foundation (NSF)
- University of Florida
- National Institutes of Health [GM079359, CA133086]
- National Key Scientific Program of China [2011CB911000]
- NSFC [21221003]
- China National Instrumentation Program [2011YQ03012412]
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Bacterial spot caused by Xanthomonas perforans is a major disease of tomatoes, leading to reduction in production by 10-50%. While copper (Cu)-based bactericides have been used for disease management, most of the X. perforans strains isolated from tomatoes in Florida and other locations worldwide are Cu-resistant. We have developed DNA-directed silver (Ag) nanoparticles (NPs) grown on graphene oxide (GO). These Ag@dsDNA@G0 composites effectively decrease X. perforans cell viability in culture and on plants. At the very low concentration of 16 ppm of Ag@dsDNA@G0, composites show excellent antibacterial capability in culture with significant advantages in improved stability, enhanced antibacterial activity, and stronger adsorption properties. Application of Ag@dsDNA@G0 at 100 ppm on tomato transplants in a greenhouse experiment significantly reduced the severity of bacterial spot disease compared to untreated plants, giving results similar to those of the current grower standard treatment, with no phytotoxicity.
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