NGHIÊN CỨU KHẢ NĂNG ỨC CHẾ NẤM GÂY BỆNH TRÊN CÂY THANH LONG CỦA VẬT LIỆU HỖN HỢP NANO BẠC/ĐỒNG

Tóm tắt

In the present study, silver and copper nanoparticles were synthesized by chemical microwave polyol
method, where AgNO3 and CuC2O4 were taken as metal precursors, glycerol as a reducing agent.
TEM image of the obtained product showed the average particle size of 50 to 60 nm. Antifungal activity
of the synthesized Ag/Cu nanomaterial was studied against the crop pathogenic fungi Colletotrichum sp
and Neoscytalidium dimidiatum isolated from infected dragon plant in Long An province by Institute of
Biotechnology, VAST. Assessment of fungicidal activity of the Ag/Cu nanomaterial showed that this
product exhibited strong antifungal activity towards dragon pathogenic fungi. At highest nanosilver
concentration of the Ag/Cu nanoparticles (40/24 ppm) sclerotial germination of Colletotrichum sp was
almost inhibited (after 7 days of inoculation the inhibition effect on sclerotial germination attained
100%). For the case of Neoscytalidium dimidiatum, after 3 days at 40/24 ppm Ag/Cu NPs
concentration the inhibition effect on sclerotial germination attained 93.3%. Comparing antifungal
activity of total nano Ag/Cu’s concentration with specific activities of silver and copper NPs separately
which have the same concentration showed that the antifungal activity of Ag/Cu nanoparticles was
noticeably higher, confirming the synergic effect of these metals. The obtained results suggested that
the synthesized Ag/Cu nanomaterial acts as an effective antifungal agent. Thus, it could be used in
developing novel antifungal agents for potential applications in agriculture.
Keywords: dragon, antifungal activity, Colletotrichum sp, Neoscytalidium dimidiatum.