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Phytotoxicity of Silver Nanoparticles to Peanut (Arachis hypogaea L.): Physiological Responses and Food Safety
journal contribution
posted on 2017-06-26, 00:00 authored by Mengmeng Rui, Chuanxin Ma, Xinlian Tang, Jie Yang, Fuping Jiang, Yue Pan, Zhiqian Xiang, Yi Hao, Yukui Rui, Weidong Cao, Baoshan XingIn the present study,
we investigated the effects of silver nanoparticles
(Ag NPs) on peanut (Arachis hypogaea L.) at physiological
and biochemical levels as well as the impacts on peanut yield and
quality. Peanuts were cultivated in sandy soil amended with different
doses of Ag NPs (50, 500, and 2000 mg·kg–1)
for 98 days. Physiological parameters including plant biomass, height,
grain weight, and yield suggested that Ag NPs could result in severe
damages in plant growth. At the biochemical level, Ag NPs did not
change the predominant isozymes of each antioxidant enzyme but significantly
elevated the amounts of antioxidant isozymes as compared to those
of the control, and the antioxidant enzyme activities were consistent
with the elevation of isozymes. Ag concentrations exhibited a dose–response
fashion in peanut tissues with increasing exposure doses of Ag NPs.
The evidence of Ag NPs in the edible portion of peanuts was confirmed
by transmission electron microscopy (TEM) with energy-dispersive X-ray
spectroscopy (EDS). Additionally, alteration of the contents of fatty
acids in peanut grains upon exposure to different doses of Ag NPs
indicated that metal-based NPs could impact crop yield and quality.
Taken together, our results suggested that the concerns over how to
efficiently and safely apply nanoparticle incorporated products in
agriculture and how to control their potential impact on the food
safety and food quality should draw more attention as NPs themselves
could be taken up by crops and humans exposed to them through food
consumption.