Saleh, A.M., Hassan, Y.M., Habeeb, T.H., Alkhalaf, A.A., Hozzein, W.N., Selim, S. and AbdElgawad, H.
2021
Interactive effects of mercuric oxide nano=particles and future climate CO2 on maize )corn) plant.
Journal of Hazardous Materials 403: 123849, doi.org/10.1016/j.jhazmat.2020.123849.
RESULTS:
"Saleh et al. conclude their findings "suggest that HgO-NPs cause severe phytotoxic hazards and [that] this effect will be less detrimental under future CO2 climate.
HgO-NPs pollution increased the mercury (Hg) level of both maize roots and shoots regardless of CO2 concentration.
... the coexistence of elevated CO2 "significantly mitigated the phytotoxicity hazards ...
The end result of all this molecular and enzymatic interplay can be summed up in the authors' data on net photosynthesis and plant biomass.
Compared to the control treatment (ambient CO2 and no HgO-NPs) HgO-NPs reduced these two parameters by 47% and 53%, elevated CO2 increased them by 74% and 19%, and
in the combined treatment (elevated CO2 plus HgO-NPs) elevated CO2 fully ameliorated the negative effects of HgO-NPs by returning net photosynthetic and dry weight measurements to that observed under control conditions.
BACKGROUND:
The increased fabrication of materials at the nanometric scale (1-100 nm), i.e., nanotechnology, has led to nano-sized heavy metal pollution.
In this regard, nano-sized mercuric oxide (HgO-NPs) produced via the production of batteries, gas sensors, small electronic devices and other processes,
induces phytotoxicity in plants, impairing the photosynthetic process and causing oxidative damage and the overproduction of reactive oxygen species (ROS),
all of which negative effects ultimately reduce plant growth and yield.
... The two CO2 levels included 410 ppm (ambient) and 620 ppm (elevated) and HgO-NPs pollution was applied at a rate of 100 mg kg-1 soil."
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Thursday, May 6, 2021
"Mercuric Oxide Pollution is Fully Ameliorated by Elevated CO2 in Maize (Corn) Plants"
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