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Interaction of iron and zinc nanoparticles in the rice rhizosphere at elevated CO2

KrishiKosh

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Title Interaction of iron and zinc nanoparticles in the rice rhizosphere at elevated CO2
M.Sc.
 
Creator RAMESH CHANDRA YADAV
 
Contributor A. K. Patra
 
Subject dna, inorganic compounds, vegetables, planting, rice, biological development, vegetative propagation, reproductive stage, developmental stages, plant extracts
 
Description Development of nanotechnology is getting more and more attention for use in
industry, agriculture and environment. In agriculture, nanomaterials are promising as
a source of slow release nutrients. In hydroponics under controlled phytotron facility
an experiment was conducted to assess the effect of different concentration of
nanoparticles, and levels of atmospheric CO2 concentration on the growth of rice
plant including root related parameters and exudation behaviour of organic acids.
Nanoparticles were added to the hydroponic solution to reach the concentration
at100, 500 and 1000 ppm for metal oxide nanoparticles (ZnO and Fe2O3). Results
showed that the release of organic acids as well as root growth was affected
dramatically by nanoparticles at elevated CO2 condition. The highest amount of
detected organic acid was oxalic acid (30.17 μmol plant–1day-1), while the lowest
was citric acid (1.26 μmol plant–1day-1) in the root exudates. The secretion of
organic acid was observed highest at 100 ppm of Fe nanoparticles, while it was
lowest at 1000 ppm of organic acids. It has been noticed that organic acid release
was significantly decreased with the increase in concentration of nanoparticles at
elevated CO2. At elevated atmospheric CO2 concentration all the root related
parameters significantly increased [viz. root volume (15 %) and root surface area
(17.5%)]. The interaction effect among treatment and elevated CO2 on in all root
parameter except root length was significant. The Transmission Electron
Microscopy (TEM) clearly demonstrated that the rice plant can directly absorb the
n-Fe2O3 and n-ZnO particles from solution culture and deposit in the cellular tissues
of roots causing growth inhibition. The accumulation of the Fe2O3 and ZnO
nanoparticles into the rice root system was greater when the Fe and Zn nano
particles were applied in higher doses (500 ppm and 1000 ppm).The toxicity of
nanoparticles was also observed when the nanoparticles were applied beyond 500
ppm. It could be concluded that the nano Fe and Zn should be applied in right
quantity in order to harness their nutritional benefit else might become toxic to rice
plant.
 
Date 2016-03-14T17:30:15Z
2016-03-14T17:30:15Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/65132
 
Language en_US
 
Format application/pdf
 
Publisher IARI, Division of Soil Science and Agricultural Chemistry, New Delhi