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Enhancing the Mobilization of Native Phosphorus in the Mung Bean Rhizosphere Using ZnO Nanoparticles Synthesized by Soil Fungi
journal contribution
posted on 2016-04-07, 00:00 authored by Ramesh Raliya, Jagadish
Chandra Tarafdar, Pratim BiswasPhosphorus
(P) is a limiting factor to plant growth and productivity
in almost half of the world’s arable soil, and its uptake in
plants is often constrained because of its low solubility in the soil.
To avoid repeated and large quantity application of rock phosphate
as a P fertilizer and enhance the availability of native P acquisition
by the plant root surface, in this study a biosynthesized ZnO nanoparticle
was used. Zn acts as a cofactor for P-solubilizing enzymes such as
phosphatase and phytase, and nano ZnO increased their activity between
84 and 108%. The level of resultant P uptake in mung bean increased
by 10.8%. In addition, biosynthesized ZnO also improves plant phenology
such as stem height, root volume, and biochemical indicators such
as leaf protein and chlorophyll contents. In the rhizosphere, increased
chlorophyll content and root volume attract microbial populations
that maintain soil biological health. ICP-MS results showed ZnO nanoparticles
were distributed in all plant parts, including seeds. However, the
concentration of Zn was within the limit of the dietary recommendation.
To the best of our knowledge, this is the first holistic study focusing
on native P mobilization using ZnO nanoparticles in the life cycle
of mung bean plants.