Particle-specific toxicity and bioavailability of cerium oxide (CeO2) nanoparticles to Arabidopsis thaliana

A - Papers appearing in refereed journals

Yang, X., Pan, H., Wang, P. and Zhao, F-J. 2017. Particle-specific toxicity and bioavailability of cerium oxide (CeO2) nanoparticles to Arabidopsis thaliana. Journal Of Hazardous Materials. 322, pp. 292-300.

AuthorsYang, X., Pan, H., Wang, P. and Zhao, F-J.
Abstract

Root exudation of phytase could improve the ability of plants to access organic forms of soil phosphorus (P), thereby minimizing fertilizer requirements and improving P use efficiency in agroecosystems. After 75 days growth in a high available P soil, shoot biomass and P accumulation, soil pH, and rhizosphere P depletion were investigated in Nicotiana tabacum wild-type and transgenic plant-lines expressing and exuding Aspergillus niger phytase (ex::phyA), or a null-vector control. Solution 31P NMR analysis revealed a 7% to 11% increase in orthophosphate and a comparable depletion of undefined monoester P compounds (-13 to -18%) in the rhizosphere of tobacco plants relative to the unplanted soil control. Wild-type plants had the greatest impact on the composition of rhizosphere P based on the depletion of other monoester P, polyphosphate, and phosphonate species. The depletion of phytase-labile P by ex::phyA plants was associated with decreased proportions of other monoester P, rather than myo-InsP6 as expected. Rhizosphere pH increased from 6.0 to 6.5-6.7 in transgenic plant soils, beyond the pH optimum for A. niger phyA activity (pH=5), and may explain the limited specificity of ex::phyA plants for phytate in this soil. The efficacy of single exudation traits (e.g., phytase) therefore appear to be limited in P-replete soil conditions and may be improved where soil pH matches the functional requirements of the enzyme or trait of interest. 

Year of Publication2017
JournalJournal Of Hazardous Materials
Journal citation322, pp. 292-300
Digital Object Identifier (DOI)doi:10.1016/j.jhazmat.2016.03.054
Open accessPublished as non-open access
Funder project or codeSustainability
Output statusPublished
Publication dates
Online21 Mar 2016
Publication process dates
Accepted20 Mar 2016
PublisherElsevier
Elsevier Science Bv
Copyright licensePublisher copyright
ISSN0304-3894

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