| Literature DB >> 28363128 |
Yifan Huang1, Weiwen Qiu2, Zhihong Yu1, Zhengguo Song3.
Abstract
Information regarding the toxic effects of cadmium (Cd) adsorbed by nano-hydroxyapatite (NHAP-Cd) on the growth of crop plants remain limited. We investigated the mechanism of NHAP-Cd (diameters, 20 and 40nm; NHAP20-Cd and NHAP40-Cd, respectively) phytotoxicity. Rice seedlings treated with Cd and NHAP20-Cd showed more severe growth retardation compared to those treated with NHAP40-Cd, for the same Cd concentration. Transmission electron microscopy revealed NHAP in the seedlings. The nanoparticles entered the rice seedlings with no Cd2+ signals in the NHAP treatments compared to -0.47pmolcm-2s-1 of Cd2+ fluxes in the Cd treatment. The higher Cd2+ content in the leaves and mesocotyl of NHAP20-Cd-treated rice seedlings suggested that smaller NHAP-Cd can translocate easily to the aboveground parts. Further, NHAP-Cd increased oxidative stress, which was determined as catalase activity changes in this study. Thus, NHAP-Cd particles in the growth medium can be transported to rice seedlings and cause toxicity.Entities:
Keywords: Hydroxyapatite-adsorbed Cd(2+); Nanoparticle; Rice seedling; Toxicity
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Year: 2017 PMID： 28363128 DOI： 10.1016/j.etap.2017.03.005
Source DB: PubMed Journal: Environ Toxicol Pharmacol ISSN： 1382-6689 Impact factor: 4.860