Growth inhibition of rice (Oryza saliva L.) seedlings in Ga- and In-contaminated acidic soils is respectively caused by Al and Al plus In toxicity
Journal
Journal of Hazardous Materials
Journal Volume
344
Start Page
274
End Page
282
Date Issued
2018-02
Date
2018-02
Author(s)
Abstract
Limited information exists on the effects of emerging contaminants gallium (Ga) and indium (In) on rice plant growth. This study investigated the effects on growth and uptake of Ga and In by rice plants grown in soils with different properties. Pot experiment was conducted and the rice seedlings were grown in two soils of different pH (Pc and Cf) spiked with various Ga and In concentrations. The results showed concentrations of Ga, In, and Al in soil pore water increased with Ga- or In-spiking in acidic Pc soils, significantly decreasing growth indices. According to the dose-response curve, we observed that the EC50 value for Ga and In treatments were 271 and 390 mg kg−1 in Pc soils, respectively. The context of previous hydroponic studies suggests that growth inhibition of rice seedlings in Ga-spiked Pc soils is mainly due to Al toxicity resulting from enhanced Al release through competitive adsorption of Ga, rather than from Ga toxicity. In-spiked Pc soils, both In and Al toxicity resulted in growth inhibition, while no such effect was found in Cf soils due to the low availability of Ga, In and Al under neutral pH conditions.
Subjects
Emerging contaminants
Gallium
Indium
Aluminum
Rice seedlings
SDGs
Publisher
Elsevier
Type
journal article