Arsenic Toxicity in Akitakomachi Rice in Presence of Fe3+-Edta

Abstract

An experiment was carried out hydroponically to investigate the arsenic (As) toxicity in rice (Oryza sativa L. cv. Akitakomachi) seedlings in presence of Fe 3+ -EDTA. The As treatments (NaAsO 2 ) were 0, 6.7, 13.4, 26.8, and 33.5 µM for 14 days. The whitish chlorotic symptom was pronounced in the fully expanded young leaves at 13.4 µM As treatment, suggesting that As-induced chlorosis might be Fe (iron)-chlorosis. Chlorophyll indices and Fe concentrations were reduced much in the shoots of As-treated chlorotic seedlings as compared to the control seedlings. Our result showed that Astoxicity largely depended on the concentrations of inorganic As in the medium and the higher was the concentration of As the higher was the As-toxicity.

Synchrotron based study of As mobility and speciation in tailings from a mining site in Mexico

“…These values are useful for measuring the fraction of As that is potentially available for plant uptake and consequently useful for determining their potential toxicity. Arsenic has been shown toxic to the plants in a range between 40 and 200 mg•kg -1 in sandy and clay soils, and between 0.5 and 1 mg•L -1 in hydroponic experiments [38,39]. Some plant species growing around mine tailings, shrubs in majority, were analyzed for As; however, no elevated As concentrations were found in their tissues, with exception of the species Fouquieria splendens, Cineraria marítima and Baccharis salcifolia, which exhibited the highest As concentration in root and stem tissues (44 ± 6 and 30 ± 4 mg•kg -1 , respectively).…”