Interactive effects of arsenic and phosphorus on their uptake by wheat varieties with different arsenic and phosphorus soil treatments

摘要

In this research we have investigated relationship between arsenate and phosphate uptake and its distribution inroot, shoot, and seed of wheat varieties. Three wheat varieties were selected and grown in 7 Kg pots undercontrolled conditions among which, Sardari variety were collected from Iranian arsenic contaminated area andtested along with two other varieties Parsi and Pishtaz. The aim was to select a variety with low arsenateuptake ability with the aim of improving food safety and human health. Arsenic was applied with followingconcentrations of 0, 5, 25, 125 and 625 mg l?1in the presence or absence of P. With increasing Asconcentration in irrigation water, As levels of roots, shoots and seeds increased. Also, measurements indicatedthat As uptake rates decreased in the presence of P. Also, at 125 and 625 mg l?1 As concentration levels, themeasured As concentrations of seed and shoot exceeded the tolerance limit, regardless of P presence. Amongwheat varieties, Sardari (of contaminated area) had significantly less uptake of As compared with two othervarieties. Besides, P concentrations in all wheat varieties followed the following order: seed > root > shoot.