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The accumulation of arsenic (As), a toxic carcinogenic element, in rice plants is a matter of significant environmental and human health concern. This study was performed to analyze the impact of As on ionome profile of rice (Oryza sativa L.) plants. The rice seedlings were subjected either to fixed concentration of 20 μM arsenite [As(III)] for different durations (1, 3, 7, 15 and 30 d) or to different concentrations of As(III) (0, 3, 5, 10, 20, and 50 μM) for fixed duration of 15 d. In both concentration- and duration-dependent experiments, As concentration in leaves and roots was found to increase progressively. The maximum As level was observed at 50 μM in concentration dependent experiment (185 μg g-1 dw in leaves and 9027 μg g-1 dw in roots) and at 30 d in duration dependent experiment (78 μg g-1 dw in leaves and 6175 μg g-1 dw in roots). In concentration dependent experiment, Ni showed a progressive increase while Cu (at all concentrations) and Mn (beyond 5 μM) a decline in both leaves and roots. Zn and Co showed an increase in leaves while a decline in roots. A similar trend of different element concentration was recorded in duration dependent experiment. The present analyses thus highlight that As exposure has profound influence on elemental composition of rice seedlings. Therefore, the health and safety aspects of As impacted rice plants must also be assessed from the perspective of other elemental concentrations.

Analysis of Arsenic Accumulation and its Effects on the Ionome Profile of Rice (Oryza sativa L.) Plants