Promising filamentous native fungi isolated from paddy soils for arsenic mitigation in rice grains cultivated under flooded conditions

Publication date: Available online 22 May 2018 Source:Journal of Environmental Chemical Engineering Author(s): Fabiana Roberta Segura, Ana Carolina Cavalheiro Paulelli, Gilberto Úbida Leite Braga, Walter dos Reis Pedreira Filho, Fábio Ferreira Silva, Bruno Lemos Batista Rice grains are a significant source of inorganic arsenic (i-As) in population's diet. Regulations for maximum limits and mitigation are in development by the Codex/FAO. Fungi from rice’s rhizosphere are a potential tool for As-mitigation. Two fungi genera (Aspergillus sp. and Penicillium sp.) were applied in soils (background −Bkg- and spiked with 5 mg As(V) kg−1 −Spk) during rice cultivation (flooded) to test a realistic As-mitigation in grains. After complete plant maturation, soils, roots, and grains were analyzed. In Bkg and Spk soils, the synergistic group “Aspergillus sp. + Penicillium sp.” presented the lowest As-levels significantly. Considering grains grown in Bkg, total As (t-As) increased for Penicillium sp. due to the increase in organic As (o-As) and As(V). However, As(III) decreased in the grains of all groups treated with Penicillium sp., Aspergillus sp., and the synergism. For Spk, it was observed a significant reduction of t-As in grains of all fungi-groups. In general, Penicillium sp. and synergism groups presented intermediary and worst efficiency for As-mitigation, respectively. Aspergillus sp. presented the lowest levels to all As-species in Spk, except to the ...
Source: Journal of Environmental Chemical Engineering - Category: Chemistry Source Type: research