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

Autor(es)

Segura, Fabiana Roberta ; Cavalheiro Paulelli, Ana Carolina ; Leite Braga, Gilberto Ubida ; Pedreira Filho, Walter dos Reis ; Silva, Fabio Ferreira ; Batista, Bruno Lemos

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 6, n. 4, p. 7-pg., 2018-08-01.

Resumo

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 non-retained As species (NRAS), which was detected in all fungi groups. Rice grains yielding was improved by the addition of fungi, especially Aspergillus sp. These observations made us believe that the direct application of Aspergillus sp. in soils might be a good alternative for bioremediation in As-contaminated soils and As-mitigation in rice grains, improving the food safety and security for this valuable global cereal. (AU)

• Processo FAPESP: 14/05151-0 - Arsênio e arroz: monitoramento e estudos de (bio)remediação para segurança alimentar
• Beneficiário: Bruno Lemos Batista
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 15/06674-9 - Arsênio e arroz: monitoramento e estudos de (bio)remediação para segurança alimentar
• Beneficiário: Fabiana Roberta Segura
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto