title: Phytoprotective effect of arbuscular mycorrhizal fungi species against arsenic toxicity in tropical leguminous species.
abstract: Arbuscular mycorrhizal fungi (AMF) improve the tolerance of hosting plants to arsenic (As) in contaminated soils. This work assessed the phytoprotective effect of Glomus etunicatum, Acaulospora morrowiae, Gigaspora gigantea, and Acaulospora sp. on four leguminous species (Acacia mangium, Crotalaria juncea, Enterolobium contortisiliquum, and Stizolobium aterrimum) in an As-contaminated soil from a gold mining area. AMF root colonization, biomass production, As and P accumulation, as well as arsenic translocation index (TI) from roots to shoots were measured. The AMF phytoprotective effect was assessed by the P/As ratio and the activity of plant antioxidant enzymes. The AMF colonization ranged from 24 to 28%. In general, all leguminous species had low As TI when inoculated with AMF species. Inoculation of C. juncea with Acaulospora sp. improved significantly As accumulation in roots, and decreased the activity of ascorbate peroxidase (APX) and superoxide dismutase (SOD), highlighting its phytoprotective effect and the potential use of this symbiosis for phytoremediation of As-contaminated soils. However, S. aterrimum has also shown a potential for phytoremediation irrespectively of AMF inoculation. APX was a good indicator of the phytoprotective effect against As contamination in C. juncea and A. mangium. In general P/As ratio in shoots was the best indicator of the phytoprotective effect of all AMF species in all plant species.
authors.forename: Rangel Wesley
authors.initials: RW
authors.lastname: de Melo
authors.forename: Jerusa
authors.initials: J
authors.lastname: Schneider
authors.forename: Costa Enio Tarso
authors.initials: CE
authors.lastname: de Souza
authors.forename: Soares Cláudio Roberto Fonsêca
authors.initials: SC
authors.lastname: Sousa
authors.forename: Guilherme Luiz Roberto
authors.initials: GL
authors.lastname: Guimarães
authors.forename: Moreira Fatima Maria
authors.initials: MF
authors.lastname: de Souza
mesh_terms: D000975:Antioxidants / Q000378:metabolism; D001151:Arsenic / Q000032:analysis / Q000378:metabolism / Q000633:toxicity*; D001673:Biodegradation, Environmental; D018533:Biomass; D007887:Fabaceae / Q000382:microbiology* / Q000502:physiology; D055137:Glomeromycota / Q000502:physiology*; D008906:Mining; D038821:Mycorrhizae / Q000502:physiology*; D010758:Phosphorus / Q000032:analysis / Q000378:metabolism / Q000633:toxicity; D055170:Plant Root Nodulation; D018517:Plant Roots / Q000382:microbiology / Q000502:physiology; D018520:Plant Shoots / Q000382:microbiology / Q000502:physiology; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism* / Q000633:toxicity; D013559:Symbiosis
chemical_list: D000975:Antioxidants; D012987:Soil; D012989:Soil Pollutants; D010758:Phosphorus; D001151:Arsenic