Differential bioaccumulation and translocation patterns in three mangrove plants experimentally exposed to iron. Consequences for environmental sensing

Author(s)

Arrivabene, Hiulana Pereira ^[1] ; Campos, Caroline Quenupe ^[2] ; Souza, Iara da Costa ^[3] ; Wunderlin, Daniel Alberto ^{[4, 5]} ; Dias Milanez, Camilla Rozindo ^[2] ; Machado, Silvia Rodrigues ^[1]

Affiliation

^[1] Univ Estadual Paulista Julio de Mesquita Filho UN, Inst Biociencias Botucatu, Dept Bot, POB 510, BR-18618970 Sao Paulo - Brazil

^[2] Univ Fed Espirito Santo, Ctr Ciencias Humanas & Nat, Dept Ciencias Biol, BR-29075910 Vitoria, ES - Brazil

^[3] Univ Fed Sao Carlos, Ctr Ciencias Biol & Saude, Dept Ciencias Fisiol, BR-13565905 Sao Paulo - Brazil

^[4] Consejo Nacl Invest Cient & Tecn, ICYTAC, Ciudad Univ, RA-5000 Cordoba - Argentina

^[5] Univ Nacl Cordoba, Fac Cs Quim, Dept Qca Organ, Ciudad Univ, RA-5000 Cordoba - Argentina

• Document type: Journal article
• Source: Environmental Pollution; v. 215, p. 302-313, AUG 2016.
• Web of Science Citations: 5

Abstract

Avicennia schaueriana, Laguncularia racemosa and Rhizophora mangle were experimentally exposed to increasing levels of iron (0, 10, 20 and 100 mg L-1 added Fe(II) in Hoagland's nutritive medium). The uptake and translocation of iron from roots to stems and leaves, Fe-secretion through salt glands (Avicennia schaueriana and Laguncularia racemosa) as well as anatomical and histochemical changes in plant tissues were evaluated. The main goal of this work was to assess the diverse capacity of these plants to detect mangroves at risk in an area affected by iron pollution (Vitoria, Espirito Santo, Brazil). Results show that plants have differential patterns with respect to bioaccumulation, translocation and secretion of iron through salt glands. L. racemosa showed the best environmental sensing capacity since the bioaccumulation of iron in both Fe-plaque and roots was higher and increased as the amount of added-iron rose. Fewer changes in translocation factors throughout increasing added-iron were observed in this species. Furthermore, the amount of iron secreted through salt glands of L racemosa was strongly inhibited when exposed to added-iron. Among three studied species, A. schaueriana showed the highest levels of iron in stems and leaves. On the other hand, Rhizophora mangle presented low values of iron in these compartments. Even so, there was a significant drop in the translocation factor between aerial parts with respect to roots, since the bioaccumulation in plaque and roots of R. mangle increased as iron concentration rose. Moreover, rhizophores of R. mangle did not show changes in bioaccumulation throughout the studied concentrations. So far, we propose L. racemosa as the best species for monitoring iron pollution in affected mangroves areas. To our knowledge, this is the first detailed report on the response of these plants to increasing iron concentration under controlled conditions, complementing existing data on the behavior of the same plants under field exposure. (C) 2016 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 14/06870-0 - Iron bioaccumulation, distribution and elimination in mangrove plants: chemical and ultrastructural analysis
• Grantee: Silvia Rodrigues Machado
• Support Opportunities: Regular Research Grants