2005
DOI: 10.1016/j.ecss.2005.06.007
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Exudation of organic acids by a marsh plant and implications on trace metal availability in the rhizosphere of estuarine sediments

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Cited by 88 publications
(44 citation statements)
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“…Plant roots can alter physical and chemical properties of the sediment, influencing geochemical fractionation of metals and thus availability to the plant (Caçador et al, 1996b(Caçador et al, , 1999Doyle & Otte, 1997;Lacerda et al, 1997;Otero & Macías, 2002;Mucha et al, 2005). Factors affecting bioavailability of metals to the marsh plants include pH, redox potential, salinity, particle size and organic matter content (Alloway, 1990;Williams et al, 1994a).…”
Section: Introductionmentioning
confidence: 97%
“…Plant roots can alter physical and chemical properties of the sediment, influencing geochemical fractionation of metals and thus availability to the plant (Caçador et al, 1996b(Caçador et al, , 1999Doyle & Otte, 1997;Lacerda et al, 1997;Otero & Macías, 2002;Mucha et al, 2005). Factors affecting bioavailability of metals to the marsh plants include pH, redox potential, salinity, particle size and organic matter content (Alloway, 1990;Williams et al, 1994a).…”
Section: Introductionmentioning
confidence: 97%
“…As mentioned also above, the sediment between the root system of J. maritimus showed a higher accumulation capacity for Hg when compared with the sediment between the roots of H. portulacoides. The differences observed in the present study may be attributable to higher oxidising activity of H. portulacoides roots in the sediment when compared with the J. maritimus roots, probably due to fact that roots of J. maritimus liberate exudates (organic acids) that could act as complexing agents for metals, reducing their availability to plants (Mucha et al 2005). Therefore, J. maritimus root exhibited less Hg accumulation compared with roots of H. portulacoides that consequently lead to higher sediment-Hg vegetated by J. maritimus than H. porulacoides-vegetated sediments.…”
Section: Discussionmentioning
confidence: 46%
“…Moreover, these sediment charateristics are also affected by the plant vegetation and the cumulative effect of the processes mentioned above, and thus influence the complex interaction processes between plants and surrounding sediments (Greger 2004;Mucha et al 2005;Almeida et al 2006a, b;Válega et al 2008a, b).…”
Section: Introductionmentioning
confidence: 96%
“…Plants actively modify conditions in the rhizosphere by changes in redox conditions (Jacob and Otte 2004a, b;Mucha et al 2005), mineral precipitation/dissolution (Mucha et al 2010), and exudation of organic substances capable of complexing metals and changing their bioavailability (Parker et al 2001;Hammer and Keller 2002;Berkelaar and Hale 2003;Magdziak et al 2011). Rootexuded LMWOAs influence the behaviour of nutrients and trace metals, either enhancing or reducing their availability, by directly affecting acidification, chelation, precipitation and redox reactions, or indirectly, through their effects on microbial activity, physical and chemical properties of the rhizosphere and root growth pattern (Tao et al 2004;Kidd et al 2009;Li et al 2009).…”
Section: Discussionmentioning
confidence: 99%