Mechanisms behind pH changes by plant roots and shoots caused by elevated concentration of toxic elements

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Javed, Muhammad Tariq,1983-Stockholms universitet,Botaniska institutionen,Plant Physiology (författare)

Mechanisms behind pH changes by plant roots and shoots caused by elevated concentration of toxic elements

BokEngelska2011

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Stockholm :Department of Botany, Stockholm University,2011
40 s.
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:su-64324
ISBN:9789174474138
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-64324URI

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Språk:engelska
Sammanfattning på:engelska

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At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Submitted. Paper 3: Submitted. Paper 4: Manuscript.
Toxic elements are present in polluted water from mines, industrial outlets, storm water etc. Wetland plants take up toxic elements and increase the pH of the medium. In this thesis was investigated how the shoots of submerged plants and roots of emergent plants affected the pH of the surrounding water in the presence of free toxic ions. The aim was to clarify the mechanisms by which these plants change the surrounding water pH in the presence of toxic ions. The influence of Elodea canadensis shoots on the pH of the surrounding water was studied in the presence of cadmium (Cd) at low initial pH (4-5). The involvement of photosynthetic activity in the pH changes was investigated in the presence and absence of Cd. The cytosolic, vacuolar and apoplasmic pH changes as well as cytosolic Cd changes in E. canadensis were monitored. The influence of Eriophorum angustifolium roots on the pH of the surrounding water was investigated in the presence of a combination of Cd, copper, lead, zinc and arsenic at low initial pH (3.5). Eriophorum angustifolium root exudates were analyzed for organic acids. Elodea canadensis shoots increased the pH of the surrounding water, an effect more pronounced with increasing Cd levels and/or increasing plant biomass and increased plant Cd uptake. The pH increase in the presence of free Cd ions was not due to photosynthesis or proton uptake across the plasmalemma or tonoplast. Cadmium was initially sequestered in the apoplasm of E. canadensis and caused its acidosis. Eriophorum angustifolium roots increased the surrounding water pH and this effect was enhanced in the presence of arsenic and metals. This pH increase was found to depend partly on the release of oxalic acid, formic acid and succinic acid by the plants. In conclusion, E. canadensis shoots and E. angustifolium roots were found to increase the low initial pH of the surrounding water. The pH modulation by these species was enhanced by low levels of free toxic ions in the surrounding water.

Ämnesord och genrebeteckningar

NATURVETENSKAP Biologi Botanik hsv//swe
NATURAL SCIENCES Biological Sciences Botany hsv//eng
Elodea canadensis
Eriophorum angustifolium
fluorescence microscopy
mechanisms
metals and metalloid
pH changes
protoplasts
phytofiltration
phytostabilization
root exudates
Plant Physiology
växtfysiologi

Biuppslag (personer, institutioner, konferenser, titlar ...)

Greger, Maria,DrStockholms universitet,Botaniska institutionen (preses)
Lindberg, Sylvia,ProfessorStockholms universitet,Botaniska institutionen (preses)
Otte, Marinus L.,ProfessorNorth Dakota State University, Department of Biological Sciences, USA (opponent)
Stockholms universitetBotaniska institutionen (creator_code:org_t)

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Av författaren/redakt...: Javed, Muhammad ...; Greger, Maria, D ...; Lindberg, Sylvia ...; Otte, Marinus L. ...

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NATURVETENSKAP: NATURVETENSKAP; och Biologi; och Botanik

Av lärosätet: Stockholms universitet

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