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Influence of silicon on arsenic uptake and toxicity in lettuce
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. Stockholm University, Sweden.ORCID iD: 0000-0002-2715-2931
2015 (English)In: Journal of Applied Botany and Food Quality / Angewandte Botanik, ISSN 1613-9216, E-ISSN 1439-040X, Vol. 88, 234-240 p.Article in journal (Refereed) Published
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Text
Abstract [en]

Lettuce grown in soil is found to contain high concentrations of arsenic (As). This paper investigates the uptake and speciation of As in lettuce as well as the influence of silicon (Si) on As uptake, since Si may decrease it. Lettuce plants were cultivated in nutrient solution containing arsenite or arsenate with or without silicate. The uptake and distribution of As between roots and shoots, As accu-mulation in cell walls, As speciation, and toxic effects on growth were analysed. Results indicate that arsenite was more toxic to lettuce than was arsenate. Silicate decreased arsenate toxicity but had little effect on arsenite toxicity. In contrast, Si decreased arsenite uptake more than arsenate uptake. The concentration of arsenate was higher than that of arsenite in the plants independent of the As species added. When arsenate was added, the As concentration in shoots was half of that in the roots and this distribution did not change with Si addition. When arsenite was added, approximately 10% of As was found in the shoots and 90% in the roots; this pattern changed in the presence of Si, and As became evenly distributed in the plant. In both roots and shoots, approximately 40% of the As was found in the cell wall fraction; when arsenite was added, the presence of Si increased this fraction to 47%, but only in the shoots. The extraction efficiency when analysing the As species was lower in shoots than in roots, especially in the presence of arsenite and Si. The opposite was found for As concentration in pellets after extraction. This indicated variation in the binding strength of arsenite and arsenate between roots and shoots and between Si-and non-Si-treated plants.

Place, publisher, year, edition, pages
Druckerei und Verlag Liddy Halm , 2015. Vol. 88, 234-240 p.
Keyword [en]
arsenate, arsenic, concentration (composition), dose-response relationship, leafy vegetable, nutrient availability, nutrient uptake, root system, shoot, silicon, soil nutrient, solution, toxicity test, Lactuca
National Category
Plant Biotechnology
Identifiers
URN: urn:nbn:se:kth:diva-181229DOI: 10.5073/JABFQ.2015.088.034ISI: 000364715500005Scopus ID: 2-s2.0-84945185903OAI: oai:DiVA.org:kth-181229DiVA: diva2:901644
Note

QC 20160208

Available from: 2016-02-08 Created: 2016-01-29 Last updated: 2017-03-22Bibliographically approved
In thesis
1. ARSENIC REMOVAL BY PHYTOFILTRATION AND SILICON TREATMENT: A POTENTIAL SOLUTION FOR LOWERING ARSENIC CONCENTRATIONS IN FOOD CROPS
Open this publication in new window or tab >>ARSENIC REMOVAL BY PHYTOFILTRATION AND SILICON TREATMENT: A POTENTIAL SOLUTION FOR LOWERING ARSENIC CONCENTRATIONS IN FOOD CROPS
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Use of arsenic-rich groundwater for crop irrigation can increase the arsenic (As) content in food crops and act as a carcinogen, compromising human health. Using aquatic plant based phytofiltration is a potential eco-technique for removing arsenic from water. The aquatic moss species Warnstorfia fluitans grows naturally in mining areas in northern Sweden, where high concentrations of arsenic occur in lakes and rivers. This species was selected as a model for field, climate chamber and greenhouse studies on factors governing arsenic removal and arsenic phytofiltration of irrigation water. The arsenic and silicon (Si) concentrations in soil, water and plant samples were measured by AAS (atomic absorption spectrophotometry), while arsenite and arsenate species were determined using AAS combined with high pressure liquid chromatography (HPLC) with an anion exchange column. The arsenic content in grains of hybrid and local aromatic rice (Oryza sativa) cultivars with differing arsenic accumulation factor (AF) values was investigated in an arsenic hotspot in Bangladesh. The results showed that arsenic AF was important in identifying arsenic-safer rice cultivars for growing in an arsenic hotspot. The study based on silicon effect on arsenic uptake in lettuce showed that arsenic accumulation in lettuce (Lactuca sativa) could be reduced by silicon addition. The aquatic moss had good phytofiltration capacity, with fast arsenic removal of up to 82% from a medium with low arsenic concentration (1 µM). Extraction analysis showed that inorganic arsenic species were firmly bound inside moss tissue. Absorption of arsenic was relatively higher than adsorption in the moss. Regarding effects of different abiotic factors, plants were stressed at low pH (pH 2.5) and arsenic removal rate was lower from the medium, while arsenic efflux occurred in arsenate-treated medium at low (12°C) and high (30°C) temperature regimes. Besides these factors, low oxygenation increased the efficiency of arsenic removal from the medium. Finally, combining W. fluitans as a phytofilter with a lettuce crop on a constructed wetland significantly reduced the arsenic content in edible parts (leaves) of lettuce. Thus W. fluitans has great potential for use as an arsenic phytofilter in temperate regions.

Place, publisher, year, edition, pages
KTH: KTH Royal Institute of Technology, 2017. 49 p.
Series
TRITA-LWR. PHD, ISSN 1650-8602 ; 2017:02
Keyword
aquatic moss, grain, rice, lettuce, macrophyte, phytoremediation, speciation, temperature, oxygenation, wetland.
National Category
Earth and Related Environmental Sciences Other Environmental Engineering Botany Bio Materials Inorganic Chemistry
Research subject
Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-203995 (URN)978-91-7729-332-3 (ISBN)
Public defence
2017-04-20, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170323

Available from: 2017-03-23 Created: 2017-03-22 Last updated: 2017-03-24Bibliographically approved

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