Phytodesalination of a salt-affected soil with the halophyte Sesuvium portulacastrum L. to arrange in advance the requirements for the successful growth of a glycophytic crop. Bioresour Technol

Laboratory of Plant Adaptation to Abiotic Stresses (LAPSA), Biotechnology Centre of Borj Cedria, P.O. Box 901, 2050 Hammam-Lif, Tunisia.
Bioresource Technology (Impact Factor: 4.49). 09/2010; 101(17):6822-8. DOI: 10.1016/j.biortech.2010.03.097
Source: PubMed


In the present work, we studied the potential of the obligate halophyte, Sesuvium portulacastrum L., to desalinize an experimentally-salinized soil after the following criteria: (i) decrease in soil salinity and sodicity, (ii) plant biomass capacity to accumulate sodium ions, and (iii) phytodesalinized soil quality (equivalent to growth of a glycophytic test culture of Hordeum vulgare L.). The cultivation of the halophyte on the salinized soil (phytodesalination culture) led to a marked absorption of Na(+) ions by S. portulacastrum roots and their accumulation in the above-ground biomass up to 872 mg plant(-1) and 4.36 g pot(-1) (about 1 tha(-1)). The decrease in salinity and sodicity of the phytodesalinized soil significantly reduced the negative effects on growth of the test culture of H. vulgare. Furthermore, the phytodesalination enabled H. vulgare plants to keep a high water content and to develop a higher biomass with relatively high K and low Na contents.

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Available from: Hans-Werner Koyro, Jan 29, 2014
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    • "In recent years, the use of halophytes as a natural way of reducing water and soil salinity has been proposed (Ke-Fu, 1991; Rabhi et al., 2010; Lokhande et al., 2012). Halophytes are plants with an adapted tolerance to saline conditions that allows them to prosper in salinities that are harmful for non-halophytes (Glenn et al., 2010; Waisel, 1972). "
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    ABSTRACT: The use of halophytes in constructed wetlands (CWs) for phytodesalination has been recently suggested as a strategy for dealing with excess salt, which causes land degradation and has detrimental effects on agricultural productivity. Salinity in drylands is enhanced by strong solar radiation and increased evapotranspiration, and poses additional challenges for decentralized water-treatment systems such as CWs. We tested the potential use of a horizontal subsurface flow CW (HSSF CW) planted with the halophyte Bassia indica to polish treated municipal wastewater quality and reduce salinity, using a pilot system containing eight flow cells. The system was operated under continuous flow of synthetic, secondary level-treated wastewater at a rate of 480–660 ml/h, which resulted in a retention time of approximately 2 days. Water fluxes, and nutrient and salt concentrations in the water were measured and compared to those in flow cells without plants. Plant height was measured periodically and biomass and salt concentrations were recorded at harvest. Removal of biological oxygen demand, and reduction in fecal coliforms and turbidity were evident and similar in planted and non-planted cells. Significant salt uptake was measured in the planted cells, with the amount of Na+ uptake directly related to plant biomass; however, the overall salinity of the treated wastewater increased despite salt uptake by B. indica due to enhanced evapotranspiration. This study reaffirms the notion that halophytes in CWs have the potential capacity for direct uptake of salts. Nevertheless, efficient salt phytoremediation in arid and semi-arid climates will require specific application of plants and relatively short hydraulic residence time to minimize evapotranspiration.
    Full-text · Article · Sep 2014 · Ecological Engineering
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    • "Nasir [95] conducted a field study in Jordan valley to investigate the effects of growing three types of salt accumulator halophyte species, Tamarix aphylla, Atriplex nummularia, and A. halimus, on chemical properties of saline sodic soil and these halophytic species decreased the soil salinity at the end of the experiment. Rabhi et al. [96] observed that Sesuvium portulacastrum, an obligate halophyte, decreased the soil salinity and sodicity. "
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    ABSTRACT: Salinity is one of the rising problems causing tremendous yield losses in many regions of the world especially in arid and semiarid regions. To maximize crop productivity, these areas should be brought under utilization where there are options for removing salinity or using the salt-tolerant crops. Use of salt-tolerant crops does not remove the salt and hence halophytes that have capacity to accumulate and exclude the salt can be an effective way. Methods for salt removal include agronomic practices or phytoremediation. The first is cost- and labor-intensive and needs some developmental strategies for implication; on the contrary, the phytoremediation by halophyte is more suitable as it can be executed very easily without those problems. Several halophyte species including grasses, shrubs, and trees can remove the salt from different kinds of salt-affected problematic soils through salt excluding, excreting, or accumulating by their morphological, anatomical, physiological adaptation in their organelle level and cellular level. Exploiting halophytes for reducing salinity can be good sources for meeting the basic needs of people in salt-affected areas as well. This review focuses on the special adaptive features of halophytic plants under saline condition and the possible ways to utilize these plants to remediate salinity.
    Full-text · Article · Jul 2014 · BioMed Research International
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    • "Despite, soil microorganisms have the ability to adapt or tolerate osmotic stress caused by salinity (Sparling et al., 1989; Wichern et al., 2006; Yuan et al., 2007). Numerous physical, chemical, and biological approaches were established to reclaim salt-affected soils (Qadir et al., 2007; Wong et al., 2009; Rabhi et al., 2010; Feizi et al., 2010; Mokoi and Verplancke, 2010). The application of organic matter increases soil microbial biomass and some soil enzymatic activities such as urease, alkaline phosphatase and -glucosidase (Lakhdar et al., 2008). "
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    ABSTRACT: The effectiveness of compost supply at several doses (0, 50, 100, and 150 t/ha) to a saline soil was studied using municipal solid waste (MSW) and palm waste (PW) composts. The experiment was carried out in pots under cultivation of Polypogon monspeliensis (halophyte forage species) and Hordeum vulgare (common forage species) and lasted three months. The investigation focused on some selected soil physico-chemical properties, soil microbial biomass, and ten soil enzymatic activities; Arylsulfatase (ARY), dehydrogenase (DEH), mu-glycosidase (mu-GLU), protease (PRO), urease (URE), invertase (INV), Fluorescein diacetate hydrolase (FDAH), catalase (CAT), acid and alkaline phosphatases (PHO). Both amendments improve markedly the saline soil quality. They ameliorate the physico-chemical properties. The increase of soil pH is regarded as an interesting fact and is usually proportional to the compost application rate. Electrical conductivity increased proportionally to the applied rates. Soil carbon and nitrogen amounts were also improved and the highest raise (7.5-folds) was noted for carbon. According to the substantial increase of the organic matter, levels of measured microbial biomass and several enzyme activities in saline soil were improved. DEH activity which proposed as a measure of overall microbial activity exhibited a significant increase only at dose 2 (100 t/ha). Consequently, One hundred tones of composts per hectare, under which some enzymes exhibited an optimal of activity and metal accumulation can be minimized, appeared an interesting rate for saline soil amendment.
    Full-text · Article · Nov 2013 · Ecological Engineering
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