Abstract
Soil salinization negatively impacts plant growth and soil structure, which leads to environmental stress and agricultural/economic losses. Improved plant growth during salt-induced ionic and osmotic plant stress is the key to successful phytoremediation of salt-impacted sites. Using plant growth-promoting rhizobacteria (PGPR) in PGPR-Enhanced Phytoremediation Systems (PEPS), positive effects of PGPR on plant biomass and health have been observed in greenhouse and field experiments. Revegetation is arguably the most important aspect of salt phytoremediation and substantial biomass increases occur in PGPR-treated plants in both sodic and saline soils. PGPR protect against inhibition of photosynthesis and plant membrane damage, which suggests that they confer tolerance to plants under salt stress. Using PEPS, decreases in soil salinity are observed due to uptake of sodium and chloride from the soil into foliar plant tissue. Although rates of uptake do not change due to PGPR inoculation, higher plant biomass due to PGPR enhancement of plant performance leads to greater salt uptake on a per area basis relative to that of untreated plants. Significant improvements in plant growth and commensurate sodium chloride uptake, and the results of mass balance studies used to assess the direct impact of ion uptake on actual observed changes in soil salinity, provide evidence that phytoremediation of salt-impacted soil is feasible within acceptable time frames using PEPS.
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The work performed in the lab of B. M. G. was supported by grants from the Natural Sciences and Engineering Research Council of Canada.
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Gerhardt, K.E., MacNeill, G.J., Gerwing, P.D., Greenberg, B.M. (2017). Phytoremediation of Salt-Impacted Soils and Use of Plant Growth-Promoting Rhizobacteria (PGPR) to Enhance Phytoremediation. In: Ansari, A., Gill, S., Gill, R., R. Lanza, G., Newman, L. (eds) Phytoremediation. Springer, Cham. https://doi.org/10.1007/978-3-319-52381-1_2
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