Aug 9, 2005

Characterization of phosphate accumulation in Lolium multiflorum for remediation of phosphorus-enriched soils

Environmental Science & Technology
Nilesh C Sharma, Shivendra V Sahi

Abstract

Deterioration in water quality caused by the movement of excessive soil P has created a condition necessary for the development of a sustainable P remediation technology. In this investigation, the phytoremediation potential of Gulf and Marshall ryegrass (Lolium multiflorum) grown in a greenhouse was determined under varying conditions of soil P concentration, pH, and temperature. Both genotypes demonstrated P accumulations > or =1% shoot dry weight depending on soil P concentrations (0-10 g of P/kg of soil), with higher shoot P in Gulf than Marshall ryegrass. An increase in plant biomass was proportional to the increasing concentrations of P up to a level of 10 g of P/kg of soil. The effect of soil pH on plant uptake of P was noticeable with a significant rise in shoot P in acidic soil (pH 5.6) as compared to soil with pH 7.8. Significant differences were observed in the biomass productivity and shoot P accumulation at varying temperatures in both grass types. The patterns of acid phosphomonoesterase and phytase activities in plant roots were interesting, activities being 2-fold higher in alkaline soil than acidic soil in both genotypes. The effect of P supply on the enzyme activity was also distinct, as plants growing in a hi...Continue Reading

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Mentioned in this Paper

Acid Phosphatase
Lolium multiflorum
Uptake
Properdin Deficiency, X-LINKED
Avian Crop
Phosphate Measurement
Plant bulb
Etiology
Lolium (plant)
Water Pollutants

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