Transfer of radiocesium from rhizosphere soil to four cruciferous vegetables in association with a Bacillus pumilus strain and root exudation. (November 2016) - Aung, Han Phyo
Abstract: This study was carried out to assess the effect of Bacillus pumilus on the roots of four cruciferous vegetables with different root structures in regard to enhancement of 137 Cs bioavailability in contaminated rhizosphere soil. Results revealed that B. pumilus inoculation did not enhance the plant biomass of vegetables, although it increased root volume and root surface areas of all vegetables except turnip. The pH changes due to rhizosphere acidification by B. pumilus inoculation and root exudation did not affect the bioavailability of 137 Cs. However, concentrations of 137 Cs in plant tissues and soil-to-plant transfer values increased as a result of the larger root volume and root surface area of vegetables due to inoculation. Moreover, leafy vegetables, which possessed larger root volume and root surface areas, had a higher 137 Cs transfer value than root vegetables. Highlights: PGPR inoculation increased root volume and surface area of tested vegetables. Leafy vegetables had a larger root volume and root surface area. Root exudation did not enhance 137 Cs bioavailability. PGPR inoculation increased 137 Cs concentration and transfer.