Endophytic bacteria promote biomass production and mercury-bioaccumulation of Bermuda grass and Indian goosegrass. Issue 11 (19th September 2022)

• Record Type: Journal Article
• Authors: Ustiatik, Reni; Nuraini, Yulia; Suharjono, Suharjono; Jeyakumar, Paramsothy; Anderson, Christopher W. N.; Handayanto, Eko
• Is Part Of: International journal of phytoremediation. Volume 24:Issue 11(2022)
• Page Start: 1184
• Page End: 1192
• Publication Date: 2022-09-19
• Subjects: Growth-promoting endophytic bacteria -- Hg-accumulating grass -- Hg-contaminated site -- phytoremediation -- translocation factor; Phytoremediation -- Periodicals; 628.5
• DOI: 10.1080/15226514.2021.2023461
• Languages: English
• ISSNs: 1522-6514

Abstract

Abstract: Plant growth-promoting endophytic bacteria can potentially improve the biomass production of Hg-accumulating grasses, resulting in improved Hg extraction from contaminated soils. This study aimed to analyze the effect of inoculation of Hg-resistant endophytic bacteria (i) Jeotgalicoccus huakuii ( B1 ) and (ii) Bacillus amyloliquefaciens ( B2 ), as single and consortium inoculant, on biomass production and Hg bioaccumulation of Bermuda grass ( R1 ) and Indian goosegrass ( R2 ) planted as monoculture and mixed cropping. The grass seeds were surface-sterilized before the inoculation. Both inoculated seeds with B1 and B2 (treatments) and uninoculated seeds were sown separately in sterilized sand. Grass seedlings of both treatments and control were replanted in the washed and sterilized sand medium, spiked with HgCl2 (100 mg kg −1 ). A subset of grass was harvested at 0, 4, 6, and 10 weeks after planting to measure biomass production and Hg bioaccumulation. The results showed that bacterial inoculation enhanced the grass biomass by 52.68% and Hg bioaccumulation by 47.76%. Mercury residue of Hg-spiked sand treated with the bacterial consortium was reduced by 80%. This suggests that endophytic bacteria can improve grass biomass production and enhance Hg bioaccumulation in grass biomass. Graphical Abstract: UF0001 HIGHLIGHTS: Endophytic bacteria that reside within Bermuda grass and Indian goosegrass displayed beneficial associations for modulating Hg phytoremediation. Inoculation of Hg-resistant endophytic bacteria increased biomass production (root and shoot) of Bermuda grass and Indian goosegrass.