A recent study published in the Journal of Hazardous Materials introduces a promising bioremediation technique using plant endophytes to combat chromium (Cr) pollution in soil and water. Researchers Jie Yuan, Zhihao Pang, Qizhen Liu, Lukuan Huang, Yaru Liu, Jiayuan Liao, Lishan Luo, and Ying Feng investigated the effectiveness of using biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More loaded with specific endophytes, compared to commercial bacteria, for reducing Cr contamination.

Chromium pollution, particularly the toxic hexavalent form (Cr(VI)), is a significant environmental problem, affecting soil fertility and posing health risks through the food chain. Traditional methods of Cr(VI) reduction face challenges such as high costs and potential secondary pollution. In contrast, microbial remediation, which employs microorganisms to neutralize pollutants, offers a more sustainable solution but suffers from issues like decreased microbial activity in polluted environments.

The study used corn straw biochar as a carrier for different endophytes: Serratia sp. Y-13 (BSR1), Serratia nematodiphila (BSR2), Lysinibacillus sp. strain SePC-36 (BLB1), Lysinibacillus mangiferihumi strain WK63 (BLB2), and the commercial Shewanella oneidensis MR-1 (BSW). Results showed that endophyte-loaded biochar, especially BSR1, significantly outperformed the commercial strain in reducing Cr(VI) in soil and water. This biochar not only lowered soil Cr(VI) concentrations but also enhanced soil fertility, reduced plant Cr uptake, and promoted lettuce growth.

Redundancy analysis and structural equation modeling indicated that endophyte-loaded biochar influences plant and soil health by altering microbial communities. This innovative approach demonstrates the potential of endophyte-loaded biochar as an effective, environmentally friendly strategy for remediating Cr pollution and improving agricultural productivity.