College of Food and Biological Engineering, Xihua University, Chengdu 610039, China; Food Microbiology Key Laboratory of Sichuan Province, Xihua University, Chengdu 610039, China.
College of Food and Biological Engineering, Xihua University, Chengdu 610039, China; Food Microbiology Key Laboratory of Sichuan Province, Xihua University, Chengdu 610039, China.
J Hazard Mater. 2024 Nov 5;479:135609. doi: 10.1016/j.jhazmat.2024.135609. Epub 2024 Aug 22.
Green agriculture faced challenges due to the shortage of efficient cadmium (Cd)-resistant plant growth-promoting bacteria (CdR-PGPB) and their low survival rate and activity during application. In this study, a diverse range of efficient CdR-PGPB were isolated from the rhizosphere soil of Desmodium elegans, especially those with high phosphate-solubilizing capabilities (272.87-450.45 mg L). Two highly efficient CdR-PGPB namely, XH1 and XH3 were loaded on to rice husk biochar (RHB) and pig bone biochar (PBB), labelled as RHBM and PBBM respectively. This study aimed to explore their effectiveness and mechanisms in promoting maize growth in a Cd-contaminated planting system. Results showed that PBBM performed best among all treatments. It significantly decreased soil phytoavailable Cd by 53.19 % and Cd content in maize shoot by 85.89 %. It also increased soil available phosphorus by 145.72 %, soil alkaline phosphatase activity by 76.34 %, maize shoot/root biomass by 47.06 %/67.98 %, Chlorophyll (a/b) content by 66.80 %/134.13 % and peroxidase activity by 171.96 %. These results were achieved through the synergistic action of efficient CdR-PGPB and PBB. Therefore, PBBM proved to be a promising and innovative application technique for sustainable agricultural development in Cd-contaminated farmland ecosystems.
绿色农业面临挑战，因为缺乏高效的耐镉植物促生菌（CdR-PGPB），并且在应用过程中它们的存活率和活性较低。在这项研究中，从山蚂蝗（Desmodium elegans）根际土壤中分离出了多种高效的耐镉植物促生菌（CdR-PGPB），特别是那些具有高溶磷能力（272.87-450.45 mg L）的细菌。两种高效的耐镉植物促生菌（CdR-PGPB），即 XH1 和 XH3，被负载到稻壳生物炭（RHB）和猪骨生物炭（PBB）上，分别标记为 RHBM 和 PBBM。本研究旨在探索它们在促进镉污染种植系统中玉米生长方面的有效性和机制。结果表明，所有处理中 PBBM 的效果最好。它显著降低了土壤有效态镉 53.19%，降低了玉米地上部镉含量 85.89%。它还增加了土壤有效磷 145.72%，土壤碱性磷酸酶活性 76.34%，玉米地上部/根生物量 47.06%/67.98%，叶绿素（a/b）含量 66.80%/134.13%，过氧化物酶活性 171.96%。这些结果是通过高效耐镉植物促生菌和 PBB 的协同作用实现的。因此，PBBM 被证明是一种有前途和创新的应用技术，可用于可持续农业发展在镉污染农田生态系统中。
