Chen Zhi-Qun, Tan Ai-Juan, Wan Yi-Fei, Dong Yu-Han, Yang Xiao, Yang Gui-Li
Key Laboratory of Plant Resources Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), Guizhou Key Lab of Agro-Bioengineering, Institute of Agro-Bioengineering/College of Life Sciences, Guizhou University, Guiyang, 550025, Guizhou, China.
College of Life Sciences, Guizhou University, Guiyang, 550025, Guizhou, China.
Curr Microbiol. 2025 Aug 12;82(10):447. doi: 10.1007/s00284-025-04451-3.
As cadmium (Cd) pollution increases, ecological security becomes increasingly endangered, highlighting the significance of exploring and optimizing sustainable remediation technologies. Phytoremediation, recognized as a promising strategy for environmental restoration, is enhanced when combined with microorganisms, particularly endophytes. Duckweed, known for its high Cd accumulation capacity, holds great potential for remediating Cd pollution. However, the impact of endophytic microorganisms on duckweed's remediation of Cd pollution remains unclear. This study focuses on the endophytic bacterium Paenibacillus illinoisensis Y11 to investigate its effects on duckweed (Lemna minor) growth and duckweed's capacity to remediate Cd pollution. The results indicate that strain Y11 can successfully colonize duckweed under Cd stress, and the colonization by strain Y11 can significantly promote duckweed growth and increase its Cd removal rate. Strain Y11 was evaluated in vitro for plant growth-promoting properties, revealing the capacity to synthesize indole-3-acetic acid and siderophores, solubilize phosphate, and produce 1-aminocyclopropane-1-carboxylate deaminase, all of which contribute to plant growth. This study not only provides valuable microbial resources to enhance the Cd pollution remediation capacity of duckweed, but also establishes a theoretical foundation for the widespread application of endophytic microorganisms in plant-microbe combined remediation techniques.
随着镉（Cd）污染的加剧，生态安全受到的威胁日益严重，这凸显了探索和优化可持续修复技术的重要性。植物修复作为一种有前景的环境修复策略，与微生物尤其是内生菌结合时效果更佳。浮萍以其高镉积累能力而闻名，在修复镉污染方面具有巨大潜力。然而，内生微生物对浮萍修复镉污染的影响尚不清楚。本研究聚焦于内生细菌伊利诺伊芽孢杆菌Y11，以探究其对浮萍（小眼浮萍）生长及浮萍修复镉污染能力的影响。结果表明，菌株Y11能够在镉胁迫下成功定殖于浮萍，且菌株Y11的定殖能显著促进浮萍生长并提高其镉去除率。对菌株Y11进行了体外植物促生特性评估，结果显示它具有合成吲哚 - 3 - 乙酸和铁载体、溶解磷酸盐以及产生1 - 氨基环丙烷 - 1 - 羧酸脱氨酶的能力，所有这些都有助于植物生长。本研究不仅为增强浮萍的镉污染修复能力提供了宝贵的微生物资源，也为内生微生物在植物 - 微生物联合修复技术中的广泛应用奠定了理论基础。
