Adarme-Duran Carlos A, Castillo Elianna, Brandão Pedro F B
Facultad de Ciencias, Instituto de Biotecnología - IBUN, Universidad Nacional de Colombia - sede Bogotá, Carrera 30 # 45-03, Bogotá, Colombia.
Facultad de Ciencias, Departamento de Química, Grupo de Estudios para la Remediación y Mitigación de Impactos Negativos al Ambiente (GERMINA), Universidad Nacional de Colombia - sede Bogotá, Carrera 30 # 45- 03, Bogotá, Colombia.
World J Microbiol Biotechnol. 2025 Aug 8;41(8):302. doi: 10.1007/s11274-025-04482-9.
This work reports the isolation of 54 ureolytic bacteria with microbiologically induced carbonate precipitation (MICP) activity from Theobroma cacao L. rhizosphere soils with Cd concentration ranging from 0.49 to 21.29 mg kg. Analysis of the 16 S rRNA gene showed the isolates belong to the genera Serratia, Pseudomonas, Comamonas, Klebsiella, Bacillus, Citrobacter, Flavobacterium, Delftia, and Stenotrophomonas. They showed ureolytic activity between 0.31 and 1.01 µmol NH mL h and produced the phytohormone indole acetic acid (IAA). Interestingly, Cd was observed to increase ureolytic activity and did not affect the IAA production of various isolates. Cadmium removal in solution ranged from 4.4 to 87.0% after 48 h. Strains Serratia sp. 89a, Klebsiella sp. 76 h, and Stenotrophomonas sp. 67w exhibited the best performance (> 80%). Cadmium removal through MICP by the genera Delftia, Flavobacterium, and Klebsiella is reported for the first time. Results suggest the isolated bacteria have the potential for Cd bioremediation and could be used to alleviate metal-induced stress through IAA production.
这项研究报告了从镉浓度范围为0.49至21.29毫克/千克的可可树(Theobroma cacao L.)根际土壤中分离出54株具有微生物诱导碳酸盐沉淀(MICP)活性的尿素分解菌。16S rRNA基因分析表明,这些分离株属于沙雷氏菌属、假单胞菌属、丛毛单胞菌属、克雷伯氏菌属、芽孢杆菌属、柠檬酸杆菌属、黄杆菌属、代尔夫特菌属和嗜麦芽窄食单胞菌属。它们的尿素分解活性在0.31至1.01微摩尔NH₃/毫升·小时之间,并产生植物激素吲哚乙酸(IAA)。有趣的是,观察到镉会增加尿素分解活性,并且不影响各种分离株的IAA产生。48小时后,溶液中的镉去除率在4.4%至87.0%之间。沙雷氏菌属89a菌株、克雷伯氏菌属76h菌株和嗜麦芽窄食单胞菌属67w菌株表现出最佳性能(>80%)。首次报道了代尔夫特菌属、黄杆菌属和克雷伯氏菌属通过MICP去除镉的情况。结果表明,分离出的细菌具有镉生物修复的潜力,并且可用于通过产生IAA来缓解金属诱导的胁迫。