Metagenomic Insights into the Bacterial Functions of a Diesel-Degrading Consortium for the Rhizoremediation of Diesel-Polluted Soil

被引：71

作者：

Garrido-Sanz, Daniel ^{[1
]}

Redondo-Nieto, Miguel ^{[1
]}

Guirado, Maria ^{[2
]}

Pindado Jimenez, Oscar ^{[2
]}

Millan, Rocio ^{[2
]}

Martin, Marta ^{[1
]}

Rivilla, Rafael ^{[1
]}

机构：

[1] Univ Autonoma Madrid, Dept Biol, Fac Ciencias, Darwin 2, E-28049 Madrid, Spain

[2] Ctr Invest Energet Medioambientales & Tecnol, Ave Complutense 40, Madrid 28040, Spain

来源：

GENES | 2019年 / 10卷 / 06期

基金：

欧盟地平线“2020”;

关键词：

rhizoremediation; diesel; bacteria; consortium; metagenomics; PAHs; TPH; POLYCYCLIC AROMATIC-HYDROCARBONS; PETROLEUM-CONTAMINATED SOIL; N-ALKANE DEGRADATION; NAPHTHALENE DIOXYGENASE; MICROBIAL-DEGRADATION; HEAVY-METALS; BIODEGRADATION; OXIDATION; MONOOXYGENASE; RHIZOSPHERE;

D O I：

10.3390/genes10060456

中图分类号：

Q3 [遗传学];

学科分类号：

071007 ; 090102 ;

摘要：

Diesel is a complex pollutant composed of a mixture of aliphatic and aromatic hydrocarbons. Because of this complexity, diesel bioremediation requires multiple microorganisms, which harbor the catabolic pathways to degrade the mixture. By enrichment cultivation of rhizospheric soil from a diesel-polluted site, we have isolated a bacterial consortium that can grow aerobically with diesel and different alkanes and polycyclic aromatic hydrocarbons (PAHs) as the sole carbon and energy source. Microbiome diversity analyses based on 16S rRNA gene showed that the diesel-degrading consortium consists of 76 amplicon sequence variants (ASVs) and it is dominated by Pseudomonas, Aquabacterium, Chryseobacterium, and Sphingomonadaceae. Changes in microbiome composition were observed when growing on specific hydrocarbons, reflecting that different populations degrade different hydrocarbons. Shotgun metagenome sequence analysis of the consortium growing on diesel has identified redundant genes encoding enzymes implicated in the initial oxidation of alkanes (AlkB, LadA, CYP450) and a variety of hydroxylating and ring-cleavage dioxygenases involved in aromatic and polyaromatic hydrocarbon degradation. The phylogenetic assignment of these enzymes to specific genera allowed us to model the role of specific populations in the diesel-degrading consortium. Rhizoremediation of diesel-polluted soil microcosms using the consortium, resulted in an important enhancement in the reduction of total petroleum hydrocarbons (TPHs), making it suited for rhizoremediation applications.

引用

页数：19

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