Co-cropping with three phytoremediation crops influences rhizosphere microbiome community in contaminated soil
| Autor: | Frederic E. Pitre, Emmanuel Gonzalez, Nicholas J. B. Brereton, Dominic Desjardins, Michel Labrecque |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
010504 meteorology & atmospheric sciences 010501 environmental sciences Biology Rhizobacteria Plant Roots 01 natural sciences Soil Salix miyabeana RNA Ribosomal 16S Soil Pollutants Environmental Chemistry Microbiome Waste Management and Disposal Soil Microbiology 0105 earth and related environmental sciences 2. Zero hunger Rhizosphere Microbiota fungi food and beverages 15. Life on land biology.organism_classification Pollution Phytoremediation Biodegradation Environmental Agronomy 13. Climate action Metagenomics Monoculture Festuca arundinacea |
| Zdroj: | Science of The Total Environment. 711:135067 |
| ISSN: | 0048-9697 |
| DOI: | 10.1016/j.scitotenv.2019.135067 |
| Popis: | Human industrial activities have left millions of hectares of land polluted with trace element metals and persistent organic pollutants (POPs) around the world. Although contaminated sites are environmentally damaging, high economic costs often discourage soil remediation efforts. Phytoremediation is a potential green technology solution but can be challenging due to the diversity of anthropogenic contaminants. Co-cropping could provide improved tolerance to diverse soil challenges by taking advantage of distinct crop capabilities. Co-cropping of three species with potentially complementary functions, Festuca arundinacea, Salix miyabeana and Medicago sativa, perform well on diversely contaminated soils. Here, rhizosphere microbiomes of each crop in monoculture and in all co-cropping combinations were compared using 16S rRNA gene amplification, sequencing and differential abundance analysis. The hyperaccumulating F. arundinacea rhizosphere microbiome included putative plant growth promoting bacteria (PGPB) and metal tolerance species, such as Rhizorhapis suberifaciens, Cellvibrio fibrivorans and Pseudomonas lini. The rhizosphere microbiome of the fast-growing tree S. miyabeana included diverse taxa involved in POP degradation, including the species Phenylobacterium panacis. The well-characterised nitrogen-fixing M. sativa microbiome species, Sinorhizobium meliloti, was identified alongside others involved in nutrient acquisition and putative yet-to-be-cultured Candidatus saccharibacteria (TM7-1 group). The majority of differentially abundant rhizosphere-associated bacterial species were maintained in co-cropping pairs, with pairs having higher numbers of differentially abundant taxa than monocultures in all cases. This was not the case when all three crops were co-cropped, where most host-specific bacterial species were not detected as differentially abundant, indicating the potential for reduced rhizosphere functionality. The crops cultivated in pairs here retained rhizosphere microbiome bacteria involved in these monoculture ecosystem services of plant growth promotion, POP tolerance and degradation, and improved nutrient acquisition. These findings provide a promising outlook of the potential for complementary co-cropping strategies for phytoremediation of the multifaceted anthropogenic pollution which can disastrously affect soils around the world. |
| Databáze: | OpenAIRE |
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