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ABSTRACT: Bacterial and archaeal 16S rRNA and fungal ITS sequences after cover cropping in long-term corn monocultures with and without N fertilization

PROVIDER: PRJNA809390 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR20208100_1.fastq.gz	Fastqsanger.gz
	SRR20208100_2.fastq.gz	Fastqsanger.gz
	SRR20208200_1.fastq.gz	Fastqsanger.gz
	SRR20208200_2.fastq.gz	Fastqsanger.gz
	SRR20208300_1.fastq.gz	Fastqsanger.gz

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Project description:Cover cropping is an effective method to protect agricultural soils from erosion, promote nutrient and moisture retention, encourage beneficial microbial activity, and maintain soil structure. Reusing winter cover crop root channels with the maize roots during the summer allows the cash crop to extract resources from farther niches in the soil horizon. In this study, we investigate how reusing winter cover crop root channels to grow maize (Zea mays L.) affects the composition and function of the bacterial communities in the rhizosphere using 16S rRNA gene amplicon sequencing and metaproteomics. We discovered that the bacterial community significantly differed among cover crop variations, soil profile depths, and maize growth stages. Re-usage of the root channels increased bacterial abundance, and it further increases as we elevate the complexity from monocultures to mixtures. Upon mixing legumes with brassicas and grasses, the overall expression of several steps of the carbon cycle (C) and the nitrogen cycle (N) improved. The deeper root channels of legumes and brassicas compared to grasses correlated with higher bacterial 16S rRNA gene copy numbers and community roles in the respective variations in the subsoil regimes due to the increased availability of root exudates secreted by maize roots. In conclusion, root channel re-use (monocultures and mixtures) improved the expression of metabolic pathways of the important C and N cycles, and the bacterial communities, which is beneficial to the soil rhizosphere as well as to the growing crops.

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