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Aporrectodea caliginosa isolate:Mount Pico

ABSTRACT: Aporrectodea caliginosa Transcriptome - Low altitude population

PROVIDER: PRJNA638118 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR11991310.fastq.gz	Fastqsanger.gz
	SRR11991311.fastq.gz	Fastqsanger.gz
	SRR11991312.fastq.gz	Fastqsanger.gz
	SRR11991313.fastq.gz	Fastqsanger.gz
	SRR11991314.fastq.gz	Fastqsanger.gz

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Molecular insights into high-altitude adaption and acclimatisation of <i>Aporrectodea caliginosa</i>.

Project description:Here, we explore the high-altitude adaptions and acclimatisation of Aporrectodea caliginosa Population diversity is assessed through mitochondrial barcoding, identifying closely related populations across the island of Pico (Azores). We present the first megabase N50 assembly size (1.2 Mbp) genome for A. caliginosa High- and low-altitude populations were exposed experimentally to a range of oxygen and temperature conditions, simulating altitudinal conditions, and the transcriptomic responses explored. SNP densities are assessed to identify signatures of selective pressure and their link to differentially expressed genes. The high-altitude A. caliginosa population had lower differential expression and fewer co-expressed genes between conditions, indicating a more condition-refined epigenetic response. Genes identified as under adaptive pressure through Fst and nucleotide diversity in the high-altitude population clustered around the differentially expressed an upstream environmental response control gene, HMGB1. The high-altitude population of A. caliginosa indicated adaption and acclimatisation to high-altitude conditions and suggested resilience to extreme weather events. This mechanistic understanding could help offer a strategy in further identifying other species capable of maintaining soil fertility in extreme environments.

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The earthworm Aporrectodea caliginosa stimulates abundance and activity of phenoxyalkanoic acid herbicide degraders.

Project description:2-Methyl-4-chlorophenoxyacetic acid (MCPA) is a widely used phenoxyalkanoic acid (PAA) herbicide. Earthworms represent the dominant macrofauna and enhance microbial activities in many soils. Thus, the effect of the model earthworm Aporrectodea caliginosa (Oligochaeta, Lumbricidae) on microbial MCPA degradation was assessed in soil columns with agricultural soil. MCPA degradation was quicker in soil with earthworms than without earthworms. Quantitative PCR was inhibition-corrected per nucleic acid extract and indicated that copy numbers of tfdA-like and cadA genes (both encoding oxygenases initiating aerobic PAA degradation) in soil with earthworms were up to three and four times higher than without earthworms, respectively. tfdA-like and 16S rRNA gene transcript copy numbers in soil with earthworms were two and six times higher than without earthworms, respectively. Most probable numbers (MPNs) of MCPA degraders approximated 4 × 10(5) g(dw)(-1) in soil before incubation and in soil treated without earthworms, whereas MPNs of earthworm-treated soils were approximately 150 × higher. The aerobic capacity of soil to degrade MCPA was higher in earthworm-treated soils than in earthworm-untreated soils. Burrow walls and 0-5 cm depth bulk soil displayed higher capacities to degrade MCPA than did soil from 5-10 cm depth bulk soil, expression of tfdA-like genes in burrow walls was five times higher than in bulk soil and MCPA degraders were abundant in burrow walls (MPNs of 5 × 10(7) g(dw)(-1)). The collective data indicate that earthworms stimulate abundance and activity of MCPA degraders endogenous to soil by their burrowing activities and might thus be advantageous for enhancing PAA degradation in soil.

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Project description:The take-all disease caused by the soilborne fungus Gaeumannomyces graminis var tritici (Ggt) is one of the most-studied and widespread root diseases worldwide. Here, we investigated the ability of the earthworm Aporrectodea caliginosa to induce take-all disease tolerance in Triticum aestivum. In a greenhouse experiment, plants were grown in a sandy soil. Plants were inoculated or not with Ggt and in the presence or absence of earthworms. There was 4 levels of treatment (plants only, inoculated with Ggt, inoculated with earthworms or inoculated with earthworms and Ggt), and 2-3 plants per treatments.

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