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ABSTRACT: Fungal community under salt-amended treatment in salt marshes

PROVIDER: PRJNA779224 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR16897528_1.fastq.gz	Fastqsanger.gz
	SRR16897528_2.fastq.gz	Fastqsanger.gz
	SRR16897529_1.fastq.gz	Fastqsanger.gz
	SRR16897529_2.fastq.gz	Fastqsanger.gz
	SRR16897530_1.fastq.gz	Fastqsanger.gz

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Community composition of nitrous oxide related genes and their relationship to nitrogen cycling rates in salt marsh sediments

Project description:Salt marshes provide many key ecosystem services that have tremendous ecological and economic value. One critical service is the removal of fixed nitrogen from coastal waters, which limits the negative effects of eutrophication resulting from increased nutrient supply. Nutrient enrichment of salt marsh sediments results in higher rates of nitrogen cycling and, commonly, a concurrent increase in the flux of nitrous oxide, an important greenhouse gas. Little is known, however, regarding controls on the microbial communities that contribute to nitrous oxide fluxes in marsh sediments. To address this disconnect, we generated microbial community profiles as well as directly assayed nitrogen cycling genes that encode the enzymes responsible for overall nitrous oxide flux from salt marsh sediments. We hypothesized that communities of microbes responsible for nitrogen transformations will be structured by nitrogen availability. Taxa that respond positively to high nitrogen inputs may be responsible for the elevated rates of nitrogen cycling processes measured in fertilized sediments. Our data show that, with the exception of ammonia-oxidizing archaea, the community composition of organisms responsible for production and consumption of nitrous oxide was altered under nutrient enrichment. These results suggest that elevated rates of nitrous oxide production and consumption are the result of changes in community structure, not simply changes in microbial activity.

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Project description:Numerous Trichoderma strains are beneficial for plants, promote their growth and confer stress tolerance. A recently described novel Trichoderma strain strongly promotes growth of Arabidopsis thaliana seedlings on media with 50 mM NaCl, while 150 mM NaCl strongly stimulated root colonization and induced salt-stress tolerance in the host without growth promotion. To understand the dynamics of plant-fungus interaction, we examined the secretome from both sides, and revealed a substantial change under different salt regimes, and during co-cultivation. Stress-related proteins, such as fungal Kp4-, WSC- and CFEM-domain-containing proteins, the plant calreticulin and cell-wall modifying enzymes, disappear when the two symbionts are co-cultured under high salt concentrations. More proteins involved in plant and fungal cell wall modifications and the battle of root colonization are found in the co-cultures under salt stress, while the number of plant antioxidant proteins decreased. We identified symbiosis- and salt concentration-specific proteins for both partners. The Arabidopsis PYK10 and a fungal prenylcysteine lyase are only found in the co-culture which promoted plant growth. The comparative analysis of the secretomes suggests that both partners profit from the interaction under salt stress but have to invest more in balancing the symbiosis. We discuss the role of the identified stage- and symbiosis-specific fungal and plant proteins for salt-stress and conditions promoting root colonization and plant growth.

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