Ontology highlight
ABSTRACT:
PROVIDER: PRJNA849245 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR19658400.fastq.gz | Fastqsanger.gz | |||
| SRR19658500.fastq.gz | Fastqsanger.gz | |||
| SRR19658401.fastq.gz | Fastqsanger.gz | |||
| SRR19658501.fastq.gz | Fastqsanger.gz | |||
| SRR19658402.fastq.gz | Fastqsanger.gz |
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Project description:Different populations of the same species survive different environments through local adaptation. Temperature is one of the most important driving forces that could result in local adaptation. Here, we studied the influence of extreme low temperature on the survival of two genetically and geographically distinct populations of the free-living Caenorhabditis briggsae. We found that Caenorhabditis briggsae strains of temperate origin had a cold resistant phenotype, while those originating from a tropical climate had reduced survival after cold treatment. Using this phenotypic difference between geographically diverse populations as a model for how species adapt to their local environment, we then analyzed the transcriptional profiles of two Caenorhabditis briggsae strains of tropical and temperate origin to find genes that are involved in survival after extreme cold. In summary, the response to the extreme low temperature that clearly distinguishes the temperate and tropical Caenorhabditis briggsae strains could serve as an excellent example for studying local adaption of species that show genetic separation associated with their geographical distribution.
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Project description:BACKGROUND: Climate change will lead in the future to an occurrence of heat waves with a higher frequency and duration than observed today, which has the potential to cause severe damage to seedlings of temperate maize genotypes. In this study, we aimed to (I) assess phenotypic variation for heat tolerance of temperate European Flint and Dent maize inbred lines, (II) investigate the transcriptomic response of temperate maize to linearly increasing heat levels and, (III) identify genes associated with heat tolerance in a set of genotypes with contrasting heat tolerance behaviour. RESULTS: Strong phenotypic differences with respect to heat tolerance were observed between the examined maize inbred lines on a multi-trait level. We identified 607 heat responsive genes as well as 39 heat tolerance genes. CONCLUSION: Our findings indicate that individual inbred lines developed different genetic mechanisms in response to heat stress. We applied a novel statistical approach enabling the integration of multiple genotypes and stress levels in the analysis of abiotic stress expression studies.
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Project description:<p>Patterns in functional diversity of organisms at large spatial scales can provide insight into possible responses to future climate change, but it remains a challenge to link large-scale patterns at the organismal level to their underlying physiological mechanisms. The climate variability hypothesis predicts that temperate ectotherms will be less vulnerable to climate warming than tropical ectotherms, due to their superior acclimatization capacity. However, metabolic acclimatization occurs over multiple levels of the biological hierarchy, from the enzyme and cellular level, through organ systems, to whole-organism metabolic rate. Previous studies have focused on one or a few biological hierarchy levels, leaving us without a general understanding of how metabolic acclimatization might differ between tropical and temperate species. Here, we investigate thermal acclimatization of 3 species of <em>Takydromus</em> lizards distributed along a broad latitudinal gradient in China, by studying metabolic modifications at the level of the whole organism, organ, mitochondria, metabolome and proteome. As predicted by the climate variability hypothesis, the 2 temperate species <em>T. septentrionalis</em> and <em>T. wolteri</em> had an enhanced acclimation response at the whole organism level compared to the tropical species <em>T. sexlineatus</em>, as measured by respiratory gas exchange rates. However, the mechanisms by which whole organism performance was modified was strikingly different in the 2 temperate species: widespread <em>T. septentrionalis</em> modified organ sizes, while the narrowly distributed <em>T. wolteri</em> relied on mitochondrial, proteomic and metabolomic regulation. We suggest that these 2 mechanisms of thermal acclimatization may represent general strategies used by ectotherms, with distinct ecological costs and benefits. Lacking either of these mechanisms of thermal acclimatization capacity, the tropical species is likely to have increased vulnerability to climate change.</p>
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