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69 results for “acclimation response”
Transcriptional acclimation and spatial differentiation characterize drought response by the ectomycorrhizal fungus Suillus pungens
<ul> <li>Changing precipitation regimes are a challenge for forest health under future climate scenarios. If belowground symbionts can acclimate to changing moisture regimes it may buffer forest trees from these changes.</li> <li>In this study we exposed the ectomycorrhizal fungus <i>Suillus pungens</i> to acute and chronic drought stress and used RNASeq of both ectomycorrhizal roots and extraradical mycelium to gauge the magnitude of stress, identify key genes involved in drought response, and gauge potential ecosystem consequences of drought.</li> <li>We found that there were major transcriptional differences for <i>S. pungens</i> in ectomycorrhizal roots (28% of genes) and extraradical mycelium (41% of genes) under acute drought stress, but only 0.1-2% of genes were differentially expressed in chronic drought treatments. Up to 56% of differentially expressed genes under acute drought were unique to either roots or mycelium. While a number of implicated genes, such as those encoding for trehalose, have well-known roles in osmotic stress, others, such as fungal hydrophobins and atromentin, have received less study and may also impact other ecosystem functions.</li> <li>These results suggest that functional compartmentalization is key to ectomycorrhizal fungal adaptation to stressful climatic conditions and there is high potential for fungal acclimation to ameliorate future climate stress. </li> </ul>
Growth, stress and acclimation responses to fluctuating temperatures in field and domesticated populations of Manduca sexta
<p>Diurnal fluctuations in temperature are ubiquitous in terrestrial environments, and insects and other ectotherms have evolved to tolerate or acclimate to such fluctuations. Few studies have examined whether ectotherms acclimate to diurnal temperature fluctuations, or how natural and domesticated populations differ in their responses to diurnal fluctuations. We examine how diurnally fluctuating temperatures during development affect growth, acclimation and stress responses for two populations of Manduca sexta: a field population that typically experiences wide variation in mean and fluctuations in temperature, and a laboratory population that has been domesticated in nearly constant temperatures for more than 300 generations. Laboratory experiments showed that diurnal fluctuations throughout larval development reduced pupal mass for the lab but not the field population. The differing effects of diurnal fluctuations were greatest at higher mean temperature (30 °C): here diurnal fluctuations reduced pupal mass and increased pupal development time for the lab population, but had little effect for the field population. We also evaluated how mean and fluctuations in temperature during early larval development affected growth rate during the final larval instar as a function of test temperature. At an intermediate (25 °C) mean temperature, both the lab and field population showed a positive acclimation response to diurnal fluctuations, in which subsequent growth rate was significantly higher at most test temperatures. In contrast at higher mean temperature (30 °C), diurnal fluctuations significantly reduced subsequent growth rate at most test temperatures for the lab population, but not for the field population. These results suggest that during domestication in constant temperatures, the lab population has lost the capacity to tolerate or acclimate to high and fluctuating temperatures. Population differences in acclimation capacity in response to temperature fluctuations has not been previously demonstrated, but they may be important for understanding the evolution of reaction norms and performance curves. </p>
Terrestrial acclimation and exercise lead to bone functional response in Polypterus pectoral fins
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Growth, stress and acclimation responses to fluctuating temperatures in field and domesticated populations of Manduca sexta
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Data from: Stress response or beneficial temperature acclimation: transcriptomic signatures in Antarctic fish (Pachycara brachycephalum)
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Data from: Testing the thermal limits: non-linear reaction norms drive disparate thermal acclimation responses in Drosophila melanogaster
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Data from: Sea urchins in a high-CO2 world: the influence of acclimation on the immune response to ocean warming and acidification
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Transcriptional acclimation and spatial differentiation characterize drought response by the ectomycorrhizal fungus Suillus pungens
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Data from: Host and parasite thermal acclimation responses depend on the stage of infection
1. Global climate change is expected to alter patterns of temperature variability, which could influence species interactions including parasitism. Species interactions can be difficult to predict in variable-temperature environments because of thermal acclimation responses, i.e. physiological changes that allow organisms to adjust to a new temperature following a temperature shift. 2. The goal of this study was to determine how thermal acclimation influences host resistance to infection and to test for parasite acclimation responses, which might differ from host responses in important ways. 3. We tested predictions of three, non-mutually exclusive hypotheses regarding thermal acclimation effects on infection of green frog tadpoles (Lithobates clamitans) by the trematode parasite Ribeiroia ondatrae with fully replicated controlled-temperature experiments. Trematodes or tadpoles were independently acclimated to a range of 'acclimation temperatures' prior to shifting them to new 'performance temperatures' for experimental infections. 4. Trematodes that were acclimated to intermediate temperatures (19–22 °C) had greater encystment success across temperatures than either cold- or warm-acclimated trematodes. However, host acclimation responses varied depending on the stage of infection (encystment vs. clearance): warm- (22–28 °C) and cold-acclimated (13–19 °C) tadpoles had fewer parasites encyst at warm and cold performance temperatures, respectively, whereas intermediate-acclimated tadpoles (19–25 °C) cleared the greatest proportion of parasites in the week following exposure. 5. These results suggest that tadpoles use different immune mechanisms to resist different stages of trematode infection, and that each set of mechanisms has unique responses to temperature variability. Our results highlight the importance of considering thermal responses of both parasites and hosts when predicting disease patterns in variable-temperature environments.
Transcriptional response to long-term thermal acclimation in an ecologically relevant marine cyanobacterium of the ubiquitous Synechococcus clade II
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Fig. 6 in Expression profile of two HSP70 chaperone proteins in response to extreme thermal acclimation in Xestia c-nigrum (Lepidoptera: Noctuidae)
Fig. 6. Xc-HSP70 mRNA expression profiles induced by cold (−7 to 5 °C) and heat (37 to 47 °C) in 2nd, 3rd, 4th, 5th, and 6th instars and pupae of Xestia cnigrum. The relative quantities indicate the levels of the HSP70 gene transcript normalized against transcript levels of β-actin as an internal standard and compared with the transcript levels of the untreated control at 25 °C. An asterisk indicates a significant difference between the control and heat shock conditions (significant, * P <0.05). The data are denoted as the mean ± SEM (error bar).
Data from: Mitochondrial genotype and phenotypic plasticity of gene expression in response to cold acclimation in killifish
Adjustments of aerobic metabolic processes are critical components of organismal responses to environmental change that require tight co-ordination between the nuclear and mitochondrial genomes. Intraspecific differences in mitochondrial genotype can affect gene transcription in both genomes. Thus, variation in mitochondrial genotype may be associated with differences in the plasticity of gene expression when organisms are faced with changes in environmental conditions. Cold acclimation is known to result in metabolic responses involving increases in mitochondrial amount and capacity, suggesting that low temperatures may pose a particular challenge when co-ordinating the functions of the nuclear and mitochondrial genomes. In this study, we utilized RNA-seq to assess transcriptome-wide gene expression in the muscle of Atlantic killifish (Fundulus heteroclitus) from a population that contains segregating variation in mitochondrial genotype. We examined gene expression plasticity in response to 5°C acclimation and the effects of mitochondrial genotype on this plasticity. Cold acclimation resulted in changes in gene expression consistent with up-regulation of genes involved in many cellular functions, including spliceosomal and proteasomal processes, and with down-regulation of genes involved in extracellular matrix, muscle contraction and oxidative phosphorylation functions. There were few differences in gene expression between killifish with different mitochondrial genotypes: 14 genes demonstrated significant interactions between mitochondrial genotype and acclimation temperature and 3 genes demonstrated effects of mitochondrial genotype alone. These results indicate that variation in mitochondrial genotype has modest effects on gene expression; the majority of which are revealed as differences in plasticity as a result of environmental change.
Data for Sentis et al. Short-term thermal acclimation modulates predator functional response
<p>Data from the study Short-term thermal acclimation modulates predator functional response by Arnaud Sentis, Lukas Veselý, Marek Let, Martin Musil, Viktoriia Malinovska and Antonín Kouba. The data represent the number of prey eaten for different initial prey densities, temperatures and acclimation times.</p>
Data from: Host and parasite thermal acclimation responses depend on the stage of infection
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Data for Sentis et al. Short-term thermal acclimation modulates predator functional response
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Data from: Mitochondrial genotype and phenotypic plasticity of gene expression in response to cold acclimation in killifish
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Identification and characterization of a core set of ROS wave-associated transcripts involved in the systemic acquired acclimation response of Arabidopsis to excess light [H2O2]
GEO Series GSE117297. Arabidopsis thaliana. 12 samples. Type: Expression profiling by high throughput sequencing.
Revealing the moleclar mechanisms of temperature acclimation and adaptation in marine diatoms with transcriptional responses to sub- and supra-optimal growth temperatures
GEO Series GSE125205. Chaetoceros sp.. 18 samples. Type: Expression profiling by high throughput sequencing.
Root system responses to low temperature acclimation of Arabidopsis reil ribosome biogenesis double mutants
GEO Series GSE144916. Arabidopsis thaliana. 27 samples. Type: Expression profiling by array.
Endogenous small-noncoding RNAs and their roles in cold response and stress acclimation in Cassava
GEO Series GSE52177. Ricinus communis; Manihot esculenta. 6 samples. Type: Non-coding RNA profiling by high throughput sequencing.
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International Brain Laboratory public data
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OpenNeuro
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