Acclimation of Romanchella perrieri
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ABSTRACT:
PROVIDER: PRJEB30561 | ENA |
REPOSITORIES: ENA
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Project description:Understanding the molecular basis of plant heat tolerance helps to predict the consequences of climate warming on plant performance, particularly in vulnerable environments. Our current understanding comes primarily from studies in Arabidopsis thaliana (Arabidopsis) and select crops exposed to short and intense periods of heat stress. In this study we sought to characterise the transcriptomic responses of Wahlenbergia ceracea (W. ceracea), an Australian alpine herb, to growth under sustained moderate warming. We compared responses of pre-defined tolerant and sensitive lines, based on measures of photosynthetic thermostability, to growth under cool (24/15 ºC day/night) or warm (30/20 ºC day/night) temperatures to identify the pathways involved in heat tolerance and acclimation. Under warmer growth temperatures, W. ceracea up-regulated genes involved in RNA metabolism, while down-regulating those involved in photosynthesis and pigment metabolism. In tolerant lines, genes related to photosystem II and light-dependent photosynthetic reactions were more strongly down-regulated. This suggests that the regulation of electron transport and its components may be involved in thermal acclimation. Our results also highlight the importance of hormonal gene networks, particularly those responsive to ethylene, during longer-term moderate warming. In conclusion, our results point to post-transcriptional processes and the stabilisation of the electron transport chain as candidate mechanisms for thermal acclimation in heat-tolerant W. ceracea. The study also revealed many temperature-responsive genes with no detectable ortholog in Arabidopsis, whose characterization may enhance our understanding of physiological acclimation and have relevance for the biotechnological improvement of threatened species and crops.
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Project description:We assembled de novo transcriptomes for three Antarctic invertebrate species: the limpet Nacella concinna (foot muscle tissue), the amphipod Paracerodocus miersii (body wall tissue) and the urchin Sterechinus neumayeri (coelomic fluid). Individuals (n = 5 per treatment) were sampled following exposure to different rates of warming: 1°C per hour, 1°C per day, 1°C per 3 days, or after acclimation to 2°C for 3 months. For longer term experiments (1°C per day, 1°C per 3 days and acclimation), control animals were sampled at both the start and end of the experiment to identify possible seasonal effects. For the shorter term experiment (1°C per hour) only one set of controls was needed.
2019-08-31 | E-MTAB-8241 | biostudies-arrayexpress
Project description:Heat waves caused by global warming severely challenge photosynthesis and hence plant biomass production, but the mechanisms of its adjustment, repair and biogenesis during heat acclimation are elusive. We provide a global and time-resolved insight, how these processes are modulated during heat acclimation in chloroplasts, revealing profound modulation of protein biogenesis. Ribosome profiling with Chlamydomonas reinhardtii showed early translational downregulation during synthesis of photosynthesis core antenna proteins, a response that is conserved in Nicotiana tabacum. Our data suggest that these early effects may be caused by reduced translocation of ribosomes synthesizing thylakoid proteins, and that later heat acclimation alleviates these effects. Analysis of the proteinaceous interactome of plastid ribosomes demonstrates widespread remodeling of ribosome-associated processes that could be responsible for the early translational impacts and subsequent acclimation responses. The role of chlorophyll metabolism, protein targeting, and assembly of photosystem complexes as co-translational bottlenecks during heat acclimation are discussed.
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Project description:Background: Ocean temperatures are projected to increase over the coming century, with dramatic consequences for the marine biosphere. Diatoms are important contributors to marine primary production and the ocean carbon cycle, yet the molecular mechanisms that regulate their acclimation and adaptation to temperature are poorly understood. Method: Here we use a transcriptomic approach to identify the molecular mechanisms associated with temperature acclimation and adaptation in closely related colder- and warmer-adapted diatom species. Results: We find contrasting patterns of differential expression at sub- and supra-optimal temperatures across the two species, which may be due to adaptive changes in baseline expression. Frontloaded and divested pathways indicate protein processing machinery, membrane structure, and the balance between temperature-independent photosynthesis and temperature-dependent metabolism are key elements of adaptation to temperature changes. Conclusions: Our findings suggest that transcriptional frontloading and divestment may provide a framework to interpret diatom acclimation and adaptation to temperature and success under future warming.
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Project description:As a result of increasing thermal fluctuations and mean temperature values, organisms will experience conditions beyond their physiological limits. In situ adaptation to thermal regimes is mediated via directional selection and phenotypic plasticity. The latter involves physiological and morphological adjustments realized by underlying molecular mechanisms. Understanding species' adaptive capacities requires investigating these adjustive processes. Yet, acclimation through phenotypic plasticity remains largely unexplored, especially at the molecular level; For example, whether cold-adapted species inhabiting freshwater spring ecosystems have evolved adaptive mechanisms to cope with warming of freshwater habitats has, to our knowledge, never been investigated. This work reports a comprehensive proteomics study of the stenotopic species Crunoecia irrorata (Curtis, 1834) (Trichoptera: Lepistomatidae) acclimated to 10, 15 and 20 °C for 168 h. A liquid chromatography tandem mass spectrometry (LC-MS/MS)-based shotgun proteomics approach identified molecular mechanisms underlying acclimation. We constructed a homology-based database by combining genomic and transcriptomic data from related species and quantified 1356 proteins, of which 186 were differentially expressed between temperature treatments. Through functional annotation, we identified candidate proteins facilitating, among others, trehalose accumulation, tracheal system alteration, and heat shock protein regulation, then discuss concomitant ecophysiological implications. These results provide new insights into the mechanisms of adaptive responses to warming of species inhabiting freshwater ecosystems sensitive to climate change. Further, identified candidate proteins will aid in developing targeted experiments to understand their compensatory physiology. To our knowledge, this is the first study utilizing this approach to investigate the nature of phenotypic plasticity of aquatic macroinvertebrates.
2019-08-08 | PXD014052 | Pride