Zostera capensis
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ABSTRACT:
PROVIDER: PRJNA1019924 | ENA |
REPOSITORIES: ENA
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Project description:Gene expression of seagrass populations in a common-stress-garden setup
| PRJNA204906 | ENA
Project description:Despite knowledge that seagrass meadows are threatened by multiple global change stressors, significant gaps exist in current knowledge. In particular, little is known about the interactive effects of warming and eutrophication on seagrasses globally, or about responses of African seagrasses to global change, despite these ecosystem engineers providing critical goods and services to local livelihoods. Here, we report on laboratory experiment assessing the main and joint effects of warming and nutrient enrichment on Cape eelgrass (Zostera capensis) from the West coast of South Africa, in which morphological attributes, photosynthetic efficiency and elemental content were assessed. Results indicate that shoot density, leaf length, aboveground biomass and effective quantum yield were negatively impacted by both warming and nutrient enrichment. Growth rate, leaf density and leaf width decreased with increasing nutrient levels but not temperature. In addition, epiphytic fouling on seagrass leaves were enhanced by both warming and nutrient enrichment but with warming eliciting a greater response. Collectively, our findings indicate a stronger effect of enrichment on Z. capensis performance relative to warming, suggesting that the upper levels of coastal eutrophication upon which our experiment was based is likely a stronger stressor than warming. Our findings also highlight limited interaction between warming and nutrient enrichment on Z. capensis performance, suggesting that effects of these stressors are likely to be propagated individually and not interactively. Our findings raise awareness of susceptibility of Z. capensis to eutrophication and the need to manage nutrient inputs into coastal ecosystems to preserve meadows of this seagrass and the critical ecosystem functions they provide.
| S-EPMC6459588 | biostudies-literature
Project description:Here, we investigate the genetic mechanisms that underlie thermal specialization of closely-related vibrios isolated from coastal water at the Beaufort Inlet (Beaufort, NC, USA). This location experiences large seasonal temperature fluctuations (annual range of ~20°C), and a clear seasonal shift in vibrio diversity has been observed (Yung et al. 2015). This previous study suggested that the mechanisms of thermal adaptation apparently differ based on evolutionary timescale: shifts in the temperature of maximal growth occur between deeply branching clades but the shape of the thermal performance curve changes on shorter time scales (Yung et al. 2015). The observed thermal specialization in vibrio populations over relatively short evolutionary time scales indicates that few genes or cellular processes may contribute to the differences in thermal performance between populations. In order to understand the molecular mechanisms that underlie adaptation to local thermal regimes in environmental vibrio populations, we employ genomic and transcriptomic approaches to examine transcriptomic changes that occur within strains grown at their thermal optima and under heat and cold stress. Moreover, we compare two closely-related strains with different laboratory thermal preferences to identify in situ evolutionary responses to different thermal environments in genome content and alleles as well as gene expression.
2018-07-31 | GSE83396 | GEO
Project description:Background: Geographic variation in the thermal environment impacts a broad range of biochemical and physiological processes and can be a major selective force leading to local population adaptation. In the intertidal copepod Tigriopus californicus, populations along the coast of California show differences in thermal tolerance that are consistent with adaptation, i.e., southern populations withstand thermal stresses that are lethal to northern populations. To understand the genetic basis of these physiological differences, we use an RNA-seq approach to compare genome-wide patterns of gene expression in two populations known to differ in thermal tolerance. Results: Observed differences in gene expression between the southern (San Diego) and the northern (Santa Cruz) populations included both the number of affected loci as well as the identity of these loci. However, the most pronounced differences concerned the amplitude of up-regulation of genes producing heat shock proteins (Hsps) and genes involved in ubiquitination and proteolysis. Cuticle genes were up-regulated in SD but down-regulated in SC, and mitochondrial genes were downregulated in both populations. Among the hsp genes, orthologous pairs show markedly different thermal responses as the amplitude of hsp response was greatly elevated in the San Diego population, most notably in members of the hsp70 gene family. There was no evidence of accelerated evolution at the sequence level for hsp genes. Conclusions: Marked changes in gene expression were observed in response to acute sublethal thermal stress in the copepod T. californicus. Although some qualitative differences were observed between populations (e.g., cuticle gene regulation), the most pronounced differences involved the magnitude of induction of numerous hsp and ubiquitin genes. These differences in gene expression suggest that evolutionary divergence in the regulatory pathway(s) involved in acute temperature stress may offer at least a partial explanation of latitudinal trends in thermal tolerance observed in Tigriopus.
2012-09-11 | GSE38546 | GEO
Project description:Transcriptomic resilience to global warming in the seagrass Zostera marina, a marine foundation species
| PRJNA80089 | ENA
Project description:Transcriptomic response of bovine oviductal organoids to thermal stress.
| PRJNA916865 | ENA
Project description:Southern California (USA) populations of the intertidal marine snail Chlorostoma (formerly Tegula) funebralis are generally exposed to higher air and water temperatures than northern California populations. Previous studies have shown that southern populations are more tolerant of heat stress than northern populations. To assess the potential role of gene regulation in these regional differences, we examined transcriptome responses to thermal stress in two southern and two northern populations of C. funebralis. Snails from the four populations were acclimated to a common lab environment, exposed to a heat stress representative of natural low tide conditions, and then analyzed using RNA-Seq to characterize changes in gene expression associated with stress and differences in expression across geographic regions. Changes in expression following stress were dominated by genes involved in apoptosis, the inflammatory response, response to mis and unfolded proteins, and ubiquitination of proteins. Heat shock proteins (Hsps) were up-regulated in both northern and southern populations. However, while the magnitude of the response was significantly greater in northern populations for the majority of Hsp70s, the southern populations showed a greater up-regulation for roughly half of the Hsp40s, which are co-chaperones for Hsp70s. Differential expression analysis of the control versus treatment genes in the northern and southern populations respectively revealed that 56 genes, many involved in the inflammation and immune response, responded to heat stress only in the northern populations. Moreover, several of the molecular chaperones and antioxidant genes that were not differentially expressed in the southern populations instead showed higher constitutive expression under control conditions compared to the northern populations. The expression levels of some of these constitutive genes such as superoxide dismutase were also found to positively correlate with survival following heat stress. This suggests that expression of these genes has evolved a degree of M-bM-^@M-^\frontloadingM-bM-^@M-^] that may contribute to the higher thermal tolerance of southern populations. mRNA profiles of northern and southern California heat-stressed and control C. funebralis were generated by 100bp paired end sequencing, in duplicate, using Illumina HiSeq2000.
2014-08-20 | E-GEOD-57142 | biostudies-arrayexpress
Project description:Southern California (USA) populations of the intertidal marine snail Chlorostoma (formerly Tegula) funebralis are generally exposed to higher air and water temperatures than northern California populations. Previous studies have shown that southern populations are more tolerant of heat stress than northern populations. To assess the potential role of gene regulation in these regional differences, we examined transcriptome responses to thermal stress in two southern and two northern populations of C. funebralis. Snails from the four populations were acclimated to a common lab environment, exposed to a heat stress representative of natural low tide conditions, and then analyzed using RNA-Seq to characterize changes in gene expression associated with stress and differences in expression across geographic regions. Changes in expression following stress were dominated by genes involved in apoptosis, the inflammatory response, response to mis and unfolded proteins, and ubiquitination of proteins. Heat shock proteins (Hsps) were up-regulated in both northern and southern populations. However, while the magnitude of the response was significantly greater in northern populations for the majority of Hsp70s, the southern populations showed a greater up-regulation for roughly half of the Hsp40s, which are co-chaperones for Hsp70s. Differential expression analysis of the control versus treatment genes in the northern and southern populations respectively revealed that 56 genes, many involved in the inflammation and immune response, responded to heat stress only in the northern populations. Moreover, several of the molecular chaperones and antioxidant genes that were not differentially expressed in the southern populations instead showed higher constitutive expression under control conditions compared to the northern populations. The expression levels of some of these constitutive genes such as superoxide dismutase were also found to positively correlate with survival following heat stress. This suggests that expression of these genes has evolved a degree of “frontloading” that may contribute to the higher thermal tolerance of southern populations.
2014-08-20 | GSE57142 | GEO
Project description:Red fruits are valued for their vitamin C and polyphenol content, but traditional heat preservation methods used in juice and nectar production can significantly reduce these components. Therefore, alternative non-thermal methods are explored to inactivate foodborne pathogens like Escherichia coli while maintaining the nutritional value. However, knowledge about the effects of these technologies on bacterial cells is limited. This study analyzed differentially expressed genes of E. coli ATCC 8739 inoculated in strawberry nectar after exposure to three treatments with two sets of parameters each, namely thermal treatment, high-pressure processing (HPP), and moderate-intensity pulsed electric field (MIPEF). The highest inactivation efficiency was achieved with HPP at 400 MPa, 1 min, reducing microbial counts by 5.0±0.3 log cfu/mL, and thermal treatment at 60°C, 200 s, achieving a reduction of 4.4±0.2 log cfu/mL, while no inactivation was observed with MIPEF at 6 kV/cm. Transcriptomic analysis showed that thermal and HPP treatments caused similar molecular stress responses in E. coli. In both cases, the most overexpressed genes encoded outer membrane proteins, which may lead to the activation of the envelope stress response. Despite no microbial inactivation was revealed after MIPEF treatment, strong transcriptomic responses were observed, particularly in genes related to membrane integrity and metabolic activity. Numerous overexpressed genes associated with ABC transporters, outer membrane proteins, and lipoproteins were identified, which could increase the strain’s virulence. This study provides insights into the stress response mechanisms induced by conventional and novel treatments. Nevertheless, further research is needed to investigate the long-term effects on bacterial populations.
2024-12-03 | GSE283248 | GEO