Similar Datasets
Project description:Transcriptome analysis of ATG-silenced pollen
| PRJNA667028 | ENA
Project description:Plant reproduction is one key biological process very sensitive to heat stress and, as a consequence, enhanced global warming imposes serious threats to sustain food safety worldwide. In this work we have focused on the molecular impact that high temperature conditions impose on gene expression of Arabidopsis pollen germinated in vitro. We have used a high-resolution ribosome profiling technology to provide, for the first time, a comprehensive study of how both the transcriptome and the translatome of germinated pollen respond to the increase in temperature. Although heat shock responses operate properly under high temperature conditions, we have uncovered important alterations under elevated temperature regimes down-regulating essential processes linked to cation/proton exchange and to carbohydrate/cation symport transport. These alterations provide molecular explanations to the dramatic alterations of pollen tube growth under heat stress. Overall a high correlation between transcriptional and translational responses to high temperature was found, but specific regulations at the translational level are also present in pollen subjected to temperature challenging conditions.
2020-12-15 | GSE145795 | GEO
Project description:Human BEAS-2B were exposed to whole birch pollen using a Pollen Sedimentation Chamber. The chamber was designed to be able to dose cells to dry whole pollen. The goal was to understand the reaction of human epithelial cells to a human real life pollen exposure.
2021-11-03 | GSE179942 | GEO
Project description:Pollen development is central for plant reproduction and is assisted by changes of the transcriptome and the proteome. At the same time, pollen is largely heat sensitive, particularly at early developmental stages. To define the changes during development and the response of different stages to elevated temperatures we investigated the transcriptome and proteome of pollen at tetrad, post-meiotic and mature stage before and after application of elevated temperatures. We used Solanum lycopersicum as an economically important crop. We demonstrate that the number of transcripts declines from tetrad to mature stage, while the protein content shows the opposite trend. Comparison of the transcriptome and proteome led to the discovery of two translational modes assigned as direct translation – transcripts increased in a specific pollen stage lead to increased translation in the same stage – and delayed translation – transcripts are produced for translation in later stages. The response to elevated temperatures is with ~5% of all genes being upregulated comparable to general plant behavior. The alteration at proteome level marked the mature pollen as least responsive and the post-meiotic stages as most responsive with altered levels of 40% of the identified proteins. For a subset of the genes with direct translation we observed a downregulation of protein levels after heat stress, whereas some of the genes with delayed translation showed a shift from delayed to direct translation when heat stress is applied. Further, Hsps, proteasome subunits, ribosomal proteins as well as eukaryotic initiation factors are the most drastically affected groups. On the example of Hsps we document that the response at transcriptome and proteome levels in e.g. the post-meiotic and mature stage does not correlate. Moreover, while all stages respond to heat stress with regulation of transcript abundance of Hsps in a comparable manner, changes at proteome level are distinct. Thus, we demonstrate that the difference in heat stress response in different stages of pollen development is rather manifested by significant changes of protein than transcript abundance.
2015-05-15 | PXD008762 | Pride
Project description:We isolated tricellular pollen (TCP) and pollen mother cells (PMC) of rice using laser microdissection, and did microarray analysis with Agilent 44k rice array.
2010-07-31 | GSE17098 | GEO
Project description:We studied the molecular mechanisms underlying the impact of pollen nutrients on honey bee (Apis mellifera) health and how those nutrients improve resistance to parasites. Using digital gene expression, we determined the changes in gene expression induced by pollen intake in worker bees parasitized or not by the mites Varroa destructor, known for suppressing immunity and decreasing lifespan of bees. bees with or without verroa, and fed or not fed pollen
2011-11-06 | E-GEOD-25161 | biostudies-arrayexpress
Project description:Pollen development is central for plant reproduction and is assisted by changes of the transcriptome and the proteome. At the same time, pollen is largely heat sensitive, particularly at early developmental stages. To define the changes during development and the response of different stages to elevated temperatures we investigated the transcriptome and proteome of pollen at tetrad, post-meiotic and mature stage before and after application of elevated temperatures. We used Solanum lycopersicum as an economically important crop. We demonstrate that the number of transcripts declines from tetrad to mature stage, while the protein content shows the opposite trend. Comparison of the transcriptome and proteome led to the discovery of two translational modes assigned as direct translation – transcripts increased in a specific pollen stage lead to increased translation in the same stage – and delayed translation – transcripts are produced for translation in later stages. The response to elevated temperatures is with ~5% of all genes being upregulated comparable to general plant behavior. The alteration at proteome level marked the mature pollen as least responsive and the post-meiotic stages as most responsive with altered levels of 40% of the identified proteins. For a subset of the genes with direct translation we observed a downregulation of protein levels after heat stress, whereas some of the genes with delayed translation showed a shift from delayed to direct translation when heat stress is applied. Further, Hsps, proteasome subunits, ribosomal proteins as well as eukaryotic initiation factors are the most drastically affected groups. On the example of Hsps we document that the response at transcriptome and proteome levels in e.g. the post-meiotic and mature stage does not correlate. Moreover, while all stages respond to heat stress with regulation of transcript abundance of Hsps in a comparable manner, changes at proteome level are distinct. Thus, we demonstrate that the difference in heat stress response in different stages of pollen development is rather manifested by significant changes of protein than transcript abundance. ------------------------------------------------------- Solanaceae Pollen Thermotolerance Initial Training Network (SPOT-ITN) Consortium
2018-05-15 | GSE109672 | GEO
Project description:We studied the molecular mechanisms underlying the impact of pollen nutrients on honey bee (Apis mellifera) health and how those nutrients improve resistance to parasites. Using digital gene expression, we determined the changes in gene expression induced by pollen intake in worker bees parasitized or not by the mites Varroa destructor, known for suppressing immunity and decreasing lifespan of bees.
2011-11-06 | GSE25161 | GEO
Project description:Pollen tubes extend through pistil tissues and are guided to ovules where they release sperm for fertilization. Although pollen tubes can germinate and elongate in a synthetic medium, their trajectory is random and their growth rates are slower compared to growth in pistil tissues. Furthermore, interaction with the pistil renders pollen tubes competent to respond to guidance cues secreted by specialized cells within the ovule. The molecular basis for this potentiation of the pollen tube by the pistil remains uncharacterized. We used a surgical procedure to obtain large quantities of uncontaminated pollen tubes that grew through the pistil and defined their transcriptome by microarray analysis. We also characterized the transcriptome of in vitro-grown pollen tubes (for 0.5hours or 4hours) and dessicated mature pollen in Arabidopsis.
2009-07-28 | GSE17343 | GEO
Project description:Pollen germination, along with pollen tube growth, is an essential process for the reproduction of flowering plants. The germinating pollen with tip-growth characteristics provides an ideal model system for the study of cell growth and morphogenesis. As an essential step towards a detailed understanding of this important process, the objective of this study was to comprehensively analyze the transcriptome changes during pollen germination and pollen tube growth. Using Affymetrix Arabidopsis ATH1 Genome Arrays, this study is the first to show the changes in the transcriptome from desiccated mature pollen grains to hydrated pollen grains and then to pollen tubes of Arabidopsis thaliana. The number of expressed genes, either for total expressed genes or for specifically expressed genes, increased significantly from desiccated mature pollen to hydrated pollen and again to growing pollen tubes, which is consistent with the finding that pollen germination and tube growth was significantly inhibited in vitro by a transcriptional inhibitor. The results of GO analyses showed that expression of genes related to cell rescue, transcription, signal transduction and cellular transport were significantly changed, especially for up-regulation, during pollen germination and tube growth, respectively. In particular, genes of the CaM/CML, CHX and Hsp families showed the most significant changes during pollen germination and tube growth. These results demonstrate that the overall transcription of genes, both in the number of expressed genes and in the levels of transcription, was increased. Furthermore, the appearance of many novel transcripts during pollen germination as well as tube growth indicates that these newly expressed genes may function in this complex process.
2008-09-08 | GSE6696 | GEO