Pollen
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA548419 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR10678900_1.fastq.gz | Fastqsanger.gz | |||
| SRR10678900_2.fastq.gz | Fastqsanger.gz | |||
| SRR10678901_1.fastq.gz | Fastqsanger.gz | |||
| SRR10678901_2.fastq.gz | Fastqsanger.gz | |||
| SRR10678902_1.fastq.gz | Fastqsanger.gz |
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Project description:Small RNA diversity and function has been widely characterized in various tissues of the sporophytic generation of the angiosperm model Arabidopsis thaliana. In contrast, there is limited knowledge about small RNA diversity and their roles in developing male gametophytes. We thus carried out small RNA sequencing on RNA isolated from four stages of developing Arabidopsis thaliana pollen. Spores from 4 stages of pollen development (UNM: Uninucleate microspore M-bM-^@M-^S BCP: Bicellular pollen M-bM-^@M-^S TCP: Tricellular pollen M-bM-^@M-^S MP: Mature pollen) were isolated using a percoll gradient-based method (Honys and Twell, 2004) and the small RNA fraction for each sample was isolated and sequenced by Illumina technology. Reference: Honys, D. and Twell, D. (2004) Transcriptome analysis of haploid male gametophyte development in Arabidopsis. Genome Biol. 5/11/R85.
2014-07-01 | E-GEOD-34190 | biostudies-arrayexpress
Project description:Small RNA diversity and function has been widely characterized in various tissues of the sporophytic generation of the angiosperm model Arabidopsis thaliana. In contrast, there is limited knowledge about small RNA diversity and their roles in developing male gametophytes. We thus carried out small RNA sequencing on RNA isolated from four stages of developing Arabidopsis thaliana pollen.
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Project description:DNA metabarcoding of airborne pollen samples
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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.
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Project description:Pollen development from the microspore involves a series of coordinated cellular events, and the resultant mature pollen is specialized in function that it can quickly germinate and produces a polar-growth pollen tube derived from the vegetative cell to deliver two sperms for fertilization. Understanding the molecular program underlying pollen development and germination still remains a major challenge for plant biology. We used Affymetrix GeneChip Rice Genome Array to comprehensively analyzed the dynamic changes in the transcriptomes of rice pollen at five sequential developmental stages from microspores to germinated pollen. Among the 51,279 transcripts on the array, we found 25,062 pollen-preferential transcripts, among which 2,203 were development stage-enriched. The diversity of transcripts decreased greatly from microspores to mature and germinated pollen, whereas the number of stage-enriched transcripts displayed a U-type change, with the lowest at the bicellular pollen stage; and a transition of overrepresented stage-enriched transcript groups associated with different functional categories, which indicates a shift in gene expression program at the bicellular pollen stage. About 54% of the now-annotated rice F-box protein genes were expressed preferentially in pollen. The transcriptome profile of germinated pollen was significantly and positively correlated with that of mature pollen. Analysis of expression profiles and coexpressed features of the pollen-preferential transcripts related to cell cycle, transcription, the ubiquitin/26S proteasome system, phytohormone signalling, the kinase system and defense/stress response revealed five expression patterns, which are compatible with changes in major cellular events during pollen development and germination. A comparison of pollen transcriptomes between rice and Arabidopsis revealed that 56.6% of the rice pollen preferential genes had homologs in Arabidopsis genome, but 63.4% of these homologs were expressed, with a small proportion being expressed preferentially, in Arabidopsis pollen. Rice and Arabidopsis pollen had non-conservative transcription factors each. These results supply novel insights into the molecular program and key components of the regulatory network regulating pollen development and germination. KEYWORDS: rice (Oryza sativa L.), pollination and fertilization, stigma, molecular functions, signaling, microarray, stress response
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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.
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