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Distribution of poly(A) RNA and splicing machinery elements in mature Hyacinthus orientalis L. pollen grains and pollen tubes growing in vitro

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Summary.

The localization of poly(A) mRNA and molecules participating in pre-mRNA splicing, i.e., small nuclear ribonucleoproteins (snRNPs) and the SC35 protein, in mature Hyacinthus orientalis L. pollen grains before anthesis and pollen tubes germinating in vitro were analyzed. The observations indicated a pattern of poly(A) mRNA distribution in mature pollen grains before anthesis which differed from that in germinating pollen grains. Directly before anthesis, poly(A) mRNA was homogeneously distributed throughout the whole cytoplasm, whereas after rehydration, it accumulated at one of the pollen poles. In the pollen tube, poly(A) mRNA was present in the cytoplasm, mainly in the areas beneath the cell membrane and the apical zone. Both before anthesis and during growth of the pollen tube, splicing snRNPs and SC35 protein were localized mainly in the area of the pollen nuclei. During anthesis and just after rehydration of the pollen grains, the pattern of labeling and the levels of the investigated antigens in the areas of the vegetative and generative nuclei were similar. During growth of the pollen tube, a change was observed in the distribution and an increase in the levels of trimethylguanosine snRNA and SC35 protein in the vegetative nucleus. Such a pattern of localization of the splicing machinery suggests resumption of transcription and/or maturation of pre-mRNA in the growing pollen tube.

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Authors and Affiliations

  1. Department of Cell Biology, Institute of General and Molecular Biology, Nicolaus Copernicus University, Toruń

    K. Zienkiewicz, D. J. Smoliński & E. Bednarska

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  1. K. Zienkiewicz
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  2. D. J. Smoliński
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  3. E. Bednarska
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Correspondence to K. Zienkiewicz.

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Correspondence and reprints: Department of Cell Biology, Institute of General and Molecular Biology, Nicolaus Copernicus University, Gargarina 9, 87-100 Toruń, Poland.

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Zienkiewicz, K., Smoliński, D. & Bednarska, E. Distribution of poly(A) RNA and splicing machinery elements in mature Hyacinthus orientalis L. pollen grains and pollen tubes growing in vitro. Protoplasma 227, 95–103 (2006). https://doi.org/10.1007/s00709-005-0153-z

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  • DOI: https://doi.org/10.1007/s00709-005-0153-z

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