Abstract
Microgametogenesis in angiosperms results in two structurally and functionally different cells, one generative cell, which subsequently forms the sperm cells, and the vegetative cell. We analysed the chromatin properties of both types of nuclei after first and second pollen mitosis in rye (Secale cereale). The condensed chromatin of generative nuclei is earmarked by an enhanced level of histone H3K4/K9 dimethylation and H3K9 acetylation. The less condensed vegetative nuclei are RNA polymerase II positive. Trimethylation of H3K27 is not involved in transcriptional downregulation of genes located in generative nuclei as H3K27me3 was exclusively detected in the vegetative nuclei. The global level of DNA methylation does not differ between both types of pollen nuclei. In rye, unlike in Arabidopsis thaliana (Ingouff et al. Curr Biol 17:1032–1037 2007; Schoft et al. EMBO Rep 10:1015–1021 2009), centromeric histone H3 is not excluded from the chromatin of the vegetative nucleus and the condensation degree of centromeric and subtelomeric regions did not differ between the generative and vegetative nuclei. Differences between rye and A. thaliana data suggest that the chromatin organization in mature nuclei of pollen grains is not universal across angiosperms.
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Abbreviations
- CENH3:
-
Centromeric histone H3
- ChIP:
-
Chromatin immunoprecipitation
- DAPI:
-
4′,6-diamidino-2-phenylindole
- FISH:
-
Fluorescence in situ hybridization
- H3K4me2:
-
Dimethylated histone H3 at lysine 4
- H3K9me2:
-
Dimethylated histone H3 at lysine 9
- H3K27me3:
-
Trimethylated histone H3 at lysine 27
- H3K9ac:
-
Acetylated histone H3 at lysine 9
- Sup:
-
Supernatant
- Pel:
-
Pellet
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Acknowledgements
The anti-CENH3 antibody was kindly provided by Drs. P. Talbert and S. Henikoff (Howard Hughes Medical Institute, USA). We thank Jochen Kumlehn and Ingo Schubert for helpful suggestions on the manuscript. This work was supported by the Deutsche Forschungsgemeinschaft (HO 1779/10-1 and SFB 648).
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Fig. 1
Distribution of histone H3K4me2 in bicellular pollen of rye. Ten consecutive optical sections are shown. Note the clustering of immunosignals towards the periphery of the nuclear membrane and the exclusion of the nucleolus in the generative nucleus. In ‘merged’, DAPI and immunolabelled pollen are pseudocoloured in blue and in red, respectively. (PSD 6,281 kb; DOC 6,281 kb)
Fig. 2
Distribution of a histone H3K4me2, b histone H3K9me2, c histone H3K9ac, d histone H3K27me3, e RNA polymerase II (RNA pol II) in meristematic root tip cells of rye. In ‘merged’, DAPI and immunolabelled cells are pseudocoloured in blue and in red, respectively. Scale bar represents 10 μm. (PSD 3,963 kb; DOC 3,963 kb)
Fig. 3
Distribution of CENH3 (in yellow) in meristematic metaphase chromosomes of rye. Chromosomes are counterstained in red. Scale bar represents 10 μm. (PSD 1,786 kb; DOC 1,786 kb)
Fig. 4
Distribution of CENH3 (in red) and of α-tubulin (in green) in tricellular pollen of rye. In ‘merged’, DAPI is shown in blue. Scale bar represents 50 μm. (PSD 7,188 kb; DOC 7,188 kb)
Fig. 5
Distribution of the centromere-specific repeat Bilby (in red) and of the subtelomere-specific repeat pSc200 (in green) in a semi-thin section of a rye anther. The insert in ‘merged’ shows part of the further enlarged filament. In ‘merged’, DAPI is shown in blue. Scale bar represents 100 μm. (PSD 7,254 kb; DOC 7,254 kb)
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Houben, A., Kumke, K., Nagaki, K. et al. CENH3 distribution and differential chromatin modifications during pollen development in rye (Secale cereale L.). Chromosome Res 19, 471–480 (2011). https://doi.org/10.1007/s10577-011-9207-6
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DOI: https://doi.org/10.1007/s10577-011-9207-6