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Actin filament organization and polarity in pollen tubes revealed by myosin II subfragment 1 decoration

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Abstract

The actin cytoskeleton plays a crucial role in pollen tube growth. In elongating pollen tubes the organization and arrangement of actin filaments (AFs) differs between the shank and apical region. However, the orientation of AFs in pollen tubes has not yet been successfully demonstrated. In the present work we have used myosin II subfragment 1 (S1) decoration to determine the polarity of AFs in pollen tubes. Electron microscopy studies revealed that in the shank of the tube bundles of AFs exhibit uniform polarity with those close to the cell cortex having their barbed ends oriented towards the tip of the pollen tube while those in the cell center have their barbed ends oriented toward the base of the tube. At the subapex, some AFs are organized in closely packed and longitudinally oriented bundles and some form curved bundles adjacent to the cell membrane. In contrast, few AFs are dispersed with random orientation in the extreme apex of the pollen tube. Our results confirm that the direction of cytoplasmic streaming within pollen tubes is determined by the polarity of AFs in the bundles.

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Fig. 1
Fig. 2

Abbreviations

GFP:

Green fluorescent protein

EGTA:

Ethylene glycol tetraacetic acid

Mes:

Sigma BioUltra buffer

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Acknowledgments

We thank Tatsuhiko Noguchi (Laboratory of Morphogenetic Signaling, Center for Developmental Biology, RIKEN Kobe, Japan) for inspiration to modify the actin S1 decoration technique in plant cells, and Deborah J. Frank (Biology Department, Washington University in St. Louis, US) for critical reading of the manuscript. We also thank Olga Narbutt and Michal Swidzinski for their excellent technical assistance. This project was supported by the Ministry of Science and Higher Education in Poland, grant No. N303 023 32/1034.

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Correspondence to Marta Lenartowska.

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Lenartowska, M., Michalska, A. Actin filament organization and polarity in pollen tubes revealed by myosin II subfragment 1 decoration. Planta 228, 891–896 (2008). https://doi.org/10.1007/s00425-008-0802-5

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