One ordinary day on the meadow: The life of the anthers

Vosolsobě, S. (1), Martinek, J. (1), Elexhauserová, A. (2), Janovský, Z. (3)

1) Dept. of Experimental Plant Biology, Faculty of Science, Charles University in Prague
2) Dept. of Zoology, Faculty of Science, University of South Bohemia, Čes. Budějovice
3) Dept. of Botany, Faculty of Science, Charles University in Prague

Pollen grains transfer from anthers to pistils is the most important step in sexual reproduction of
plants. This process may be very vulnerable because pollen grains cannot be released during
wet weather and in case of entomogamous plant, plans are also limited by insect activity. We
studied four dominant entomogamous plant species (Succisa pratensis, Centaurea jacea,
Achillea ptarmica and Achillea millefolium) and we have been demonstrated that anthers are
extremely short-lived structures active only severals hours, which development is strongly
affected by weather. Anthers budding is circadially regulated process culminating in the
morning. However anthers opening occurred only on sunny weather after drying of dew. In rainy
weather anthers opening can be delayed or stopped. Anthers that can't manage to open during
one day abort. We have been also demonstrated that different plant species have different
strategy for pollen export: - anthers of Succisa pratensis are opening very early and quickly by
dehiscence and about 90% of pollen is exported during first hour. On the other hand, anthers of
plants from family Asteraceae form theca (tube from anthers) and pollen grains are slowly
displaced from theca by growing style. This could be very important apomorphy of Asteraceae
because this allows the extension of male activity of these flowers.

This study was supported by GA ČR, P505/11/1589.

Presentováno na Dnech experimentální biologie rostlin v Praze v září 2011.

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