Zur Keimungsbiologie acht ausgewählter ephemerer Xerothermrasenarten [article]

Monika Partzsch, Universitäts- Und Landesbibliothek Sachsen-Anhalt, Martin-Luther Universität
2022
Partzsch, M.: Germination biology of eight selected ephemeral xerothermic grassland species. – Hercynia N.F. 42 (2009): 93–110.The germination behaviour of plants is strongly related to the environmental conditions and the biology and life span of the species involved. In the natural-near xerothermic vegetation of the porphyry landscape around Halle, Germany (Saxony-Anhalt), we can find plant species with a very narrow seasonal dynamic. These are ephemeral plants which are annual and survive
more » ... g time of the year as seeds in the soil. They can germinate in very early spring or in summer. Other species germinate in autumn und overcome winter as seedlings or juvenile individuals. Both types can be also in combination. For this study our goal was to find out whether the different types of therophytes are characterized by the same germination pattern, or if they show differences depending on their life types. For the consequent comparative studies on germination temperature, percentage germination, velocity, dormancy and viability we selected the following eight species: Cerastium semidecandrum, Erophila verna, Gypsophila muralis, Myosotis ramosissima, M. stricta, Saxifraga tridactylites, Spergula morisonii and Veronica verna.The germination experiments were carried out under varying light-dark-regimes (12/12 hrs at 8/4 °C, 20/10 °C, and 32/20 °C). The first experiment was started ca. 6 weeks after harvest. The rest of the seeds was burrowed under field conditions outdoors and exposed to a natural stratification. The second germination experiment was initiated after hibernation in the following spring. The viability of seeds was tested before and after the 1st and 2nd round of experiments. Results show that there was no complete dormancy in any of the species; a certain proportion of seeds always germinated under all conditions. For C. semidecandrum, E. verna, G. muralis, S. tridactylites and S. morisonii germination percentage and velocity was lowest in the fruiting year while after hibernation it was significantly [...]
doi:10.25673/93390 fatcat:wr52azk2rvekjdgkm5mq5hcb5i