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• W2339456850 abstract "Partzsch, M.: Germination biology of ten xerothermic grass species – Hercynia N. F. 43 (2010): 299 –317. The germination process generally determines the chance of survival of any plant species; and the diversity of germination strategies among plants is wide. Dry and semi-dry grasslands are characterised by the dominant occurrence of species from the Poaceae family. In order to determine the germination success in different Poaceae taxa, seeds from ten species were collected in the vicinity of Halle (Saale): Agrostis capillaris, A. vinealis, Brachypodium pinnatum, Bromus erectus, Danthonia decumbens, Festuca brevipila, F. glaucina, F. rupicola, Poa angustifolia and Sesleria varia. The region of the town Halle is located in Central Germany (Saxony-Anhalt) and characterised by climatic dryness. In order to identify optimal germination conditions, experiments were carried out under three different temperature-light regimes (8/4 °C, 20/10 °C, 32/20 °C; 12 h light : 12 h darkness; 45 days). After the first germination experiment, the remaining diaspores were buried in soil, to ensure hibernation until the next experimental phase in following spring. Seed viability was tested before and after the experiments. Results indicate that the species are generally characterised by an asynchronistic germination, meaning that, even under favourable conditions, only a proportion of seeds germinates in a certain time. Such was the case in particular for Brachypodium pinnatum, Bromus erectus, Danthonia decumbens, Festuca brevipila, F. glaucina, Poa angustifolia and Sesleria albicans. The optimal germination temperature for most species was 20/10 °C (light/dark). An increase in temperature induced a higher germination percentage and velocity in Agrostis vinealis, Bromus erectus and Poa angustifolia. With the exception of Poa angustifolia, the natural cold stratification (over-wintering) did not lead to an enhanced germination. Results regarding the germination behaviour and seed viability allow to range Poaceae species in three diaspore bank types: (1) the more transient type: Agrostis capillaris, A. vinealis, Festuca rupicola; (2) the short-term persistent type: Festuca brevipila, F. glaucina, Poa angustifolia, Sesleria albicans; (3) the long-term persistent type: Brachypodium pinnatum, Bromus erectus, Danthonia decumbens. Key words: germination, dormancy, natural stratification, seed bank type, viability" @default.
• W2339456850 created "2016-06-24" @default.
• W2339456850 creator A5026464606 @default.
• W2339456850 date "2010-01-01" @default.
• W2339456850 modified "2023-09-23" @default.
• W2339456850 title "Zur Keimungsbiologie von zehn ausgewählten xerothermen Grasarten" @default.
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