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Title: Zur Keimungsbiologie von zehn ausgewählten xerothermen Grasarten
Author(s): Partzsch, Monika
Issue Date: 2010
Type: Article
Language: English
Publisher: Hercynia - Ökologie und Umwelt in Mitteleuropa
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 thediversity of germination strategies among plants is wide. Dry and semi-dry grasslands are characterisedby the dominant occurrence of species from the Poaceae family. In order to determine the germinationsuccess 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 townHalle 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 differenttemperature-light regimes (8/4 °C, 20/10 °C, 32/20 °C; 12 h light : 12 h darkness; 45 days). After thefirst germination experiment, the remaining diaspores were buried in soil, to ensure hibernation until thenext 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, meaningthat, even under favourable conditions, only a proportion of seeds germinates in a certain time. Suchwas the case in particular for Brachypodium pinnatum, Bromus erectus, Danthonia decumbens, Festucabrevipila, F. glaucina, Poa angustifolia and Sesleria albicans. The optimal germination temperaturefor most species was 20/10 °C (light/dark). An increase in temperature induced a higher germinationpercentage and velocity in Agrostis vinealis, Bromus erectus and Poa angustifolia. With the exception ofPoa 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 threediaspore 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) thelong-term persistent type: Brachypodium pinnatum, Bromus erectus, Danthonia decumbens.Key words: germination, dormancy, natural stratification, seed bank type, viability
Annotations: Die Hercynia publiziert Originalbeiträge mit dem Schwerpunkt Ökologie (mit ihren vielseitigen Aspekten der Biodiversität), Botanik, Zoologie, Geologie und Geografie, den anwendungsorientierten Bereichen des Natur- und Umweltschutzes, sowie der Land- und Forstwirtschaft.
ISSN: 2195-531X
Open Access: Open access publication
License: (CC BY-ND 4.0) Creative Commons Attribution NoDerivatives 4.0(CC BY-ND 4.0) Creative Commons Attribution NoDerivatives 4.0
Journal Title: Hercynia - Ökologie und Umwelt in Mitteleuropa
Volume: 43
Issue: 2
Original Publication:
Page Start: 299
Page End: 317(318)
Appears in Collections:Open Journal System ULB

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