Zur Keimungsbiologie von zwölf ausgewählten Xerothermrasen-, Saumund Waldarten - Teil 6: Lamiaceae

Monika Partzsch

Abstract


Partzsch, M.: Germination biology of twelve xerothermic grassland, fringe and wood species - Part 6: Lamiaceae. - Hercynia N. F. 49 (2016): 27 – 45.
Germination is an important functional trait which might explain structure and dynamic of plant communities, but there is still lack of comparable data. Therefore, with the present study the series on investigation of germination behavior under standardized conditions should be proceeding. Seed germination of the following twelve species of the family Lamiaceae was studied: Acinos arvensis, Ajuga reptans, Betonica officinalis, Clinopodium vulgare, Galeopsis tetrahit, Origanum vulgare, Prunella vulgare, Salvia nemorosa, S. pratensis, Teucrium botrys, T. chamaedrys and Thymus serpyllum. The germination experiments were carried out under three temperature-light regimes (8 / 4 °C, 20 / 10 °C, 32 / 20 °C; 12 h light : 12 h darkness; 45 days), simulating climate conditions in spring, summer and autumn. The collected seeds were divided into two parts. Germination experiment of half of the seeds was carried out in the year of harvest. The other half was buried in soil from November till March,
to ensure hibernation until the next experimental phase in following spring. Seed viability was tested before and after the experiments.
The results show that germination percentages of six of the species (Betonica officinalis, Clinopodium vulgare, Origanum vulgare, Prunella vulgaris, Salvia nemorosa, Teucrium botrys) were >50 %, whereas
seeds of the others (Acinos arvensis, Ajuga reptans, Galeopsis tetrahit, Salvia pratensis, Teucrium chamaedrys, Thymus serpyllum) germinated badly. Clinopodium vulgare and Salvia nemorosa showed a significant optimum of germination under warm conditions, and Prunella vulgaris and Thymus serpyllum under hot conditions, whereas the other species germinated in a broad range of temperature between warm und hot conditions. There was almost no germination under cold conditions. Germination was promoted after hibernation only in the therophytes Galeopsis tetrahit and Teucrium botrys (cold germinators). Most species were characterized by an asynchronous germination (expect from Origanum vulgare and Teucrium botrys), where only part of the seeds germinate. The test of seed viability following the experiment showed that non-germinating seeds are still viable. Their germination behavior and
literature references indicate that the investigated diaspores of the Lamiaceae possess physiological and physical dormancy and build up a longterm-persistent diaspore bank in the soil.
Key words: dormancy, life form, natural cold stratification, seed bank type, seed viability

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Martin-Luther-Universität Halle-Wittenberg | HERCYNIA - Ökologie und Umwelt in Mitteleleuropa

P-ISSN 0018-0637, E-ISSN 2195-531X


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