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Seasonal pattern of germination and seed longevity in the invasive species Heracleum mantegazzianum
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SYSNO ASEP 0053218 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Seasonal pattern of germination and seed longevity in the invasive species Heracleum mantegazzianum Title Sezónní průběh klíčení a životnost semen u invazního druhu Heracleum mantegazzianum Author(s) Moravcová, Lenka (BU-J) RID, ORCID
Pyšek, Petr (BU-J) RID, ORCID
Pergl, Jan (BU-J) RID, ORCID
Perglová, Irena (BU-J) RID
Jarošík, Vojtěch (BU-J)Source Title Preslia. - : Česká botanická společnost - ISSN 0032-7786
Roč. 78, - (2006), s. 287-301Number of pages 15 s. Language eng - English Country CZ - Czech Republic Keywords plant invasions ; germination ; seed bank Subject RIV EF - Botanics R&D Projects GA206/05/0323 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z60050516 - BU-J (2005-2011) Annotation We investigated the effects of different temperature regimes and dry storage on germination of H. mantegazzianum (Apiaceae, native to Caucasus) seeds in the laboratory and linked the results with studies of seasonal seed bank depletion in a common garden experiment and under field conditions. Seeds were collected at seven sites in the Slavkovský les region, Czech Republic, cold-stratified for 2 months and germinated at seven temperature regimes. Under all temperature regimes, fresh seeds germinated to significantly higher percentages than older (1, 2, 3 years) seeds. For all storage lengths, seeds germinated best at alternating day/night temperatures of 20/5 °C. The length of the germination period had a significant effect only at low constant temperatures of 2 and 6 °C, where germination percentage increased between 2 and 6 months. Seasonal germination exhibited a distinct pattern, with rapid depletion of seed bank until the first spring after seed burial. Non-dormant seeds were present in the soil early in spring and late in autumn. The higher summer temperatures prevented dormancy breaking and another cold period of at least two months below 10 °C was needed to bring non-germinated seeds out of dormancy. The results suggest that (1) seed dormancy of H. mantegazzianum was not completely broken until the first spring, but that some seeds re-enter or retain dormancy during high summer temperatures and that (2) the threshold needed for breaking the dormancy was achieved gradually during the cold autumn and winter months. However, in a small fraction of seeds the dormancy breaking process took several years. Of seeds buried in 10 different regions of the Czech Republic, on average 8.8% survived 1 year, 2.7% 2 years and 1.2% remained viable and dormant after 3 years of burial. The ability of even small fraction of H. mantegazzianum seeds to survive for at least 3 years can result in re-invasion of this species into controlled sites. Workplace Institute of Botany Contact Martina Bartošová, martina.bartosova@ibot.cas.cz, ibot@ibot.cas.cz, Tel.: 271 015 242 ; Marie Jakšová, marie.jaksova@ibot.cas.cz, Tel.: 384 721 156-8 Year of Publishing 2007
Number of the records: 1