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Germination niche of the permanent wetland specialist, Parnassia grandifolia DC

Published online by Cambridge University Press:  22 May 2014

Matthew A. Albrecht  and
Quinn G. Long
Matthew A. Albrecht*
Affiliation:
Center for Conservation and Sustainable Development, Missouri Botanical Garden, PO Box 299, St. Louis, MO 63166, USA
Quinn G. Long
Affiliation:
Center for Conservation and Sustainable Development, Missouri Botanical Garden, PO Box 299, St. Louis, MO 63166, USA
*
*Correspondence E-mail: matthew.albrecht@mobot.org
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Abstract

Temperate wetland species often require light and warm temperatures for seed germination. However, recent studies indicate that species which specialize on permanently saturated wetlands that are maintained by groundwater discharge (fens, seeps and mountain springs), rather than wetlands with surface-water-driven hydrologic regimes, diverge from the typical wetland germination niche by germinating at cool temperatures and lacking photoblastic seeds. We conducted laboratory experiments that manipulated stratification conditions (non-stratified versus cold stratification in light and darkness), thermal regime (15/6, 25/15 and 35/20°C), and light (14 h photoperiod versus continuous darkness) to test whether seeds of the North American calcareous fen specialist Parnassia grandifolia diverged from the typical temperate wetland germination niche. After 30 d, fresh seeds were conditionally dormant and could only germinate to high percentages in light at 25/15°C. During 16 weeks of incubation, non-stratified seeds germinated to low percentages ( < 40%) at all thermal regimes in darkness. In contrast, cold-stratified seeds germinated to high percentages in both light and darkness at all thermal regimes, although germination was incomplete (no cotyledon emergence) at 35/20°C. Further, seeds did not require light during cold stratification to germinate to high percentages when incubated in light or darkness. Thus, seeds diverged from the typical temperate wetland germination syndrome in lacking a light and warm temperature requirement for germination. Our results reinforce previous work from European fens and Mediterranean wetlands. This indicates that multiple germination strategies are found in fen wetlands that are maintained by the continuous or near-continuous discharge of cool groundwater.

Keywords

cold stratificationdark germinationdormancyParnassia, wetland
Type
Research Papers
Information
Seed Science Research , Volume 24 , Issue 3 , September 2014 , pp. 239 - 245
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Copyright
Copyright © Cambridge University Press 2014 

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References

Albrecht, M. and McCarthy, B. (2011) Variation in dormancy and germination in three co-occurring perennial forest herbs. Plant Ecology 212, 1465–1477.CrossRefGoogle Scholar
Baskin, C.C. and Baskin, J.M. (2001) Seeds: ecology, biogeography, and evolution of dormancy and germination. San Diego, California, Academic Press.Google Scholar
Baskin, C.C. and Baskin, J.M. (2003) Seed germination and propagation of Xyris tennesseensis, a federal endangered wetland species. Wetlands 23, 116–124.CrossRefGoogle Scholar
Baskin, C.C., Baskin, J.M. and Chester, E.W. (1993) Seed germination ecophysiology of four summer annual mudflat species of Cyperaceae. Aquatic Botany 45, 41–52.Google Scholar
Baskin, J.M. and Baskin, C.C. (2004) A classification system for seed dormancy. Seed Science Research 14, 1–16.Google Scholar
Bedford, B. and Godwin, K. (2003) Fens of the United States: distribution, characteristics, and scientific connection versus legal isolation. Wetlands 23, 608–629.Google Scholar
Bliss, L.C. (1958) Seed germination in arctic and alpine species. Arctic 11, 180–188.CrossRefGoogle Scholar
Brändel, M. (2006) Effect of temperatures on dormancy and germination in three species in the Lamiaceae occurring in northern wetlands. Wetlands Ecology and Management 14, 11–28.Google Scholar
Carta, A., Bedini, G., Müller, J.V. and Probert, R.J. (2013) Comparative seed dormancy and germination of eight annual species of ephemeral wetland vegetation in a Mediterranean climate. Plant Ecology 214, 339–349.Google Scholar
Casanova, M.T. and Brock, M.A. (2000) How do depth, duration and frequency of flooding influence the establishment of wetland plant communities? Plant Ecology 147, 237–250.CrossRefGoogle Scholar
Crawley, M.J. (2007) The R book. London, John Wiley & Sons.CrossRefGoogle Scholar
Farmer, R.E. Jr (1980) Germination and juvenile growth characteristics of Parnassia asarifolia . Bulletin of the Torrey Botanical Club 107, 19–23.Google Scholar
Fernández-Pascual, E., Jiménez-Alfaro, B., García-Torrico, A.I., Pérez-García, F. and Díaz, T.E. (2012) Germination ecology of the perennial Centaurium somedanum, a specialist species of mountain springs. Seed Science Research 22, 199–205.Google Scholar
Fernández-Pascual, E., Jiménez-Alfaro, B. and Díaz, T. (2013) The temperature dimension of the seed germination niche in fen wetlands. Plant Ecology 214, 489–499.Google Scholar
Grime, J.P., Mason, G., Curtis, A.V., Rodman, J. and Band, S.R. (1981) A comparative study of germination characteristics in a local flora. Journal of Ecology 69, 1017–1059.CrossRefGoogle Scholar
Gu, C. and Hultgård, U.M. (2001) Parnassia. pp. 358–379 in Wu, C.Y.; Raven, P.H. (Eds) Flora of China. Beijing and St. Louis, Science Press and Missouri Botanical Garden Press.Google Scholar
Hájek, M., Horsak, M., Hajkova, P. and Dite, D. (2006) Habitat diversity of central European fens in relation to environmental gradients and an effort to standardise fen terminology in ecological studies. Perspectives in Plant Ecology, Evolution and Systematics 8, 97–114.Google Scholar
Ignacio Galinato, M. and Van Der Valk, A.G. (1986) Seed germination traits of annuals and emergents recruited during drawdowns in the Delta Marsh, Manitoba, Canada. Aquatic Botany 26, 89–102.Google Scholar
Jensen, K. (2004) Dormancy patterns, germination ecology, and seed-bank types of twenty temperate fen grassland species. Wetlands 24, 152–166.CrossRefGoogle Scholar
Karlsson, L.M. and Milberg, P. (2007) A comparative study of germination ecology of four Papaver taxa. Annals of Botany 99, 935–946.CrossRefGoogle ScholarPubMed
Kettenring, K.M. and Galatowitsch, S.M. (2007) Temperature requirements for dormancy break and seed germination vary greatly among 14 wetland Carex species. Aquatic Botany 87, 209–220.Google Scholar
Kettenring, K.M., Gardner, G. and Galatowitsch, S.M. (2006) Effect of light on seed germination of eight wetland Carex species. Annals of Botany 98, 869–874.Google Scholar
Leck, M.A. (1996) Germination of macrophytes from a Delaware River tidal freshwater wetland. Bulletin of the Torrey Botanical Club 123, 48–67.Google Scholar
Lenth, R.V. (2013) lsmeans: Least-square means. R package version 1.10-4. Available at http://CRAN.R-project.org/packages = lsmeans (accessed 21 February 2014)..Google Scholar
Lichvar, R.W. (2013) The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 49, 1–241.Google Scholar
Maas, D. (1989) Germination characteristics of some plant species from calcareous fens in southern Germany and their implications for the seed bank. Holarctic Ecology 12, 337–344.Google Scholar
NatureServe (2013) NatureServe Web Service. Arlington, Virginia, USA. Available at http://services.natureserve.org (accessed 15 September 2013).Google Scholar
Patzelt, A., Wild, U. and Pfadenhauer, J. (2001) Restoration of wet fen meadows by topsoil removal: vegetation development and germination biology of fen species. Restoration Ecology 9, 127–136.Google Scholar
Porceddu, M., Mattana, E., Pritchard, H.W. and Bacchetta, G. (2013) Thermal niche for in situ seed germination by Mediterranean mountain streams: model prediction and validation for Rhamnus persicifolia seeds. Annals of Botany 112, 1887–1897.Google Scholar
R Development Core Team (2013) R: A language and environment for statistical computing. Vienna, Austria, R Foundation for Statistical Computing.Google Scholar
Ritz, C. and Streibig, J.C. (2005) Bioassay analysis using R. Journal of Statistical Software 12(5).Google Scholar
Ritz, C., Pipper, C.B. and Streibig, J.C. (2013) Analysis of germination data from agricultural experiments. European Journal of Agronomy 45, 1–6.Google Scholar
Schat, H. (1983) Germination ecology of some dune slack pioneers. Acta Botanica Neerlandica 32, 203–212.Google Scholar
Schütz, W. (1997) Are germination strategies important for the ability of cespitose wetland sedges (Carex) to grow in forests? Canadian Journal of Botany - Revue Canadienne De Botanique 75, 1692–1699.Google Scholar
Schütz, W. (2000) Ecology of seed dormancy and germination in sedges (Carex). Perspectives in Plant Ecology, Evolution and Systematics 3, 67–89.Google Scholar
Seabloom, E.W., van der Valk, A.G. and Moloney, K.A. (1998) The role of water depth and soil temperature in determining initial composition of prairie wetland coenoclines. Plant Ecology 138, 203–216.Google Scholar
Thompson, K. and Grime, J.P. (1983) A comparative study of germination responses to diurnally-fluctuating temperatures. Journal of Applied Ecology 20, 141–156.Google Scholar
Van Assche, J., Van Nerum, D. and Darius, P. (2002) The comparative germination ecology of nine Rumex species. Plant Ecology 159, 131–142.Google Scholar