NDLI: Comparative seed dormancy and germination of eight annual species of ephemeral wetland vegetation in a Mediterranean climate

Content Provider	Springer Nature Link
Author	Carta, Angeli Bedini, Gianni Müller, Jonas V. Probert, Robin J.
Copyright Year	2013
Abstract	Ephemeral wetland vegetation (EWV) in the Mediterranean Basin appears in temporary wetlands where favourable hydrological conditions exist only for a short time and year-to-year variability is high. Here, we report results of the seed germination, dormancy and desiccation tolerance of eight annual species living in this vulnerable habitat. Experiments were performed in laboratory conditions under constant and alternating temperatures and using a 12-h daily photoperiod or continuous darkness. Whilst germination and dormancy differed between the species, seeds demonstrated an absolute light requirement and prefer cool temperatures to germinate (mean ≤15 °C). Logistic regression analysis showed significant effects of alternating temperature in all the species except in Tillaea vaillantii whose germination was stimulated by constant temperature. Mean temperature was a significant term in the logistic models for the dormant species Cicendia filiformis, Linum radiola and T. vaillantii for which after-ripening was an effective dormancy-breaking treatment. From these results we infer three strategies of regeneration by seeds: (1) species germinating during the whole vegetative season (2) species germinating in a narrow temperature niche and (3) species requiring flooding (T. vaillantii). Seeds possessed orthodox storage behaviour (tolerating drying to 15 % relative humidity) and may be amenable to seed banking as a means of ex-situ conservation. We conclude that EWV species are adapted to the irregular presence of water with characteristics that are typical of neither truly aquatic nor wetland plants. These EWV species showed a more plastic germination response based on alternating and constant temperature sensitivity and a low proportion of dormant seeds.
Starting Page	339
Ending Page	349
Page Count	11
File Format	PDF
ISSN	13850237
Journal	Plant Ecology
Volume Number	214
Issue Number	2
e-ISSN	15735052
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-01-30
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Seed Dormancy After-ripening Ephemeral wetland vegetation Mediterranean Basin Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology Plant Science

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