Dormancy, germination and seed bank storage: A study in support of ex situ conservation of macrophytes of southwest Australian temporary pools
MetadataShow full item record
Vernal pools and rock pools (gnammas) in the Southwest Australian Floristic Region are forms of temporary wetlands that are under threat. Some of their aquatic macrophytes are rare and/or endemic, and there is a need to develop off-site seed banks to assure their conservation. Here, we report results of the first comprehensive study of the seed germination, dormancy and seed storage behaviour of nine indigenous macrophyte species. Seeds of Glossostigma drummondii, Myriophyllum balladoniense, M. lapidicola, M. petreaum and Triglochin linearis were non-dormant, whereas those of Damasonium minus, Glossostigma sp. (currently undescribed), G. trichodes and Myriophyllum crispatum were dormant. Non-dormant seeds germinated over a range of temperatures (5-20 °C) but temperatures at which highest germination occurred were species specific. All species demonstrated a germination preference for the light. Warm stratification substantially increased germination of dormant Glossostigma trichodes seeds and all dormancy-breaking treatments partially overcame dormancy in Glossostigma spp. Seeds possessed orthodox storage behaviour (tolerating drying to 5% moisture content and storage at -18 °C) and are thus amenable to seed banking as a means of ex situ conservation. It appears that seeds of most species are able to germinate upon inundation as long as they are situated at the soil surface. Thus, species are opportunistic and respond to the first rains of the season providing prompt ecological cuing in an environment vulnerable to rapid drying events. Maintaining the integrity of the soil crust may be an important first step for on-site conservation if seeds are in the superficial layers. © 2010 Blackwell Publishing Ltd.
Showing items related by title, author, creator and subject.
Seed Treatment Optimizes Benefits of Seed Bank Storage for Restoration-Ready Seeds: The Feasibility of Prestorage Dormancy Alleviation for Mine-Site RevegetationTurner, S.; Steadman, K.; Vlahos, S.; Koch, J.; Dixon, Kingsley (2013)Dormant seeds of 18 species from 9 families covering a diverse range of seed dormancy syndromes and life histories from the southwest Australian biodiversity hotspot were assessed for germinability following storage at ...
Sympatric species of Hibbertia (Dilleniaceae) vary in dormancy break and germination requirements: Implications for classifying morphophysiological dormancy in Mediterranean biomesHidayati, S.; Walck, J.; Merritt, D.; Turner, S.; Turner, D.; Dixon, Kingsley (2012)Background and Aims: Several ecologically important plant families in Mediterranean biomes have seeds with morphophysiological dormancy (MPD) but have been poorly studied. The aim of this study was to understand the seed ...
Seed germination of the carnivorous plant Byblis gigantea (Byblidaceae) is cued by warm stratification and karrikinolideCross, A.; Merritt, D.; Turner, S.; Dixon, Kingsley (2013)Byblidaceae is one of the most poorly studied carnivorous plant families, with seed dormancy and germination biology remaining unresolved. This knowledge deficit has significant conservation and management implications, ...