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Seed dormancy and germination in the Australian baobab, Adansonia gregorii F. Muell.

Published online by Cambridge University Press:  01 December 2009

S.R. Turner  and
K.W. Dixon
S.R. Turner*
Affiliation:
Kings Park and Botanic Garden, West Perth, WA6005, Australia Faculty of Health Sciences, School of Pharmacy, The University of Queensland, Brisbane, QLD4072, Australia
K.W. Dixon
Affiliation:
Kings Park and Botanic Garden, West Perth, WA6005, Australia Faculty of Natural and Agricultural Sciences, School of Plant Biology, The University of Western Australia, Crawley, WA6009, Australia
*
*Correspondence Fax: +61 9480 3641 E-mail: [email protected]
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Abstract

Seeds of the iconic Australian baobab Adansonia gregorii display physical dormancy (PY) and germinate readily once they become water permeable, a trait found in most other species in this genus. Highest germination (100%) was observed when seeds were placed in concentrated sulphuric acid (H2SO4) for 24 h, although exposure to H2SO4 for 6–12 h also resulted in >85% germination. Exposure to boiling water for 1–5 min was far less effective in promoting germination (0–23%), although a high number of seeds were water permeable (67–99%) following boiling water treatment. However, the majority of these water-permeable seeds appeared to have been injured by boiling water exposure. Germination at warmer temperatures (30 or 35°C) was found to be optimal (81–83% germination) and proceeded rapidly, with maximum germination occurring after incubation for only 8 d. In comparison, germination at 15–25°C resulted in 3–67% germination over a longer time frame (up to 20 d). While seeds of A. gregorii display PY they are unusually sensitive to dipping in boiling water and are therefore atypical when compared to most other Adansonia species.

Keywords

Adansonia gregoriiboabbaobabdormancygerminationPY
Type
Short Communication
Information
Seed Science Research , Volume 19 , Issue 4 , December 2009 , pp. 261 - 266
Copyright
Copyright © Cambridge University Press 2009

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References

Angiosperm Phylogeny Group (2003) An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II. Botanical Journal of the Linnean Society 141, 399–436.CrossRefGoogle Scholar
Auld, T.D. and O'Connell, M.A. (1991) Predicting patterns of post fire germination in 35 eastern Australian fabaceae. Australian Journal of Ecology 16, 53–70.CrossRefGoogle Scholar
Baskin, C.C. and Baskin, J.M. (1998) Seeds: ecology, biogeography and evolution of dormancy and germination. San Diego, California, USA, Academic Press.Google Scholar
Baskin, J.M., Baskin, C.C. and Li, X. (2000) Taxonomy, ecology, and evolution of physical dormancy in seeds. Plant Species Biology 15, 139–152.CrossRefGoogle Scholar
Baskin, J.M., Davis, B.H., Baskin, C.C., Gleason, S.M. and Cordell, S. (2004) Physical dormancy in seeds of Dodonaea viscosa (Sapindales, Sapindaceae) from Hawaii. Seed Science Research 14, 81–90.CrossRefGoogle Scholar
Baskin, J.M., Baskin, C.C. and Dixon, K.W. (2006) Physical dormancy in the endemic Australian genus Stylobasium, a first report for the family Surianaceae (Fabales). Seed Science Research 16, 229–232.CrossRefGoogle Scholar
Baum, D.A. (1995) A systematic revision of Adansonia (Bombacaceae). Annals of Missouri Botanical Garden 82, 440–470.CrossRefGoogle Scholar
Bindon, P. (1996) Useful bush plants. Perth, WA, Australia, Western Australia Museum.Google Scholar
Bureau of Meteorology (2008) Commonwealth of Australia. Available athttp://www.bom.gov.au/ (accessed 27 November 2008).Google Scholar
Cook, A., Turner, S.R., Baskin, J.M., Baskin, C.C., Steadman, K.J. and Dixon, K.W. (2008) Occurrence of physical dormancy in seeds of Australian Sapindaceae: a survey of 14 species in nine genera. Annals of Botany 101, 1349–1362.CrossRefGoogle ScholarPubMed
Johnson, P.R., Green, E.J., Crowhurst, M. and Robinson, C.J. (2006) Commercialisation of boab tubers. Kingston, ACT, Australia, Rural Industries Research and Development Corporation, RIRDC Publication No. 06/022.Google Scholar
Paczkowska, G. and Chapman, A.R. (2000) The Western Australian flora. Perth, WA, Australia, Wildflower Society Inc. Western Australian Herbarium, CALM and Botanic Gardens and Parks Authority.Google Scholar
Razanameharizaka, J., Grouzis, M., Ravelomanana, D. and Danthu, P. (2006) Seed storage behaviour and seed germination in African and Malagasy baobabs (Adansonia species). Seed Science Research 16, 83–88.CrossRefGoogle Scholar
Turner, S.R., Merritt, D.J., Baskin, C.C., Dixon, K.W. and Baskin, J.M. (2005) Physical dormancy in seeds of six genera of Australian Rhamnaceae. Seed Science Research 15, 51–58.CrossRefGoogle Scholar
Turner, S.R., Merritt, D.J., Baskin, J.M., Baskin, C.C. and Dixon, K.W. (2006) Combinational dormancy in seeds of the Western Australian endemic species Diplopeltis huegelii (Sapindaceae). Australian Journal of Botany 54, 1–6.CrossRefGoogle Scholar
Western Australian Herbarium (1998) FloraBase — The Western Australian Flora. Department of Environment and Conservation. Available athttp://florabase.dec.wa.gov.au (accessed 27 November 2008).Google Scholar