Germination behaviour of Astroloma xerophyllum (Ericaceae), a species with woody indehiscent endocarps

Turner, Shane R., Commander, Lucy E., Baskin, Jerry M., Baskin, Carol C. and Dixon, Kingsley W. (2009) Germination behaviour of Astroloma xerophyllum (Ericaceae), a species with woody indehiscent endocarps. Botanical Journal of the Linnean Society, 160 3: 299-311. doi:10.1111/j.1095-8339.2009.00981.x

Author Turner, Shane R.
Commander, Lucy E.
Baskin, Jerry M.
Baskin, Carol C.
Dixon, Kingsley W.
Title Germination behaviour of Astroloma xerophyllum (Ericaceae), a species with woody indehiscent endocarps
Formatted title
Germination behaviour of Astroloma xerophyllum (Ericaceae), a species with woody indehiscent endocarps
Journal name Botanical Journal of the Linnean Society   Check publisher's open access policy
ISSN 0024-4074
Publication date 2009-01-01
Sub-type Article (original research)
DOI 10.1111/j.1095-8339.2009.00981.x
Open Access Status Not yet assessed
Volume 160
Issue 3
Start page 299
End page 311
Total pages 13
Editor M. F. Fay
Place of publication United Kingdom
Publisher Wiley-Blackwell Publishing Ltd.
Language eng
Subject C1
050202 Conservation and Biodiversity
050207 Environmental Rehabilitation (excl. Bioremediation)
060799 Plant Biology not elsewhere classified
960806 Forest and Woodlands Flora, Fauna and Biodiversity
961206 Rehabilitation of Degraded Mountain and High Country Environments
Abstract The dispersal unit of many Ericaceae comprises an ovoid drupe with a woody indehiscent endocarp, and diaspores of this type are notoriously difficult to germinate for most members of this widely distributed family. Within the biodiverse south-west of Western Australia, more than 200 drupaceous species of Ericaceae have been described, more than 50 of which are considered to be rare and threatened, requiring significant conservation action in the near future. In this paper, we investigate the germination ecology of the common Australian endemic, Astroloma xerophyllum, as a proxy for closely related threatened taxa, focusing on the ex situ and in situ germination requirements of seeds and indehiscent endocarps. Each endocarp possessed up to seven locules and means of 2.0–3.4 seeds per endocarp from the two collections used in this study. Seeds were up to 2.74 mm in length and 100% viable. Embryos were linear, differentiated and approximately 1.3 mm in length. Seeds within endocarps imbibed water to 28%, whereas excised seeds became hydrated to 44%. Fifty-five per cent of seeds extracted from endocarps germinated on water agar alone and 100% germinated when presoaked in gibberellic acid. Seeds remaining inside intact endocarps failed to germinate unless treated with a germination promoter and incubated for more than 20 weeks. Rapid germination of seeds in intact endocarps was promoted by soaking endocarps in gibberellic acid and incubating them in 100% O2. Embryos grew substantially in length within seeds prior to germination, and thus seeds have morphophysiological dormancy. Seeds under natural conditions required several seasons to germinate to any degree.
Keyword Epacridaceae
seed dormancy
gibberellic acid
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Pharmacy Publications
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Created: Tue, 04 Aug 2009, 01:57:05 EST by Charna Kovacevic on behalf of School of Pharmacy