Identification and characterization of the water gap in the physically dormant seeds of Dodonaea petiolaris: a first report for Sapindaceae

Turner, Shane., Cook, A., Baskin, J. M., Baskin, C. C., Tuckett, R. E., Steadman, K. J. and Dixon, K. W. (2009) Identification and characterization of the water gap in the physically dormant seeds of Dodonaea petiolaris: a first report for Sapindaceae. Annals of botany, 104 5: 833-844. doi:10.1093/aob/mcp171


Author Turner, Shane.
Cook, A.
Baskin, J. M.
Baskin, C. C.
Tuckett, R. E.
Steadman, K. J.
Dixon, K. W.
Title Identification and characterization of the water gap in the physically dormant seeds of Dodonaea petiolaris: a first report for Sapindaceae
Formatted title
Identification and characterization of the water gap in the physically dormant seeds of Dodonaea petiolaris: a first report for Sapindaceae
Journal name Annals of botany   Check publisher's open access policy
ISSN 0305-7364
Publication date 2009-10
Year available 2009
Sub-type Article (original research)
DOI 10.1093/aob/mcp171
Volume 104
Issue 5
Start page 833
End page 844
Total pages 12
Editor Barnett, J. R.
Heslop-Harrison, J. S.
Frost, D.
Place of publication London, U.K
Publisher Oxford University Press
Collection year 2010
Language eng
Subject C1
060705 Plant Physiology
961205 Rehabilitation of Degraded Mining Environments
Abstract Background and Aims The Sapindaceae is one of 17 plant families in which seed dormancy is caused by a water-impermeable seed or fruit coat (physical dormancy, PY). However, until now the water gap in Sapindaceae had not been identified. The primary aim of this study was to identify the water gap in Dodonaea petiolaris (Sapindaceae) seeds and to describe its basic morphology and anatomy. Methods Seed fill, viability, water-uptake (imbibition) and other characteristics were assessed for D. petiolaris seeds. The location and structure of the water gap were investigated using a blocking experiment, time series photography, scanning electron microscopy and light microscopy. Dodonaea petiolaris seeds with PY also were assessed for loss of PY at four ecologically significant temperatures under moist and dry conditions. Seeds of three other species of Sapindaceae were examined for presence of a water gap. † Key Results The water gap in D. petiolaris seeds was identified as a small plug in the seed coat adjacent to the hilum and opposite the area where the radicle emerges. The plug was dislodged (i.e. water gap opened ¼ dormancy break) by dipping seeds in boiling water for 2.5 min or by incubating seeds on a moist substrate at 20/35 8C for 24 weeks. Layers of cells in the plug, including palisade and subpalisade, are similar to those in the rest of the seed coat. The same kind of water gap was found in three other species of Sapindaceae, Diplopeltis huegelii, Distichostemon hispidulus and Dodonaea aptera. †Conclusions Following dormancy break (opening of water gap), initial uptake of water by the seed occurs only through the water gap. Thus, the plug must be dislodged before the otherwise intact seed can germinate. The anatomy of the plug is similar to water gaps in some of the other plant families with PY.
Keyword Dodonaea petiolaris
Water gap
Seed germination
Seed ecology
Sapindaceae
Physical dormancy
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: Fri, 06 Nov 2009, 15:17:30 EST by Charna Kovacevic on behalf of School of Pharmacy