Occurrence of physical dormancy in seeds of Australian Sapindaceae: A survey of 14 species in nine genera

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 9: 1349-1362. doi:10.1093/aob/mcn043

Author Cook, A.
Turner, S. R.
Baskin, J. M.
Baskin, C. C.
Steadman, K. J.
Dixon, K. W.
Title Occurrence of physical dormancy in seeds of Australian Sapindaceae: A survey of 14 species in nine genera
Journal name Annals of Botany   Check publisher's open access policy
ISSN 0305-7364
Publication date 2008-06
Sub-type Article (original research)
DOI 10.1093/aob/mcn043
Volume 101
Issue 9
Start page 1349
End page 1362
Total pages 14
Place of publication Oxford, U.K.
Publisher Oxford Univ Press
Collection year 2009
Language eng
Subject C1
771003 Living resources (flora and fauna)
270402 Plant Physiology
0607 Plant Biology
Formatted abstract
Background and Aims:
Sapindaceae is one of 16 angiosperm families whose seeds have physical dormancy (PY). However, the extent and nature of PY within this family is poorly known. The primary aims of this study were: (1) to evaluate seed characteristics and determine presence (or not) of PY within nine genera of Australian Sapindaceae; and (2) to compare the frequency of PY across the phylogenetic tree within Australian Sapindaceae.
Viability, imbibition and seed characteristics were assessed for 14 taxa from nine genera of Sapindaceae. For five species of Dodonaea, optimal conditions for germination and dormancy break were evaluated. An in situ burial experiment was performed on D. hackettiana seeds to identify the factor(s) responsible for overcoming PY. Classes of dormancy and of non-dormancy for 26 genera of Sapindaceae were mapped onto a phylogenetic tree for the family.
Key Results:
Mean seed viability across all taxa was 69·7 %. Embryos were fully developed and folded (seven genera) or bent (two genera); no endosperm was present. Seeds of all five Dodonaea spp. and of Distichostemon hispidulus had PY. Hot-water treatment released PY in these six species. Optimal germination temperature for seeds of the four Dodonaea spp. that germinated was 15–20 °C. Following 5 months burial in soil, 36·4 % of D. hackettiana seeds had lost PY and germinated by the beginning of the winter wet season (May). Laboratory and field data indicate that dormancy was broken by warm, moist temperatures (≥50 °C) during summer.
PY occurs infrequently in genera of Sapindaceae native to Australia. Seeds of Dodonaea and Distichostemon had PY, whereas those of the other seven genera did not. Seeds of these two genera and of Diplopeltis (a previous study) are the only three of the 20 native Australian genera of Sapindaceae for which germination has been studied that have PY; all three belong to subfamily Dodonaeoideae.
Keyword Dodonaea spp.
Physical dormancy
Seed ecology
Seed germination
Q-Index Code C1
Q-Index Status Confirmed Code
Additional Notes AOBPreview originally published online on March 27, 2008

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Pharmacy Publications
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Created: Tue, 31 Mar 2009, 13:32:17 EST by Elizabeth Pyke on behalf of Faculty Of Health Sciences