Mimicking a semi-arid tropical environment achieves dormancy alleviation for seeds of Australian native Goodeniacceae and Asteracceae

Hoyle, G. L., Daws, M. I., Steadman, K. J. and Adkins, S. W. (2008) Mimicking a semi-arid tropical environment achieves dormancy alleviation for seeds of Australian native Goodeniacceae and Asteracceae. Annals of Botany, 101 5: 701-708. doi:10.1093/aob/mcn009


Author Hoyle, G. L.
Daws, M. I.
Steadman, K. J.
Adkins, S. W.
Title Mimicking a semi-arid tropical environment achieves dormancy alleviation for seeds of Australian native Goodeniacceae and Asteracceae
Journal name Annals of Botany   Check publisher's open access policy
ISSN 0305-7364
0003-4754
1095-8290
Publication date 2008-04-01
Year available 2008
Sub-type Article (original research)
DOI 10.1093/aob/mcn009
Open Access Status DOI
Volume 101
Issue 5
Start page 701
End page 708
Total pages 8
Place of publication Oxford, U.K.
Publisher Oxford University Press
Language eng
Subject C1
060705 Plant Physiology
961205 Rehabilitation of Degraded Mining Environments
0607 Plant Biology
Abstract Background and Aims Seed physiological dormancy (PD) limits the use and conservation of some of Queensland's (Qld) native forb species. It was hypothesised that optimum dormancy-alleviating treatments would reflect environmental conditions that seeds experience in situ, and this premise was tested for PD seeds of four species native to south-west Qld.
Formatted abstract
Background and Aims:
Seed physiological dormancy (PD) limits the use and conservation of some of Queensland's (Qld) native forb species. It was hypothesised that optimum dormancy-alleviating treatments would reflect environmental conditions that seeds experience in situ, and this premise was tested for PD seeds of four species native to south-west Qld.
Methods:
High temperatures and increased rainfall during summer are characteristic of this semi-arid tropical environment. Ex situ treatments were designed to mimic conditions that seeds dispersed in spring experience during the summer months before germinating in cooler autumn temperatures. Seeds received between 4 and 20 weeks of a dry after-ripening (DAR), warm stratification or dry/wet cycling treatment (DAR interspersed with short periods of warm stratification), in darkness, before being transferred to germination test conditions. In addition, natural dormancy alleviation of one of the Goodeniaceae species was investigated in situ.
Key Results:
Dry/wet cycling resulted in higher levels of germination of Actinobole uliginosum (Asteraceae), Goodenia cycloptera and Velleia glabrata (Goodeniaceae) when compared with constant DAR or stratification, while Goodenia fascicularis (Goodeniaceae) responded better to short durations of warm stratification. Long durations of DAR partially alleviated PD of A. uliginosum; however, stratification induced and maintained dormancy of this species. Modifications to the dry/wet cycling treatment and germination test conditions based on data collected in situ enabled germination of G. cycloptera and V. glabrata to be further improved.
Conclusions:
Treatments designed using temperature, relative humidity and rainfall data for the period between natural seed dispersal and germination can successfully alleviate PD. Differences between the four species in conditions that resulted in maximum germination indicate that, in addition to responding to broad-scale climate patterns, species may be adapted to particular microsites and/or seasonal conditions.
Keyword Seed dormancy
Germination
Dry after-ripening
Dry/wet cycling
South-west Queensland
Australia
Semi-arid tropical
Actinobole uliginosum
Asteraceae
Goodenia fascicularis
Goodenia cycloptera
Velleia glabrata
Goodeniaceae
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Agriculture and Food Sciences
School of Pharmacy Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 23 times in Thomson Reuters Web of Science Article | Citations
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Created: Sat, 04 Apr 2009, 02:50:33 EST by Emma Cushworth on behalf of School of Land, Crop and Food Sciences