Physiological dormancy in forbs native to south-west Queensland: Diagnosis and classification

Hoyle, G. L., Steadman, K. J., Daws, M. I. and Adkins, S. W. (2008) Physiological dormancy in forbs native to south-west Queensland: Diagnosis and classification. South African Journal of Botany, 74 2: 208-213. doi:10.1016/j.sajb.2007.11.005


Author Hoyle, G. L.
Steadman, K. J.
Daws, M. I.
Adkins, S. W.
Title Physiological dormancy in forbs native to south-west Queensland: Diagnosis and classification
Journal name South African Journal of Botany   Check publisher's open access policy
ISSN 0254-6299
Publication date 2008-04
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.sajb.2007.11.005
Volume 74
Issue 2
Start page 208
End page 213
Total pages 6
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Collection year 2008
Language eng
Subject C1
270402 Plant Physiology
771003 Living resources (flora and fauna)
0607 Plant Biology
Formatted abstract
 Seed physiological dormancy (PD) is reportedly the primary reason why many Australian native plants are not currently used for revegetation of degraded land. However knowledge of germination and dormancy of forb species from semi-arid environments is lacking. Consequently, we investigated germination of 15 Australian forb species from four families, particularly Asteraceae, native to south–west Queensland (Qld). Seeds were tested for viability using tetrazolium chloride (TZ) and sown at 5 to 35 °C. Nine species, including seven Asteraceae, achieved germination exceeding or not significantly lower (P > 0.05) than TZ test results. Despite spring dispersal, the majority of species had optimal germination at temperatures reminiscent of winter months. Only six species exhibited low germination across all temperatures investigated when compared to TZ results (P < 0.05), i.e. low germination could not be attributed to low seed viability. Of these, Actinobole uliginosum (Asteraceae) had non-deep PD since seeds responded to gibberellic acid (GA3) and dry after-ripening. In contrast, Goodenia fascicularis appeared to exhibit deep PD since seeds did not respond to GA3 or dry after-ripening, and scarification led to germination of abnormal seedlings. It appears that, contrary to expectations, seeds of many forbs native to south–west Qld (9 of 15 in this study), possess negligible or no dormancy and may therefore be suitable for use in land rehabilitation. Other species e.g. G. fascicularis require further work to investigate dormancy mechanisms and develop reliable germination techniques before seeds can be used effectively.
Keyword Australia
Germination
Physiological dormancy
Seed
Temperature
Q-Index Code C1
Q-Index Status Confirmed Code
Additional Notes Available online 4 December 2007.

 
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Created: Wed, 23 Apr 2008, 11:55:55 EST by Elizabeth Pyke on behalf of Faculty Of Nat Resources, Agric & Veterinary Sc