Smoke Enhanced Seed Germination for Mine Rehabilitation in the Southwest of Western Australia

1997 ◽  
Vol 5 (3) ◽  
pp. 191-203 ◽  
Author(s):  
Shauna Roche ◽  
John M. Koch ◽  
Kingsley W. Dixon
Keyword(s):  
Seed Germination ◽  
Western Australia ◽  
Mine Rehabilitation

Modelling seed germination response to temperature inEucalyptusL'Her. (Myrtaceae) species in the context of global warming

2017 ◽  
Vol 27 (2) ◽  
pp. 99-109 ◽  
Author(s):  
Anne Cochrane
Keyword(s):  
Life History ◽  
Seed Germination ◽  
Western Australia ◽  
Thermal Tolerance ◽  
Greenhouse Gas Emission ◽  
Climate Scenario ◽  
Wet Season ◽  
Physiological Tolerance ◽  
Species Vulnerability ◽  
Germination Timing

AbstractSeed germination is vital for persistence of many plant species, and is linked to local environmental conditions. Small increases in temperature during this critical life history transition may threaten species by altering germination timing and success. Such changes in turn may influence population dynamics, community composition and the geographic distributions of species. In this investigation, a bi-directional temperature gradient plate was used to profile thermal constraints for germination in 26 common, threatened and geographically restrictedEucalyptusspecies (Myrtaceae) from southern Western Australia. These observed data were used to populate models to predict optimum germination responses (mean time to germination, germination timing and success) under current (1950–2000 averages) and future (2070 high greenhouse gas emission climate scenario) mean monthly minimum and maximum temperatures. Many species demonstrated wide physiological tolerance for high germination temperatures and an ability to germinate outside current and forecast future autumn–winter wet season temperatures, suggesting that climatic distribution is a poor proxy for thermal tolerance forEucalyptusseed germination. Germination for some species is predicted to decline under forecast conditions, but the majority will maintain or improve germination particularly during the cooler winter months of the year. Although thermal tolerance may benefit persistence of manyEucalyptusspecies in southern Western Australia as warming becomes more severe, large rainfall declines are also forecast which may prove more detrimental to plant survival. Nonetheless, this framework has the potential to identify seed resilience to heat stress in an early life history phase and hence species vulnerability to one characteristic of forecast environmental change.

Seed germination ecology in southwestern Western Australia

1993 ◽  
Vol 59 (1) ◽  
pp. 24-73 ◽  
Author(s):  
David T. Bell ◽  
Julie A. Plummer ◽  
Susan K. Taylor
Keyword(s):  
Seed Germination ◽  
Western Australia ◽  
Germination Ecology

Temperature Effects on the Seed-Germination of 10 Kwongan Species From Eneabba, Western-Australia

1990 ◽  
Vol 38 (5) ◽  
pp. 451 ◽  
Author(s):  
SM Bellairs ◽  
DT Bell
Keyword(s):  
High Temperature ◽  
Seed Germination ◽  
Western Australia ◽  
Low Temperatures ◽  
Temperature Effects ◽  
Perennial Species ◽  
Wetting And Drying ◽  
High And Low Temperatures ◽  
Western Australian

The germination responses of 10 species (Acacia blakelyi, A. pulchella, Allocasuarina humilis, Beaufortia elegans, Conostylis neocymosa, Eucalyptus tetragona, Kennedia prostrata, Leptospermum spinescens, Melaleuca acerosa and Xanthorrhoea drummondii) to constant temperatures ranging from 5 to 35� C were studied. These Western Australian perennial species had optimum germination percentages between 15 and 20�C, except Eucalyptus tetragona which had an optimum at 25�C and Leptospermum spinescens which had an optimum at 10�C. Seeds were transferred from high and low temperatures to 15�C to determine whether high or low temperatures induced dormancy. Low temperatures tended not to affect subsequent germination but high temperature decreased subsequent germination for some species. Wetting and drying stimulated the germination of Acacia blakelyi, A. pulchella and Kennedia prostrata seeds.

Seed ageing of four Western Australian species in relation to storage environment and seed antioxidant activity

2003 ◽  
Vol 13 (2) ◽  
pp. 155-165 ◽  
Author(s):  
D.J. Merritt ◽  
T. Senaratna ◽  
D.H. Touchell ◽  
K.W. Dixon ◽  
K. Sivasithamparam
Keyword(s):  
Antioxidant Activity ◽  
Seed Germination ◽  
Relative Humidity ◽  
Western Australia ◽  
Seed Viability ◽  
Seedling Vigour ◽  
Australian Species ◽  
Seed Ageing ◽  
Western Australian ◽  
Water Contents

AbstractThe influence of the storage environment on seed viability and antioxidant potential was examined for four species native to Western Australia: Acacia bivenosa DC., Anigozanthos manglesii D. Don, Banksia ashbyi E.G. Baker, and Mesomelaena tetragona (R. Br.) Benth. Seeds were stored at four water contents (at c. 5%, 11–15%, 20–23% and 50% relative humidity) at each of five temperatures (–196, –18, 5, 23 and 50°C), and seed germination and seedling vigour monitored over an 18-month period. Deterioration was apparent in all species (except A. bivenosa) stored at 50°C, with 11% RH maximizing longevity for B. ashbyi and M. tetragona seeds, and 5% or 11% RH preventing deterioration for A. manglesii seeds. Seed viability generally remained high for all species stored at 23°C or less. Notably, however, germination and seedling vigour of A. manglesii and M. tetragona seeds gradually declined when stored at –18°C, suggesting that storage at this temperature was detrimental. The antioxidant activity of lipid extracts of seeds after 18 months storage at 5, 23 and 50°C was also examined to determine whether the seed viability decline was associated with a loss of antioxidants. Antioxidant activity varied between storage treatments and was not related to seed viability.

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