Cardinal Temperatures and Thermal Time for Seed Germination of Brunonia australis (Goodeniaceae) and Calandrinia sp (Portulacaceae)

Cave, Robyn L., Birch, Colin J., Hammer, Graeme L., Erwin, John E. and Johnston, Margaret E. (2011) Cardinal Temperatures and Thermal Time for Seed Germination of Brunonia australis (Goodeniaceae) and Calandrinia sp (Portulacaceae). HortScience, 46 5: 753-758.

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Author Cave, Robyn L.
Birch, Colin J.
Hammer, Graeme L.
Erwin, John E.
Johnston, Margaret E.
Title Cardinal Temperatures and Thermal Time for Seed Germination of Brunonia australis (Goodeniaceae) and Calandrinia sp (Portulacaceae)
Formatted title
Cardinal Temperatures and Thermal Time for Seed Germination of Brunonia australis (Goodeniaceae) and Calandrinia sp (Portulacaceae)
Journal name HortScience   Check publisher's open access policy
ISSN 0018-5345
Publication date 2011-05
Sub-type Article (original research)
Volume 46
Issue 5
Start page 753
End page 758
Total pages 6
Place of publication Alexandria, VA, United States
Publisher American Society for Horticultural Science
Collection year 2012
Language eng
Formatted abstract
Seed germination of Brunonia australis Sm. ex R.Br. and Calandrinia sp. (Mt. Clere: not yet fully classified) was investigated using a thermogradient plate set at different constant temperatures to determine seed propagation requirements of these potential floriculture species. Germination responses were tested at 3, 7, 11, 15, 18, 22, 25, 29, 34, and 38 degrees C. Germination data were modeled using the cumulative distribution function of the inverse normal, which provides information on lag, rate, and maximum seed germination for each temperature regime. To determine cardinal temperatures, the reciprocal time to median germination (1/t(50)) and percentage germination per day were calculated and regressed against temperature. Base temperature estimates for B. australis were 4.9 and 5.5 degrees C and optimum temperatures were 21.4 and 21.9 degrees C, whereas maximum temperatures were 35.9 and 103.5 degrees C, with the latter being clearly over-estimated using the 1/t(50) index. Base temperatures for Calandrinia sp. were 5.8 and 7.9 degrees C, whereas optimum and maximum temperature estimates of 22.5 and 42.7 degrees C, respectively, were reported using the percentage germination per day index. Maximum seed germination of 0.8 to 0.9, expressed as the probability of a seed germinating, occurred at 11 to 25 degrees C for B. australis, whereas maximum germination for Calandrinia sp. was 0.5 to 0.7 at 18 to 25 degrees C. Thermal time, the accumulation of daily mean temperate above a base temperature, was calculated for different germination percentages. Estimates of thermal time (degrees Cd) for 50% seed germination were 54 and 90 degrees Cd for B. australis and Calandrinia sp., respectively.
Keyword Australian native
Floriculture
Seed propagation
Scheduling
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Agriculture and Food Sciences
 
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Created: Fri, 10 Feb 2012, 14:55:11 EST by Professor Graeme Hammer on behalf of School of Agriculture and Food Sciences