Full TGIF Record # 115351
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DOI:10.1016/S0098-8472(99)00004-0
Web URL(s):http://www.sciencedirect.com/science/article/pii/S0098847299000040
    Last checked: 01/31/2014
    Access conditions: Item is within a limited-access website
Publication Type:
i
Refereed
Author(s):Hardegree, S. P.; Van Vactor, S. S.
Author Affiliation:United States Department of Agriculture, Agricultural Research Service, Northwest Watershed Research Center, Boise Idaho
Title:Predicting germination response of four cool-season range grasses to field-variable temperature regimes
Source:Environmental and Experimental Botany. Vol. 41, No. 3, June 1999, p. 209-217.
Publishing Information:Elsevier
# of Pages:9
Keywords:TIC Keywords: Seed germination; Establishment rate; Temperatures; Poa secunda; Pseudoroegneria spicata; Elymus elymoides; Temperature response; Soil temperature; Models
Abstract/Contents:"Germination of non-dormant seeds under variable-temperature conditions can be predicted from constant-temperature germination data if it is assumed that instantaneous germination rate is independent of thermal history. Thermal-response models of this type have not been validated under simulated field-variable temperature conditions that vary in diurnal pattern, diurnal range and longer-term trends in mean-daily temperature. The purpose of this experiment was to evaluate germination response of thickspike wheatgrass (Elymus lanceolatus), bluebunch wheatgrass (Pseudoroegneria spicata), Sandberg bluegrass (Poa sandbergii) and bottlebrush squirreltail (Elymus elymoides) under both constant and field-variable temperature regimes in the laboratory. It was hypothesized that the thermal history assumption was valid and that constant-temperature data could be used to accurately estimate field-variable temperature response. Seeds were germinated at seven constant temperatures between 5 and 35°C, and under 18 variable-temperature regimes simulating six planting dates at three field sites. Predictions of germination time under variable-temperature conditions were accurate to within a fraction of 1 day up to a cumulative germination percentage of 70% for thickspike wheatgrass, 60% for bluebunch wheatgrass, 55% for Sandberg bluegrass and 70% for bottlebrush squirreltail. It was concluded that, for the variable-temperature regimes tested in this experiment, the thermal-history assumption was valid for earlier-germinating subpopulations."
Language:English
References:29
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hardegree, S. P., and S. S. Van Vactor. 1999. Predicting germination response of four cool-season range grasses to field-variable temperature regimes. Environ. Exp. Bot. 41(3):p. 209-217.
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DOI: 10.1016/S0098-8472(99)00004-0
Web URL(s):
http://www.sciencedirect.com/science/article/pii/S0098847299000040
    Last checked: 01/31/2014
    Access conditions: Item is within a limited-access website
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MSU catalog number: QK 711 .A1 R3
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