Full TGIF Record # 176653
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Publication Type:
i
Report
Author(s):Sakanoue, S.
Author Affiliation:Current: Intensive Grazing Research Team, National Agricultural Research Center, Hokkaido Region, National Agriculture and Food Research Organization, Toyohira, Sapporo; Former: Miyota Research Station, National Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization, Miyota, Kita-saku, Nagano, Japan
Title:Use of a simple distribution function to estimate germination rates and thermal time requirements for seed germination in cool-season herbage species
Source:Seed Science and Technology. Vol. 38, No. 3, October 2010, p. 612-623.
# of Pages:12
Publishing Information:Zurich: International Seed Testing Association
Related Web URL:http://www.ingentaconnect.com/content/ista/sst/2010/00000038/00000003/art00009
    Last checked: 02/28/2011
    Notes: Abstract only
Keywords:TIC Keywords: Cultivar variation; Distribution (statistics); Growth analysis; Growth rate; Seed germination; Temperature response
Abstract/Contents:"An exponential distribution with a lag phase was considered for the concise and practical estimation of germination rates in the determination of the base temperature and thermal time required for seed germination. The germination time courses of nine herbage species (Italian ryegrass, perennial ryegrass, timothy, cocksfoot, tall fescue, Kentucky bluegrass, red clover, white clover, and lucerne) were examined at seven constant temperatures (5, 10, 15, 20, 25, 30, and 35°C), and then used for the nonlinear fitting of this distribution to estimate the mean and median durations until seed germination. The distribution showed excellent goodness of fit to the observed germination time course for any combination of herbage species and temperatures (root mean square of residuals, RMSR ≤ 0.0903). Two germination rates as the reciprocals of the estimated mean and median durations, which are denoted by Vμ and Vm, were linearly regressed with respect to temperature to determine the base temperature and thermal time. The linear regression showed excellent goodness of fit in all examined herbage species (correlation coefficient, r > 0.975). The ranges of base temperatures and thermal times in the examined herbage species were from 0.234 to 4.48°C and from 14.9 to 176 degree days calculated using Vμ , and from 0.191 to 4.26°C and from 13.6 to 152 degree days calculated using Vm , respectively. The results differed little from those of existing studies on the thermal time for the seed germination of cool-season herbage species, indicating that the exponential distribution with a lag phase is useful for the estimation of seed germination rate."
Language:English
References:40
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Sakanoue, S. 2010. Use of a simple distribution function to estimate germination rates and thermal time requirements for seed germination in cool-season herbage species. Seed Sci. Technol. 38(3):p. 612-623.
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