Estimation of Cardinal Temperatures and Thermal Time Requirement for Bromusjaponicus Seed Germination
Author(s):
Abstract:
To quantify the seed germination of Bromus japonicas Thunb to temperature and to estimate cardinal temperature and thermal time, an experiment was conducted in 2014 at Research Institute of Biotechnology of Gorgan University. Eight constant temperature regimes consisted of 3, 5, 10, 15, 20, 25, 30 and 35˚C. Four non- linear regression models [two segment, beta (4 and 5 parameters) and dent-like] were used to describe germination rate-temperature relationship for B. japonicus. Two different statistic indices (Root Mean of squares of Error (RMSE) and Akaike Information Critorion (AICc) were used to compare the model performances. The results showed that, in response to temperature, the segmented model ear estimate germinat rate better than the other models. The base, optimum and the upper limit of temperatures were 0.66, 10.6 and 44.58 oC respectively. The thermal time to reach 50 and 95% seed germination was 22.4 and 45.57 degree-days, respectively. Knowledge of ecological parameters for quantifying behavior of a weed in response to different climates ear be useful.
Keywords:
Language:
Persian
Published:
Weed Research Journal, Volume:8 Issue: 1, 2016
Pages:
13 to 26
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