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Determination of cardinal temperature of Euphorbia maculata and its hydrothermal model of germination

Document Type : Original Article

Authors

1 M.Sc Student, Department of Agriculture and Food Industry, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Professor, Department of Agriculture and Food Industry, Science and Research Branch, Islamic Azad University, Tehran, Iran

Abstract

In order to quantify the germination characteristics and determine the cardinal temperature of germination of Euphorbia maculata, seeds were placed at constant temperatures (2- 45 °C). Results showed that seed of E.maculata had no germination at temperatures of 2, 5, 10 and 45 ° C, and the temperature of 30° C was the best temperature for germination seeds (91% Germination percentage). Three models of intersected-line, dent-like segmented and quadratic polynomials were used to estimate the cardinal temperatures. The best model for estimating the cardinal temperatures in E.maculata was intersected-line model with respect to coefficient of determination and mean square error. According to the intersected-line the minimum, optimum and maximum temperatures were calculated 9.8, 28.33 and 43.16 °C. In order to investigate water potential on germination percentage, seeds treated with water potentials (0, -0.2, -0.4, -0.6 and -0.8 MPa) at optimum temperature of 28°C. Baesd on the three-parameter sigmoid method, the value of speed, root length, stem length, seedling fresh weight and dry weight were estimated to be -0.53, -0.48, -0.51, -0.48, -0.52Mpa respectively. According to the hydro-time model based on normal distribution, the hydro-time constant and the base-water potential (which is a threshold for germination beginning) of E.maculata degree were 291.32 (MPa/h) and -1/2 (MPa) at 28 °C, respectively. Thus, this weed species has a great potential for distribution to other areas such as provinces with a dryer climate than Golestan, and the necessary measures to prevent its distribution is necessary.

Keywords

References
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Iranian Journal of Seed Science and Technology
Volume 9, Issue 2 - Serial Number 18
September 2020
Pages 87-100
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