University of Guilan Iranian Journal of Seed Sciences and Research 2476-3780 6 3 2019 09 23 Study on seed dormancy breakage treatments and some germination properties of Colchicum kotschyi Boiss. as a medicinal plant Study on seed dormancy breakage treatments and some germination properties of Colchicum kotschyi Boiss. as a medicinal plant 399 410 3836 10.22124/jms.2019.3836 FA Homa Azizi PhD student in Crop Ecology, College of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran Parviz Rezvani Moghaddam Professor, Department of Agronomy, College of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran Mahdi Parsa Associate Professor, Department of Agronomy, College of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran Mahmood Shoor Associate Professor, Department of Horticulture, College of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran Reza Khorasani Associate Professor, Department of Soil Science, College of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran Journal Article 2020 01 12 In order to evaluate germination behavior of <em>Colchicum</em> seed, an experiment was conducted as factorial based on a randomized complete design with four replications. The experimental treatments were all combination of priming at three levels (warm stratification, cold stratification, control), gibberellic acid at two levels (0,500 ppm) and incubation temperatures at 8 levels (2, 5, 10, 15, 20, 25, 30, 35). After applying the priming treatments, gibberellic acid treatment was applied and then the response of seed germination at constant temperatures were assessed in the germinator. The effect of temperature on germination components was significant. Germination was occurred only in warm stratification. Generally, germination was started by a very slow trend and after seeds were set at incubation temperatures, at least 40 days were lasted to germination occurred. There was no germination at 2°C. By increasing temperature at a range of 5-15°C, germination percentage was increased and then was stopped at 25°C. Germination uniformity at 20°C was more than other temperatures. The meanest germination time was observed at 20°C and the least mean germination time was at 15°C. Gibberellic acid (single application) had no effect on seed germination. Based on two regression models, the cardinal temperatures (T_base, T_opt, T_max) were (1.38-1.72°C), (12.75-16.10°C) and (24.12-25.65°C), respectively. In order to evaluate germination behavior of <em>Colchicum</em> seed, an experiment was conducted as factorial based on a randomized complete design with four replications. The experimental treatments were all combination of priming at three levels (warm stratification, cold stratification, control), gibberellic acid at two levels (0,500 ppm) and incubation temperatures at 8 levels (2, 5, 10, 15, 20, 25, 30, 35). After applying the priming treatments, gibberellic acid treatment was applied and then the response of seed germination at constant temperatures were assessed in the germinator. The effect of temperature on germination components was significant. Germination was occurred only in warm stratification. Generally, germination was started by a very slow trend and after seeds were set at incubation temperatures, at least 40 days were lasted to germination occurred. There was no germination at 2°C. By increasing temperature at a range of 5-15°C, germination percentage was increased and then was stopped at 25°C. Germination uniformity at 20°C was more than other temperatures. The meanest germination time was observed at 20°C and the least mean germination time was at 15°C. Gibberellic acid (single application) had no effect on seed germination. Based on two regression models, the cardinal temperatures (T_base, T_opt, T_max) were (1.38-1.72°C), (12.75-16.10°C) and (24.12-25.65°C), respectively. https://jms.guilan.ac.ir/article_3836_6890e0a612b291f21b4ab1c7c2159165.pdf