TY - JOUR JF - yu-isr JO - Iranian J. Seed Res. VL - 2 IS - 2 PY - 2016 Y1 - 2016/2/01 TI - Germination Model for Arizona Cypress (Cupressus arizonica) in Response to Temperature and Drought Stress TT - مدل جوانه‌زنی بذر سرونقره‌ای (Cupressus arizonica) در پاسخ به تنش‌های دمایی و خشکی N2 - Select the appropriate tree species and compatible with harsh environmental conditions, with a high survival rate and optimal growth, is very important in the principled forestation projects. Offering moisture - temperature - time seed germination model is one of the solutions to the prediction of seed germination patterns as in this study, germination behavior model in four replications of 50 seeds of Cupressus arizonica (dishes 11cm) on the incubator was examined by applying five levels of water stress (0, -0.5, -1, -1.5, -2 MPa) and temperature treatments (10, 15, 20, 25, 30 °C). The results showed that the optimum temperature (To) and the basic temperature (Tb) for germination is 19.23±0.5 and 6.54 ± 0.0 °C respectively, and amount of the hydro time constant (θH) for this species is 0.29±0.11. According to the results, temperature and water potential factors and their interaction affected significantly on time and percent germination. Value of the hydrothermal time model was determined by using θHT= [(Ψ-Ψb (g)) (T-Tb)] tough model that its rate was 126.3 MPa°C. d with 0.87 coefficients of determination. SP - 113 EP - 121 AU - Aliyari, Fatemeh AU - Soltani, Ali AU - Zarafshar, Mehrdad AD - Department of Natural Resources, Allameh Mohaddes Nouri University, Nour, Iran KW - Water stress KW - Germination KW - Temperature KW - Cupressus arizonica KW - Hydrothermal time UR - http://yujs.yu.ac.ir/jisr/article-1-97-en.html DO - 10.29252/yujs.2.2.113 ER -