Sahar Binesh; Gholam abbas Akbari; Elias Soltani; Fatmeh Amini
Abstract
In order to examine the germination response of basil medicinal plant’s seeds (Ocimum basilicum L.) to temperature and determination of cardinal temperatures for germination percentage and rate, a compound decomposition experiment was performed through a fully random design with four reptile and ...
Read More
In order to examine the germination response of basil medicinal plant’s seeds (Ocimum basilicum L.) to temperature and determination of cardinal temperatures for germination percentage and rate, a compound decomposition experiment was performed through a fully random design with four reptile and six thermal levels (8, 15, 20, 25, 30, and 35 degree centigrade) in seed technology laboratory of Abou-Reyhan campus in Univerity of Tehran. In this study, 22 Basil masses were evaluated including “Tehran”, Green Shahr-e-Rey”, “Green Birjand”, “Purple Birjand”, “Green Shiraz”, “Green Zabol”, “Zahedan”, “Green Zahedan”, “Kermanshah”, “Green Pishva”, “Purple Pishva”, “Green Malayer”, “Khash”, “Local green Tonekabon”, “Green Isfahan II”, “Purple Isfahan II”, “Green Isfahan III”, “Green Isfahan IV”, “Green Mash’had”, “American green Napolta”, “Italian Genovese”, and “Switzerland” . Based on the results of variance analysis, temperature impact, genotype, and their interaction on germination percent and germination rate was significant at the 5% level. Optimal range of temperature for germination percent and germination rate was obtained as 19.10-27.78 and 20.32-29.89 degrees centigrade, respectively. In most masses, the highest germination rate was observed at 25 degrees centigrade. Among all evaluated masses in current research, Isfahan III was appropriated the highest germination rate in all temperatures. The results of experiment showed that the response of germination percentage and germination rate to temperature was well described through Beta function and segmented function, respectively, and cardinal temperatures can be determined for Basil using these two models.
Behnam Kamkar; Ommolbanin Gorzin; nafiseh khalili; mohammadhosein ghorbani
Abstract
Almolookhiyeh (Corchorus olitorius L.) known in the world as a valuable medicinal plant that was produced for the first time in Iran in 2011. This study was aimed to quantify germination response of Almolookhiyeh to temperature. For this purpose, seeds were exposed to different constant temperatures ...
Read More
Almolookhiyeh (Corchorus olitorius L.) known in the world as a valuable medicinal plant that was produced for the first time in Iran in 2011. This study was aimed to quantify germination response of Almolookhiyeh to temperature. For this purpose, seeds were exposed to different constant temperatures (10 ,15, 20, 25, 30, 35, 40, 45 and 50°C) in Seed Research Lab, Gorgan University of Agricultural Sciences and Natural Resources in 2011. Results showed that the effect of temperature on the maximum germination percentage (MGP), germination rate (R50), germination uniformity (GU), and time to 10, 50 and 90 percent germination as (D10), (D50) and (D90), the percentage of normal seedlings (NS%) and seedling length (LS) was highly significant. Assessment of three nonlinear regression models including segmented, dent-like and beta models based on 10, 50 and 90 percent germination revealed that beta model was superior to other models. Based on the superior model (Beta), base, optimum and ceiling temperatures were estimated as 10.18, 37.31 and 50°C, respectively. Biological hours also were calculated as 13.56 hours. Using beta model to regress seedling length against temperature and normal seedling percentage versus temperature showed that seedling emergence, the maximum seedling length and the highest normal seedling percentage were occurred at 11 to 44, 35.34 and 31°C, respectively.
amirhasan khodabakhshi; Behnam Kamkar; nafiseh khalili
Abstract
This study was conducted to quantify germination response of annual savory (Satureja hortensis L.) to temperature and water potential. For this purpose, seeds were exposed to different temperature (12, 15, 20, 25, 30, 35, 37 and 40°C) and water potential (zero, -0.1, -0.3, -0.5 and -0.7 MPa) treatments ...
Read More
This study was conducted to quantify germination response of annual savory (Satureja hortensis L.) to temperature and water potential. For this purpose, seeds were exposed to different temperature (12, 15, 20, 25, 30, 35, 37 and 40°C) and water potential (zero, -0.1, -0.3, -0.5 and -0.7 MPa) treatments in Seed Research Lab., Gorgan University of Agricultural Sciences and Natural Resources in 2013. Results indicated that temperature and water potential and interacted effects had significant effect on maximum germination percentage, germination rate (reciprocal time to 50 percent germination), and time to 10, 50 and 90 percent germination. Along with water potential decrement, both germination percentage and rate decreased. With temperature increasing to optimum temperature, both germination percentage and rate increased, while it decreased from optimum temperature onward. Assessment of three nonlinear regression models including segmented, dent-like and beta models revealed that the last one was selected as the superior model. Based on the superior model (Beta), base, optimum and ceiling temperatures were estimated as 7.56, 23.98 and 40°C, respectively. Biological hours for control treatment (zero potential water) was calculated as 91.17 hours. Cardinal temperatures were not affected by water potential, but biological hours for germination was delayed as 17.64 hours per each unit water potential increment.