Determination of temperature-related parameters and response ranges of Almolookhiyeh seeds and seedlings using nonlinear regression

Kamkar, Behnam; Gorzin, Ommolbanin; Khalili, Nafiseh; Ghorbani, Mohammadhosein

doi:10.22059/jci.2015.54799

Document Type : Research Paper

Authors

¹ . Associate Professor, Department of Agronomy, Faculty of Plant Production, Gorgan University of Agricualtural Sciences and Natural Resources, Gorgan, Iran

² M.Sc. Student, Department of Agronomy and Crop Breeding, Faculty of Agriculture, University of Shahrood, Shahrood, Iran

³ Graduated M.Sc., Department of Agronomy, Faculty of Plant Production, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

⁴ Instructor, Department of Agronomy, Faculty of Plant Production, Gorgan University of Agricualtural Sciences and Natural Resources, Gorgan, Iran

https://doi.org/10.22059/jci.2015.54799

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 (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.

Keywords

20.1001.1.83372008.1394.17.1.16.8

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Journal of Crops Improvement

Determination of temperature-related parameters and response ranges of Almolookhiyeh seeds and seedlings using nonlinear regression

References

References

Volume 17, Issue 1 - Serial Number 1
April 2015
Pages 217-228

Determination of temperature-related parameters and response ranges of Almolookhiyeh seeds and seedlings using nonlinear regression

References

References

Volume 17, Issue 1 - Serial Number 1April 2015Pages 217-228

Volume 17, Issue 1 - Serial Number 1
April 2015
Pages 217-228