Quantification of temperature effects on germination and induction of secondary dormancy in barley cultivars

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MALEK M.; HAMIDI S.; GHADERI FAR F.; GORZIN M.; PAHLAVANI M.H.; ESMAEILZADEH MOGHADDAM M.

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Journal: Environmental Stresses in Crop Sciences Year:2020 | Volume:13 | Issue:3 Page(s): 995-1007

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Title

Quantification of temperature effects on germination and induction of secondary dormancy in barley cultivars

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Keywords

Germination cardinal temperatureQ1

Germination rateQ1

Temperature sensitivityQ1

ThermodormancyQ2

Thermo-inhibitionQ1

Abstract

This study was conducted to investigate the temperature effects on Germination rate and percentage as well as induction of dormancy in barley cultivars seeds. In this study, seeds of 15 barley cultivars at 5, 10, 15, 20, 25, 30, 35 and 40 ° C were tested to calculate Germination rate and percent with three replications. Germination rate was calculated by fitting the three-parameter logistic model to the cumulative germination data versus time, and finally, the cardinal temperature of the germination was estimated by segmented model. Results showed that there was a significant difference between the cultivars in terms of germination percentage at different temperatures and the highest differences were observed at high temperatures (especially at 35° C). Cardinal temperatures of germination were also different in cultivars. The base temperature varied from 1. 61 to 4. 34 ° C in different cultivars. Also the optimum temperatures in Sahara, Aras and Eram cultivars were 23. 15, 27. 49 and 35. 34 ° C, respectively, and in other cultivars studied between 30-33 ° C. On the other hand, the ceiling temperature was estimated about 40 ° C in all cultivars, which was not significant differences between them. In this study, the reason for lack of germination in barley seeds at high temperatures was also investigated and the results indicated that non-germination at high temperature was partly due to the induction of secondary dormancy and at some extent related to the seed death after being exposed to high temperatures. The germinability and seed deaths respectively increased and decreased exponentially as duration of seed imbibition at high temperatures increased. On the other hand, induction of secondary seed dormancy followed a normal distribution, so that as imbibition duration at high temperatures increased, the capacity for dormancy induction first increased and then decreased.

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APA: Copy

MALEK, M., HAMIDI, S., GHADERI FAR, F., GORZIN, M., PAHLAVANI, M.H., & ESMAEILZADEH MOGHADDAM, M.. (2020). Quantification of temperature effects on germination and induction of secondary dormancy in barley cultivars. ENVIRONMENTAL STRESSES IN CROP SCIENCES, 13(3 ), 995-1007. SID. https://sid.ir/paper/404982/en

Vancouver: Copy

MALEK M., HAMIDI S., GHADERI FAR F., GORZIN M., PAHLAVANI M.H., ESMAEILZADEH MOGHADDAM M.. Quantification of temperature effects on germination and induction of secondary dormancy in barley cultivars. ENVIRONMENTAL STRESSES IN CROP SCIENCES[Internet]. 2020;13(3 ):995-1007. Available from: https://sid.ir/paper/404982/en

IEEE: Copy

M. MALEK, S. HAMIDI, F. GHADERI FAR, M. GORZIN, M.H. PAHLAVANI, and M. ESMAEILZADEH MOGHADDAM, “Quantification of temperature effects on germination and induction of secondary dormancy in barley cultivars,” ENVIRONMENTAL STRESSES IN CROP SCIENCES, vol. 13, no. 3 , pp. 995–1007, 2020, [Online]. Available: https://sid.ir/paper/404982/en

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