Effect of various temperatures on germination behavior of Thymus daenensis (Elam ecotype)

Document Type : Original Article

Abstract

Thymus daenensisis endemic medicinal plant of Iran and belong to Lamiaceae family.In this study germination behavior of Elamecotype of Thymus daenensis subsp. daenensis under various temperatures was studied. Seeds were exposed to nine constant temperatures ranging from 3°C to 40°C. Analysis of variance revealed clear differences in temperature requirements for seed germination in the ecotype. To determine cardinal temperature, Germination rate-temperature relationship was considered. Two regression models; Intersected lines and Plateau were used to describe these relationships.The result was evaluated through regression coefficient (R2) and root mean square error (RMSE). The comparison results showed that the best model was plateau model. The based temperature was predicted 1.4°C, the optimum germination rate were within the ranges of 20°Cto 24.7°C and ceiling temperature 39.68°C in this ecotype.Temperature had a significant effect on germination indices such as coefficient uniformity germination, germination index, daily germination speed, mean germination timemeangermination daily and etc. Result in the present study reveals that Elam ecotype was adapted to lower temperatures in order to avoid summer drought and to benefit winter humidity.

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References

Al Khanjari, S., A. A. Filatenko, K. Hammer and A. Buerkert. 2008. Morphological spike diversity of
Omani wheat. Gen Res Crop Evol. 31: 643-647.
Beuningen, L.T. and Busch. R.H. 1997. Genetic diversity among North American spring wheat cultivars.
Crop Sci. 37:981–988.
Farahani, A., and Arzani. A. 2006. Investigation of genetically differences of wheat varieties using
morphological traits. J. Scie. Technol Agric. Nat Resoor, 10 (4): 341-355.
Golabadi, M., and Arzani, A. 2002.Study of genetical diversity and factor analysis for crop characters in
durum wheat. Journal of Science and Technology of Agric. Nat Resour 7 (1): 115-126.
Kaviani, R., Aghai Sarbaraze, M., Bihamta, M. R., and Mohammadi. M. 2013. Genetic Diversity and
Factor Analysis for Agronomical and Morphological Traits in Durum Wheat Landraces. Seed Plant Breeding
Journal. 29 (1): 4, 673-692.
Lersten, N. R. 1987. Morphology and Anatomy of the wheat plant. 33-75 PP. in: wheat and wheat
improvement. E. G. Hayne, (ed). ASA. CSSA, SSSA. Agronomy monograph, NO. 13.
Matsuo, R.R. 1996. Durum Wheat: its unique pasta-making properties.PP.169-178. In: W. Bushuk and V.
F. Raspre(Eds.), Wheat production, properties and Quality. Chapman and Hall, London.
Naghavi, M., Shahbaz purshabazi., A., and Talei. A. 2003. Study of differentiation of durum germplasm
using some morphological traits. J Crop Sci, 4(2):81-86.
Najafian, G., Jalali kamali, M., and Azimian. J. 2007. Characteristics of wheat new lines and hybrids in
Iran. Journal of Agricultural education, pp 203.
Naroirad, M., Farzanju, M., Ftaiy, H., and Arjomandinezhad. A. 2006. Investigation of genetical
diversity and factor analysis of morphological traits of local wheat varietiesin Sistan Baluchestan. J. Agric
Gardening, 73:50-57.
Irani, P. 1993. Study of quality of durum varieties. (In Persian) Seed Plant J. 9 (3): 12-17.
Iranian Journal of Seed Science and Technology
Volume 3, Issue 1 - Serial Number 5
March 2014
Pages 123-135

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