The effect of accelerated ageing and drought stress on physiological and morphological characteristics of wheat seed in laboratory conditions

Document Type : Original Article

Abstract

Seed deterioration and environmental stresses effects on seed germination are important factors limiting germination percentage (GP) and emergence homogenecity under field conditions. In order to study the effect of deterioration degree and artificial drought stress on wheat seed germination and seedling parameters; a factorial experiment were conducted based on a randomized complete block design with four replications. Treatments were seed deterioration degree (control, 65 and 130 hrs at 100% RH and 41±0.3 °C), cultivars (Shahpasand, Azar2, Shahriar, Alvand and Zarrin) and artificial drought stress applied with PEG6000 (control, -3 and -6 bar). Results showed that 130 hrs deterioration and -3 bar stress had the lowest germination rate (GR) in Azar2, while the lowest GP for this cultivar was observed under 65 hrs deterioration and -6 bar stress conditions. The shortest radical and plumule obtained from Azar2 and Shahriar at 65 hrs stress and -6 bar stress level. With increasing deterioration and stress levels, the seedling dry weight decreased in all cultivars. The greatest seed reservoirs using rate (SRUR) achieved in Shahriar cultivar at control levels of deterioration and stress, while the lowest value in Azar2 at 130 hrs deterioration and -6 bar drought stress. The lowest value for seed reservoir using efficiency (SRUE) was observed at Azar2*control deterioration*control stress, but the lowest value for FMSR at Azar2* 130 hrs deterioration* -6 bar stress. It is concluded that the cultivars are different genetically in seed reservoir consuming at germination and the deterioration level is more important in seed vigor decrease than drought stress. Therefore, parameters studied in this research specially SRUR are useful in screening of cultivars for high seed  vigor

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References

Anonymus. 2002. Seed vigor testing handbook. Association of Official Seed Analysts(AOSA), Lincoln,
NE, USA. (Contribution, 32).
Bewley, J.D. and Black, M. 1994. Seeds. physiology of development and germination. Second
Edition. Plenum Press, N.Y. 445 pages.
Bianco, J., Lassechere, S. and Bulard, C. 1984. Gibberellins in dormant embryos of Pyrus malus L.
CV. Golden delicious, Plant Physiology, Vol, 116. pp: 185-188.
El-Refaey, F. and El-Dengawy, A. 2005. Promotion of seed germination and subsequent seedling
growth of loquat(Eriobotrya japonica ,Lindl) by moist-chilling and GA3 applications, Sciatica Horti.,
Vol, 105. pp: 331-332.
Hurburgh, c .1995. Soybean Drying and Storage. Iowa State University of Science and Technology,
University Extension.
Krzyzanowski, F.C., West, S. H., Francaneto,J. 2006. Drying soybean seed using air ambient
temperature at low relative humidity.RevistaBrasileira De Sements,vol. 28,n 2, p.77-83.
Perez, M. A., M. T. Aiazzi, J. A. Arguello. 1994. Physiology of seed vigor in groundnuts (Arachis
hypogaea L.) in relation to low temperatures and drought Advances en Investigation INTAEstacion
Experimental Agropecuaria Manfredi,1: 13-23.
Pouzet, A., A. Estragant, and J. Raimbault. 1983. Study of relationship between three criteria for
estimation of vigor in winter rape cultivar Jet Neuf: leaf area per plant, diameter at the neck and dry
matter accumulated in aerie parts. 6th International Rapeseed Conference. 149.
Rafiee,S.;Keyhani, A.;Mohammadi, A. 2008. Soybean seed mass transfer simulation during drying
using finite element method.World App. Scie. J. 4(2):284-288.
Randy, N. 2009. Soybean Storage and Drying .University of Minnesota Extension. Clay County. Nelse
1657@umn.edu.
Siddique, A.B. and D. Wright, 2003. Effect of different drying time and temperature on Moisture
percentage and seed quality (viability and vigour) of pea seeds (Pisum sativum L.). Asian J. Plant Sci.,
2: 978-982.
TeKrony, D. M., Egli, D. B., Wickham, D. A. 1989. Corn seed vigor effect on no tillage field
performance. I. field emergence. Crop Sci. 29:1523-1528.
TeKrony, D.M., Egli, D.B. 1977. Relationship between laboratory indices of soybean seed vigor and
field emergence. Crop Sci. 17:573-577.
Iranian Journal of Seed Science and Technology
Volume 2, Issue 2 - Serial Number 4
December 2013
Pages 219-228

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