Document Type : Original Article

Authors

Abstract

In order to evaluate sugar beet seed response to heat stress, a study comprising of three treatments was conducted under laboratory condition based on complete randomized design with four replications in 2015. In the first experiment, seeds of the four cultivars were subjected to different temperatures ranging from -20 to 44°C with 3°C intervals to determine the appropriate maximum temperature. In the second experiment, seed germination of 39 genotypes was evaluated under the optimum temperature of 20°C and also the maximum temperature. Based on existing variation, two sensitive and two tolerant genotypes to high temperature were selected and re-evaluated under optimum and maximum temperature together with their half-sib offspring. In all treatments, seven days after the start of the experiment, different traits such as germination percentage, root length, stem length, vigor index, and root to shoot ratio under both were measured. Based on linear regression between germination percentage and temperature, 30% of the seeds were unable to germinate at 30°C therefore, this temperature was selected as the maximum temperature. In the second experiment, variation was found among genotypes for the abovementioned traits. The results of the third experiment showed high heritability for seed germination under heat stress which confirms that the breeding of this trait can be successful.

Keywords

Agrawal, R. 2003. Seed technology. Pub. Co. PVT. LTD. New Delhi. India.
Ahmed, K., K. Nahar, M. Fujita, and M. Hanuzzaman.2010. Variation in plant growth, tiller dynamics and yield components of wheat (Triticum aestivum L.) due to high temperature stress. Adv. Agric. Bot. 
2: 213-224.
Ansarpour, M., M. F Najaf Abadi, M. Esmailzadeh Moghaddam and H. Ramshini. 2014. Analysis of genetic variance components for heat stress tolerance in wheat. Proc. First Int. Congr. & 13th Iranian Gene. Congr., Thran, Iran. (In Persian).
Bakhshaki, S. 1998.Determination of correlation between yield and its components and some important agronomic traits of bean using path analysis. M. S. Thesis. Univ. Sary. (In Persian).
Beikzadeh, H., S.M.Alavi Siney, M. Bayat,and A.A. Ezady. 2015. Estimation of Genetic Parameters of Effective Agronomical Traits on Yield in some of Iranian Rice Cultivars. Agron. J. (Pajouhesh and Sazandegi) No: 104 pp: 73-78.(In Persian).
Bradford, K. J. 2002. Application of hydrothermal time to quntifying and modeling seed germination and dormancy. Weed Sci., 50: 248-260.
Brar, G.S., J.F. Gomez, B.L.McMichael, A.G.Matches and H.M. Taylor. 1991. Germination of twenty forage. Legumes as influenced by temperature. Agron. J. 83, 173-175.
De Villiers, A. J., M.W.Van Rooyrn, G.K.Theron and H.A.Van Deventer. 1994. Germination of three namaqualand pioneer species, as influenced by salinity, temperature and light. Seed Sci. Technol. 22: 427-433.
Farshadfar, E. 1997. Plant breeding methodology. Published by Razi Uni. P. 616.(In Persian).
Fathi Abd-El-Motagally, F.M. 2004. Evaluation of two sugar beet cultivars (Beta vulgaris L.) for growth and yield under drought and heat condition. Ph.D. Thesis, Inst. of Plant Nutrition Justus Liebig Univ., Giessen, Germany.
Frova, C., P. Portaluppi, M.Villa and M.Sari-Gorla. 1995. Sporophytic and Gametophytic components of thermotolerance affected by pollen selection. J. Heredity 86:50-54.
Hall, A.E., 1992. Breeding for heat tolerance. Plant Breed. Rev. 10, 129–168.
Hall, A.E., 2001. Crop Responses to Environment. CRC Press LLC, Boca Raton, Florida.
Hallauer, A.R., J.C. Marcelo, and J.B. Miranda.2010. Quantitative genetic in maize breeding. Iowa State univ, Press, Ames Iowa.
Hallauer, A.R. and J.B. Miranda. 1988. Quantitative genetics in maize breeding. Iowa State Univ. Press.
International Seed Testing Association. 2009. International Rules for Seed Testing. Zurichtstr.50.CH8303, Bassersdorf, Switzerland, Edition 2009/1.
Jacobsen, S.E. and A.P. Bach. 1998. The influence of temperature on seed germination rate in quinoa (Chenopodium quinoa Willd). Seed Sci. Technol. 26: 515-523.
Jalilean, A., D. Mazaheri, R. Tavakol Afshari, h. Rahimian, M. Abdollahian Noghabi and J. Gohari. 2004. Estimation of base temperature and investigation of germination and field emergence trend of monogerm sugar beet under various temperatures. Sugar beet J. 20:97-112. (In Persian).
Jones, P.D, M.New, D.E. Parker, S. Mortin and I.G.Rigor. 1999. Surface area temperature and its change over the past 150 years. Rev. Geophys. 37, 173–199.
Kebreab, E., and A.J. Murdoch. 2000. The effect of water stress on the temperature range for germination of Orobanches aegyptiaca seeds. Seed Sci. Res. 10: 127-133.
Khodadadi, M., H.Dehghani, and M.H. Fotokian. 2011. Study on heritability, path and factor analysis in winter wheat (Triticum astivum L.) genotypes. J. Agri. 2: 67-78. (In Persian).
Koocheki, A. 1996. Crop production in dry regions. Published by Mashhad Uni. P. 202(In Persian).
Meyer, S.E.,and R.L. Pendleton. 2000. Genetic regulation of seed dormancy in Purshia tridentate (Rosaceae). Ann. Bot. 85: 521-529.
Nguyen, H.T.,and D.A. Sleper. 1983. Theory and application of half-sib matings in forage grass breeding. Theor. Appl. Genet. 64:187-196.
Rajabi, A., M. Moghadam, F.Rahimzadeh Khoeii, M. Mesbah, and Z. Ranzi .2002. Evaluation of genetic diversity of sugar beet populations for quality and agronomic traits. Iran. J Agric. Sci. 33: 553-567. (In Persian, abstract in English).
Ramezani Moghadam, M.R, I. Majidi., H.R Zamanizadeh, S.A. Mohamadi, and M. Azizi. 2006. Study on genetic diversity in diploid cotton (Gossypium. Herbaceum & G.arboreum) using morphological traits. J. Agric. Sci. Islamic Azad Uni. (In Persian).
Ranal MA, and DG.De Santana. 2006.How and why to measure the germination process? Rev. Brasil. Bot. 29(1):1-11.
Salmanieh,h., M.R. Syahpoush and M. Modarresi. 2013. Effect of temperature increase on yield reduction of strategic wheat crop. Proc. First National Meeting on Agric. Polluters & Food Safety, Challenges & Solutions, Ramin Uni., Khuzestan, Iran. (In Persian).
Soltani, E., Akram Ghaderi, F. and Memar, H. 2007. The effect of priming on germinationcomponents and seeding growth of cotton seeds under drought. J. Agric. Sci. Nat. Res. 14(5), 9-16.
Tobe, K., and Li, X. Omasa, 2000. Seed germination and radicle growth of a halophyte, Kalidium capsicum. Ann. Bot. 85: 391-396.