Abulhashem, M., Aminmajudar, N., Hamid, A., and Hossain, M. 1998. Drought stress on seed yield attributes growth, cell membrane stability and gus change of synthesized Brassica napus. Agronomy Journal 180: 129-136. Amjad Ali, M., Abbas, A., Niaz, S., Zulkiffal, M., and Ali S. 2009. Morpho-physiological criteria for drought tolerance in sorghum (Sorghum bicolor) at seedling and post-anthesis Ssages. International Journal of Agricultural Biotechnology 11: 674-680. Anonymous 2013. FAO Data Based [online]. Available at: http://faostat.fao.org. Ariy, J. M. 1986. Corn and Corn Improvement. Academic Press Inc., New York, USA. 721 pp. Bouslama, M., and Schapaugh, W. T. 1984. Stress tolerance in soybeans. Evaluation of three screening techniques for heat and drought tolerance. Crop Science 24: 933-937. Chassemi, F. 1995. Stalinization of land and water resources. PhD Thesis, University of New South Wales, Australia. Choukan, R., Taherkhani, T., Channadha, M. R., and Khodarahmi, M. 2006. Evaluation of drought tolerance in grain maize inbred lines usines drought tolerance indices. Iranian Journal of Agricaltural Sciences 8(1): 79-89 (in Persian). Clarke, J. M., and McCaig, T. N. 1982. Evaluation of techniques for screening for drought resistance in wheat. Crop Science 22: 503-506. Eberhart, S. A., and Russell, W. A. 1966 . Stability paramenters for comparing variaties. Crop Science 6: 36-40. Ehdaei, B. 2004. Plant Breeding. Shahid Chamran University Press, Ahvaz, Iran (in Persian). Farshadfar, E. A., Zamani, M. R., Matlabi, M., and Emam-jome, E. E. 2001. Selection for drought resistance chick pea lines. Iranian Journal of Agricaltural Sciences 32(1): 65-77 (in Persian). Fernandez, G. C. 1992 . Effective selection criteria for assessing plant stress tolerance. In: Kuo, C. G. (ed.) Proceedings of the International Symposium on Adaptation of Vegetables and other Food Croops in Temperature and Water Stress AVRDC, Publication, Shanbua, Taiwan. Ferrari, E., and Fernandez, J. M. 1986. Genetic variability in sunflower and soybean under drought. 1. Yield relationships. Australian Journal of Agricultural Research 37: 573-583. Fischer, R. A., and Maurer, R. 1978. Drought resistance in spring wheat cultivars. Part1: Grain yield response. Australian Journal of Agricultural Research 29: 897-912. Gavazzi, P., Rizza, F., Palumbo, M., Campaline, R. G., Ricciardi, G. L., and Borghi, B. 1997. Evaluation of field and laboratory predictors of drought and heat tolerance in winter cereals. Canadian Journal of Plant Science 77: 523-531. Hussman, B., Obilana, A., Blum, A., Ayiecho, P., and Schipperack, W. 1998. Hybrid performance of sorghum and its relationship to morphological and physiological traits under variable drought stress. Plant Breeding 117: 223-229. Kardovani, P. 1997. Arid Zone (Vol.1). University of Tehran Publications, Tehran, Iran (in Persian). Mazaherilaghab, H., Nori, F., Zare- Abyane, H., and Vafaei, H. 2001. Effect of final irrigation on important traits of three varieties of sunflower in dry land farming. Iranian Journal of Agricultural Research 1: 41-44 (in Persian). Mitra, J. 2001. Genetics and genetic improvement of drought resistance in crop plants. Current Science 80: 758-763. Moghaddam, A., and Hadizade, M. H. 2002. Response of corn (Zea mays L.) hybrids and their parental lines to drought using different stress tolerance indices. Seed and Plant 18(3): 255-272 (in Persian). Mozafari, K., Arshi, Y., and Zynali – Khanegha, H. 1996. Effect of drought stress on some morphological traits and yield componenets of sunflower. Seed and Plant 12(4): 24-32 (in Persian). Naderi, A., Majidi-Hervan, E., Hashemi-Dezfoli, A., Rezaei, A., and Nourmohammadi, G. 2000. Efficiency analysis of indices for tolerance to environmental stresses in field crops and introduction of a new index. Seed and Plant 15(4): 390-402 (in Persian). Narshima Rao, C. L., and Shivraj, A. 1998. Effect of water stress on grain growth of glossy and non glossy varieties of grain sorghum. Indian Journal of Agricultural Science 58: 770-773. Nour-Mohamadi, G., Siadat, A., and Kashni, A. 2007. Agronomy (Cereal Crops). Shahid Chamran University Press, Ahvaz, Iran (in Persian). Olufayo, A., Ruelle, P., Buldy, C., and Aidaou, A. 1997. Biomass of sorghum under variable water regime. Biomass and Bioenergy 12: 383-387. Rahnema, A. 2003. Evaluation of drought stress in different stages of growth and its effect on yield, yield components and qualitative traits of corn in Karaj area. MSc. Thesis, College of Agriculture, University of Tehran, Karaj, Iran (in Persian). Roshdi, M., and Rezadost, S. 2005. Study of different irrigation levels on qualitative and quantities traits of sunflower. Iranian Journal of Agricultural Sciences and Natural Resource 46 (5): 1241-1250 (in Persian). Rosielle, A. T., and Hamblin, J. 1981. Theoretical aspects of selection for yield in stress and non-stress environment. Crop Science 21: 943-945. Shafazadeh, M. K., Yazdansepas, A., Amini, A., and Ghannadha, M. R. 2004. Study of terminal drought tolerance in promising winter and facultative wheat genotypes using stress susceptibility and tolerance indices. Seed and Plant 20 (1): 57-71 (in Persian). Yadav, R. S., Hash, C. T., Bidinger, F. R., and Howarth, C. J. 1999. Identification and utilization of quantitative trait loci to improve terminal drought tolerance in pearl millet (Pennisetum glaucum L.). CIMMYT Workshop on Molecular Approaches for the Genetic Improvement of Cereals for Stable Production in Water – Limited Environments. CIMMYT, Mexico, D. F., Mexico.