Among the various abiotic stresses limiting the crop production, salinity stress is the most important problem, which needs to be addressed and answered straight away. A pot experiment was carried out with rapeseed breeding lines in order to study the effects of salinity stress on phenological traits, plant height and seed yield of rapeseed. A factorial experiment was applied for evaluating the eight rapeseed genotypes under three salinity levels including 0, 6 and 12 dS m-1 taking NaCl:CaCl2 in the ratio of 1:1, which were equal to 42.8 mM and 85.7 mM, respectively. The results of analysis of the variance revealed significant variations among different salinity levels, genotypes and interaction effects of salinity levels × genotypes for days to flowering, days to end of flowering, days to maturity, plant height and seed yield. Due to increasing salinity levels, days to flowering, days to end of flowering and days to maturity were shortened. Although with increasing salinity levels plant height and seed yield of the genotypes were decreased but the ranks of genotypes were different in 0, 6 and 12 dS m-1 salinity levels. The genotypes had significant genetic differences for the traits and the increments of differences also were decreased due to increasing salinity levels. The genotypes had high amount of genetic coefficient variation for days to flowering and seed yield, therefore the efficiency of selection of these two traits will be high. The genotypes including KRN1, LRT1 and Hyola401 with high amounts of seed yield in all salinity levels were considered as tolerant genotypes.
Abbaszadeh F., Rameeh V., Charati A., 2012. Salinity Stress Indices of Seed Yield and Nutrient Compositions in Rapeseed. International Journal of Biology, 4(1): 154-162.
Ajmal Khan M., Weber D.J., 2006. Ecophysiology of high salinity Tolerant plants. Springer, The Netherlands, pp. 11-30.
Ashraf M., McNeilly T., 2004. Salinity tolerance in brassica oilseeds. Critical Reviews in Plant Sciences, 23(2): 157-174.
Bandeh-Hagh A., Toorchi M., Mohammadi M., 2008. Growth and osmotic adjustment of canola genotypes in response to salinity. Journal of Food, Agriculture and Environment, 6(2): 201-208.
Bybordi A., 2010. Effects of salinity on yield and component characters in canola (Brassica napus L.) cultivars. Notulae Scientia Biologicae, 2(1): 81-83.
Francois L. E., 1996. Salinity effects on four sunflower hybrids. Agronomy Journal, 88: 215-219.
Gomez K.A., Gomez A.A., 1984. Statistical procedures for agricultural research; John Wiley and Sons, New York.
Gorham J., 1993. Genetics and physiology of enhanced K/Na discrimination. In Genetic aspects of plant mineral nutrition. Randall P., Ed.; Kluwer Academic Publishers, Dordrecht,The Netherlands. pp: 151-159.
Greenway H., Munns R., 1980. Mechanisms of salt tolerance in no halophytes. Annual Review of Plant Physiology, 31: 149-190.
Grieve C.M., Francois L.E., Maas E.V., 1994. Salinity affects the timing of phasic development in spring wheat. Crop Science, 34: 1544-1549.
Islam M.R., Bhuiyan M.A.R., Prasad B., Quddus M.A., 2001. Salinity effect on yield and component characters in rapeseed and mustard varieties. Journal of Biological Sciences, 1(9): 840-842.
Mahmoodzadeh H., 2008. Comparative study of tolerant and sensitive cultivars of Brassica napus in response to salt conditions. Asian Journal of Plant Sciences, 7(6): 594-598.
Maas E.V., Grieve C.M., 1990. Spike and leaf development in salt-stressed wheat. Crop Science, 30: 1309-1313.
Minhas P.S., Sharam D.R., Khosla B.K., 1990. Effect of alleviation of salinity stress at different growth stages of Indian mustard (Brassica juncea). Indian Journal of Agricultural Sciences, 60(5): 343-346.
Munns R., Termaat A.,1986. Whole-plant responses to salinity. Australian Journal of Plant Physiology, 13: l43-l60.
Neumann P.M., 1995. Inhibition of root growth by salinity stress: Toxicity or an adaptive biophysical response, pp: 299-304. [In:] Baluska, F., Ciamporova, M., Gasparikova, O., Barlow, P.W. (Eds.). Structure and Function of Roots. The Netherlands: Kluwer Academic Publishers.
Purty R.S., Kumar G., Singla-Pareek L.S., Pareek A., 2008. Towards salinity tolerance in Brassica: an overview. Physiology and Molecular Biology of Plants, 14(1): 39-49.
Rawson H.M., 1986. Gas exchange and growth in wheat and barley grown in salt. Australian Journal of Plant Physiology, 13: 475-489.
Volkamar K.M., Hu Y., Steppuhn H., 1998. Physiological responses of plants to salinity: A review. Canadian Journal of Plant Science, 78: 19-27.
Zamani Z., Nezami M.T., Habibi D., Khorshidi M.B., 2010. Effect of quantitative and qualitative performance of four canola cultivars (Brassica napus L.) to salinity conditions. Advances in Environmental Biology, 4(3): 422-427.