Document Type : Research Paper
Authors
1 Assistance Professor, Department of Agriculture, Payame Noor University
2 Professor, Faculty of Agriculture, Shahid Chamran University of Ahvaz
3 Associate professor, Faculty of Agriculture, Shahid Chamran University of Ahvaz
Abstract
Abiotic stresses, like salinity, cause an increase in nitrogen compounds such as proline and soluble proteins in plant. In order to investigate the role of these compounds in salt tolerance, an experiment was conducted in controlled manner, under hydroponic conditions at college of Agriculture, Shahid Chamran University of Ahvaz, Iran. This experiment was carried out in Completely Randomized Design as split plots with three replications in 2011. Salinity in three levels includes 0, 100 and 150 mM NaCl as main plots and the subplots composed of three rapeseed genotypes including MHA4921, MHA4026 and Hyola401. Salinity caused a significant reduction in root and shoot biomass and shoot No3-. Results showed that an increasing in salinity leads to increase in proline and soluble proteins contents of all genotypes, but this increase was greater in MHA4026(salt sensitive genotype) than in two other (salt tolerant) genotypes, at highest level of salinity. Soluble sugar content in shoots, increased with increasing NaCl in three genotypes, but this variation was greater in salt tolerant genotypes. Soluble sugar shoot/root ratio was greater in MHA4921 and Hyola 401, but different between Hyola401 and MHA4026 was non significant. The results showed that proline accumulation under salt stress seems to be a symptom of injury amount rather than an indicator of salt tolerance.
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