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Asian Journal of Plant Sciences
Year: 2008  |  Volume: 7  |  Issue: 6  |  Page No.: 594 - 598

Comparative Study of Tolerant and Sensitive Cultivars of Brassica napus in Response to Salt Conditions

Homa Mahmoodzadeh    

Abstract: Seed germination and seedling development of Brassica napus cultivars (Okapi and Symbol) under salt stress were evaluated. Germination percentages after treating were variable among different controls and treatments, despite the initial high seed viability for both cultivars. Seeds exposed to high salinity exhibited significantly lower germination than seeds not exposed to NaCl for the same time periods. No significant differences in germination percentages were observed for exposure to 0, 3 and 6 dS m-1 treatments. Seeds of symbol exposed to 12 dS m-1 treatment showed lower germination percentage than the others. Results showed that the percentage and rate of seed germination, seedling growth and distance between the root hairs and root tips were all decreased by salt solutions, especially by 12 dS m-1 treatment. However, these parameters were increased by 3 dS m-1 treatment. Also, being treated with salt solutions, within the range of 12-20 dS m-1, the threshold concentration for germination was determined as 14 dS m-1 for Okapi and 13 ds m-1 for Symbol. Results showed that the effects of salinity stress on the phase of germination is less than the other phases. Under greenhouse condition, the vegetative growth and yield of both cultivars were unaffected by soil salinity of a rate of up to 3 dS m-1. By increasing the salinity levels above the threshold, the ratio of fresh to dry biomass, thickness of leaves, plastochronic period, thickness of pollen exine and 1000-siliqua weight increase. On the other hand, number of leaves, branches, flowers, flower primordia, siliquas and their length, number of seeds per siliqua and 1000-seed weight all decreased. The most inhibitory effect was observed in 12 dS m-1 treatment with more effect on Symbol than on Okapi. The length of siliquas, plastochronic period and number of flowers were more affected by salinity stress than the other parameters.

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