Comparison tolerance of two-cultivars greenhouse cucumber germination to salinity stress

Salinity has a critical role in the reduction growth and yield of crops, especially in arid and semiarid regions. Many processes of plant growth such as germination affect by salinity. In order to study the effects of salinitystress on parameters of cucumber germination, a completely randomized experiment with salt (۰, ۵۰, and ۱۰۰ mM NaCl) and cultivar factors (Keyhan, Storm) was designed with six replications. After placing ۱۵ seeds in each Petri dish and treating with saline water, they were incubated in the germinator for ۱۰ days with ۲۵±۲ ᵒC temperature and humidity of ۳۰%. The result of analysis indicated a significant effect of genotype on all character measured under salt stress. The percentage and rate of germination, fresh and dry weight of roots and shoots, and the length of roots and shoots significantly reduced in two cultivars under salt stress. The most negative influence of salt was detected in ۱۰۰ mM NaCl. In response to salt, the germination percentage of Storm cultivar reduced about ۶% with compare to Keyhan cultivar. Moreover, the length of shoots and roots in Storm cultivar decreased about ۵۰ and ۲۵% compared with Keyhan cultivar under NaCl stress. The analysis of data showed an increase in catalase activity, proline content, and lipid peroxidation of two cultivars under salt stress. Furthermore, the activity of catalase and proline was higher in Keyhan cultivar under salt stress. However, lipid peroxidation in Keyhan cultivar was less than Keyhan. Therefore, It seems that Keyhan cultivar tolerate to salinity stress.

کلیدواژه ها:

Keyhan ، Storm ، Catalase ، proline ، NaCl