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Salinity is one of the environmental factors that has a critical influence on the germination of seeds and plant establishment. Salinity affects imbibition, germination and root elongation. However, the way in which NaCl exerts its influence on these vital processes, whether it is through an osmotic effect or a specific ion toxicity, is still not resolved. The objective of this study was to compare the salinity tolerance of two varieties of red clover (Select 2 and Rotrif) and two varietis of alfalfa (Mihaela and MAƒdAƒlina). In our study we used five salinity treatments 0 (control) (C1), 50 (C1), 100 (C2), 150 (C3) and 300mM NaCl (C4) on normal seeds and seeds inoculated with rhizobia. 100 seeds of each variety used in the study were grown in germinating dishes on filter papers with four replications. The results showed that by increasing of the salinity level, germinated seeds number, root, shoot and seedling length, mean daily germination (MDG) and seedling length vigor index (SLVI) decreased, while daily germination speed (DGS) increased in all studied varieties. Mean germination time increased with increasing NaCl level. As the salt concentration increased, germination percentage decreased in all varieties, moreover, seeds could not germinate in 300 mM NaCl, but the seeds who were bacterized germinated in a very small percentage, and the germs were abnormal.

The Effect of Salinity Stress on Seed Germination of Red Clover (Trifolium pratense L.) and Alfalfa (Medicago sativa L.) Varieties