عبدالعلی حسامی

This study was conducted to investigate the effect of salinity on seed gennination (Ziziphus spina-christiandZ. mauritiana) with a factorial experiment in a randomized complete block design with six replications in2014. The experiment;l factors consisted of four different types of seeds from two genotypes of Z. mauritiqna (round seed and elongated seed) and two different wild genotypes of Ziziphus spina-chrlsti (coarse grain and fine grain) in four levels of soil salinity with an electrical conductivity of 1.8 (control), 5.8, 10.2 and l6.5ds m-r. Over a period of 35 days traits such as days to germination, days to 50o/o germination, final percentage of germination, germination dispersion, maximum value, mean daily germination, uid,germination value, were examined. The results showed that the seeds of the fwo wild genofypes germinated much faster than other ffeatments. The highest percentage of final germination (100%) in both wild genotypes (Ziziphus spina-christi) was af control and 5.8dSm:ltreatment. f,he lowest percentage of final germination rate of elongated, Z. mauritianq seeds was at all three level of salinity (5.8, I0.2, and 16.5dS mr) and round Z. mquritiqna seeds was at 16.5 dS m- '.With increasing soil salinity, the dispersion characteristics of germination and mean number of days to germination was significantly increased but the maximum value and the value of the germination traits were significantly decreased. Survival percentage, length, and number of actual leaves of seedlings were significantly decreased with the increasing of soil salinity. Both Wild genotypes (Ziziphusspina-christi) and two type of Z. mauritiana at 1.8 dS m-r (control) level have the highest survival rate (100o/o).The lowest survival rate of seedlings in elongated Z.mauritiqnaseedgenotypewasinallthreelevelsofsalinity(5.8, l0.2,and16.5dSmt;aidin round Z. mauritiana seed was at 16.5 dS m.