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Abstract : |
Salinity tolerance during germination and early seedling growth was evaluated for nine wheat cultivar (Triticum aestivum L.) in six treatments of salinity including 0 (control), 75, 150, 225, 300 and 375 mM NaCl in a 3 replicated RCBD. The results showed that different treatments of salinity had considerable effect on the germination percentage, germination rate, elongation of the first leaf and root, total dry weight and root/shoot dry weight. Germination percentage in all cultivar showed considerable decrease with increasing salinity up to 375 mM NaCl. This reduction was more in Pishtaz and Ghods as compared to Tajan and Karchia. The seedling growth of nine genotypes was significantly inhibited by all salinity levels. During early seedling growth, applied NaCl salinity significantly affected the RGR of all the genotypes, particularly at 150-375 mM NaCl but there was no significantly difference at the low salinity treatments (p<0.05). The effect of salinity on RGR values varied according to the salt tolerance of the genotypes. First leaf and root length of all genotypes were considerably reduced. Elongation of the first leaf was more affected as compared to root growth at all salinity levels. Also, the rate of reducing of total dry matter was slower than reducing of leaf elongation. Cluster analysis with multiple parameters simultaneously to evaluate the salt tolerance revealed three groups. Karchia was used as a standard for the salt tolerance test. Among 9 genotypes, Tajan was the most tolerant and Pishtaz and Ghods were the most sensitive genotypes., |
