نوع مقاله : مقاله پژوهشی
چکیده
عنوان مقاله [English]
In order to evaluate the relationships between some traits of Iranian rice seedlings under saline conditions,,75 Iranian cultivars as traditional, improved and introduced cultivars were used, as a randomized complete block design experiment with 3 replications at Rice Research Institute of Iran in three levels of salinity (normal ,1.2 , 4 and 8 dS.m-1) in 2006. Root and shoot length, root and shoot dry weight, Na+ and K+ concentration in shoot and genotypic code ( based on IRRI protocol) were recorded. Tolerant cultivars had high biomass (root and shoot dry weight) and low Na+/K+ ratio. Negative and significant correlations were detected among shoot dry weight, biomass and genotype code, while positive and significant correlations were seen among Na+ concentration, Na+/K+ ratio and genotype code in 4 and 8 dS.m-1 levels. Significant and robust correlations were seen between mean productivity index (MP), tolerance index (TOL), stress tolerance index (STI), stress susceptibility index (SSI) and harmonic mean (HM) for Na+ and mean productivity, stress tolerance index and stress susceptibility index for Na+/K+ ratio with genotypic code (P
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