ارزيابي پاسخ ژنوتيپ هاي جو به تنش شوري در سطوح مختلف نيتروژن

چكيده انگليسي :

Evaluation of Barley Genotypes in Response to Salt Stress at Different Levels of Nitrogen Hosein Azizi Alvar h2azizi@gmail com July 14 2014 College of Agriculture Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiMorteza Zahedi mzahedi@cc iut ac irHamidreza Eshghizadeh hr eshghizadeh@cc iut ac irAbstractA pot experiment was carried out in a greenhouse at the College of Agriculture Isfahan University ofTechnology in 2013 to evaluate the effects of different levels of nitrogen on the response of barleygenotypes to salinity The experiment was arranged as factorial based on a completely randomized blockdesign with three replications In this experiment nine barley genotypes CB 84 10 Yousef Reyhan 03 Line 4 salt tolerant Line 5 salt tolerant Nosrat Loot Bahman and Fajr 30 were evaluated under twolevels of salinity 0 and 150 mM of NaCl and two levels of nitrogen 0 and 46 2 mg kg pot soil Plantheight number of tillers leaf area shoot and root dry weight photochemical efficiency of PS II Fv Fm the concentration of nitrogen potassium potassium sodium ratio in shoots were reduced but leafyellowness intensity shoot root dry weight ratio SPAD index the content of sodium proline and solublecarbohydrates in shoot and the concentration of nitrogen in roots were increased under saline treatment With an increase of soil nitrogen the values of plant height number of tillers leaf area shoot dry weight shoot root dry weight ratio SPAD index photochemical efficiency the concentration of potassium potassium sodium ratio in shoot and the concentrations of nitrogen in shoot and roots were increased while that of leaf yellowness intensity was reduced The interaction between salinity and nitrogen wassignificant on the number of tillers leaf area leaf yellowness intensity shoot dry weight SPAD index the content of potassium and soluble carbohydrates in shoot and the concentrations of nitrogen in shootand roots Under non saline condition shoot dry weight was increased by 24 as a result of nitrogenapplication while the difference between the two levels of nitrogen was not significant in this regardunder saline condition The interaction between salinity and genotype was significant on the number oftillers root dry weight the content of sodium potassium sodium ratio and the content of proline in shootand the concentration of nitrogen in roots Based on the reductions in shoot dry weight of barleygenotypes Nosrat was the most tolerant and Loot was the most sensitive genotype in response to salinity There was a significant correlation between the reduction in potassium sodium ratio in shoots under saltcondition and salt tolerance of barley genotypes The results of this experiment showed that there wasconsiderable variation among barley genotypes in response to salinity Also nitrogen application resultedin increased growth of barley genotypes under non saline condition however under situation of thisexperiment plant growth was not significantly improved by nitrogen application under saline condition Key word Salinity barley genotypes nitrogen sodium potassium potassium sodiumratio SPAD index photochemical efficiency of PS II Fv Fm

عزيزي الوار، حسين

ارزيابي پاسخ ژنوتيپ هاي جو به تنش شوري در سطوح مختلف نيتروژن

سديم , پتاسيم , نسبت سديم به پتاسيم , شاخص سبزينگي