بررسي كيفيت دانه و صفات فيزيولوژيك مرتبط با تحمل به تنش شوري در لاين هاي اصلاحي تريتيكاله

چكيده انگليسي :

Investigation of Grain Quality and Physiological Traits Associated with Salinity Tolerance in Triticale Breeding Lines Maryam Salehi Salehi Maryam 83@yahoo com Date of Submission 31 10 2010 Department of Agronomy and Plant Breeding Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language Farsi Supervisors s name and email address Ahmad Arzani a arzani@cc iut ac ir AbstractSalinity is one of the major abiotic stresses that causes yield loss of many crop plants Triticale X Triticosecale Wittmack is as the most successful man made cereal was synthetized to achive a cerealpossessing unique grain quality of wheat parent with tolerance to abiotic and biotic stresses of rye parent To investigate physiological and grain quality traits of eighteen triticale lines comprising 9 doubledhaploid DH lines and 9 their corresponding F8 lines as well as two bread wheat cultivars Roshan and Kavir an experiment was conducted using a randomized complete block design with three replicationsfor each of the environmental conditions non stress and salt stress conditions at the research farm ofCollege of Agriculture Isfahan University of Technology with the soil of silty clay loam in 2008 2009 Salt stressed experiment was irrigated by saline water using 175 mM NaCl and EC 15 ds m 1 from mid jointing growth stage Zadoks 43 onward Results of analysis of variance showed significant differencesamong the genotypes for all of the studied traits The results of combined analysis of variance revealedthat salt stress significantly influenced all of the studied traits Under both conditions orthogonalcomparison indicated that triticale lines performed superior than wheat cultivars considering mostphysiological traits and grain yield while wheat cultivars were superior for grain quality traits Under bothconditions Kavir wheat cultivar possessed the highest protein contents of 15 20 and 17 93 under non stress and salt stress conditions respectively Under both growth conditions antioxidant activities forascorbate peroxidase glutathione reductase and super oxide dismutas were greater in triticale lines thanwheat cultivars Further lipid peroxidation of triticale lines was less than wheat cultivars Under bothconditions positive and significant correlations were observed between grain yield with area of flag leaf dry weight of peduncle and relative water content but grain yield had negative and significant correlationcoefficients with protein content sodium dodecyl sulphate sedimentation volume and gluten content Grain yield had positive and significant correlation with leaf rolling under non stress conditions Negativeand significant correlation coefficient was observed between proline content produced under salinitystress conditions and grain yield loss indicating a positive role of proline in salinity tolerance Factoranalysis revealed 9 and 10 factors which explained 89 15 and 91 21 of grain variation under non stress and salt stress conditions respectively Results of stepwise regression for grain yield showed that92 of its variation could justify protein content flag leaf area glutenin length of peduncle and fibercontent under non stress conditions and 84 1 percent of the variation justified by four traits of dry weightof peduncle ash content glutenin and area of flag leaf under salt stress conditions The results of stepwiseregression for protein content showed that 94 9 of grain variation explained by five traits of dry glutencontent ash content length of flag leaf length of peduncle and grain weight under non stress conditionsand 84 1 percent of variation explained by four traits of SDS sedimentation volume angle of flag leaf glutenin and relative water content under stress conditions In this study DH line number 11 possessedthe relative water content length of awn length and dry weight of peduncle and grain yield under non stress conditions and considered as a superior genotype in this conditions Triticale F8 line number 6 possessing the least

صالحي، مريم

بررسي كيفيت دانه و صفات فيزيولوژيك مرتبط با تحمل به تنش شوري در لاين هاي اصلاحي تريتيكاله

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