ارزيابي تحمل به تنش شوري در لاينهاي دابل ها پلوئيد و لاينهاي اصلاحي مطابق آنها در تريتيكاله از لحاظ صفات زراعي و مورفولوژيك

چكيده انگليسي :

Evaluation of salt tolerance in doubled haploid lines and their corresponding breeding lines in triticale for agro morphological traits Elnaz Ahmadi Shad e ahmadishad@ag iut ac ir Date of Submission 30 October 2010 Department of Agronomy and Plant Breeding Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Ahmad Arzani a arzani@cc iut ac ir Abstract Salinity is a main restricting factor to crop production in arid and semi arid regions of theworld This study was conducted to evaluate salt tolerance of doubled haploid lines and theircorresponding breeding lines in triticale for agro morphological and phenological traits usingtwo separate randomized complete block designs in 2008 09 The saline experiment wasirrigated using saline water 175 mM NaCl and EC 15 dSm 1 from mid jointing growth stage Zodak 43 onward Eighteen triticale lines including 9 doubled haploid and 9 corresponding F8breeding lines along with two wheat cultivars Roshan drought tolerance and Kavir salttolerance were used in this study The results showed that under both saline and non salineconditions the studied genotypes differed significantly for days to heading days to pollination last internode length flag leaf area number of grains per spike grain weight per spike biological yield and grain yield traits The results of combined analysis of variance showed thatsalt stress have significantly affected all traits with the exception of number of grains per spike Genotype by salt stress level interaction was significant for days to heading 1000 grain weightand harvest index Under both stress and non stress conditions triticale lines compared to thewheat cultivars performed significantly superior for biological and grain yield production Grain yield had significant and positive correlation with days to pollination days to maturity flag leaf area number of grains per spike grain weight per spike and biological yield but thiscorrelation was significant and negative with number of spikes per square meter under non saline conditions Under saline condition grain yield correlated highly significantly andpositively with days to heading days to pollination days to maturity spike length flag leafarea and harvest index Broad sense heritability of grain yield was estimated 52 under salineconditions which was significantly less than non saline condition 81 4 Stepwise regressionfor grain yield as the dependent variable versus yield components as the independent variableshowed that number of grains per spike and 1000 grain weight had the greatest contribution injustifying grain yield under non saline conditions Under saline conditions number of grains perspike and number of spikes per square meter had the greatest contribution in explaining grainyield variation Factor analysis for studied genotypes in saline and non saline conditionsrevealed four hidden factors which the important factor related to the yield components andplant performance under normal and saline conditions respectively Path analysis for grainyield showed that under both salt stress and non stress conditions number of grains per spikehad the greatest direct and positive effect on yield Cluster analysis of triticale and wheatgenotypes divided wheat cultivars into a seprate group under both conditions and triticale linesdivided into two and three groups under non saline and saline conditions respectively Amongselection indices used stress tolerance index STI was introduced as the superior index forselection under saline stressed field conditions Based on this index triticale F8 line number 6was selected as superior genotype for growing under saline stressed field conditions Keywords Triticale Salt stress Yield Yield components

احمدي شاد، الناز

ارزيابي تحمل به تنش شوري در لاينهاي دابل ها پلوئيد و لاينهاي اصلاحي مطابق آنها در تريتيكاله از لحاظ صفات زراعي و مورفولوژيك

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