بررسي كيفيت دانه و صفات فيزيولوژيك مرتبط با تحمل به تنش خشكي لاين هاي دابل هاپلوئيد و لاين هاي اصلاحي مطابق آنها در تريتيكاله

چكيده انگليسي :

Study of quality grain and physiological traits associated with drought tolerance in doubled haploid lines and their corresponding breeding lines in triticale Aboalghasem Akbarian a akbaryan82@yahoo com Aug 17 2009 Department of Agronomy and Plant Breeding Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Ahmad arzani a arzani@cc iut ac ir Abstract Drought stress as a physical stress is one of the most important constrains of growth and production ofcrop plants worldwide Attemps to develop new cereals with high yield potential and stability have beenconducted and triticale is the only successful case Triticale acquired superior yield potential and grainquality drived from wheat parent and the resistance to stress drived from rye parent To evaluatephysiological traits and grain quality of triticale lines 9 doubled haploid DH and 9 corresponding F7lines as well as two bread wheat cultivars Roshan and Kavir an experiment was conducted at researchfarm of College of Agriculture Isfahan University of Technology located at Lavark Najaf Abad in 2008 A randomized complete block design with 3 replications was used in each of two environmentalconditions of irrigation after 70 and 130 mm evaporation from a Class A pan respectively Results ofanalysis of variances revealed significant differences among genotypes for most of the studied traits withthe exception of length and width of flag leaf and grain dry mater Results of analysis of variances alsorevealed significant differences among F7 lines for most of studied traits with the exception of excisedleaf water reduction ELWR length stress condition and width of flag leaf DH lines variedsignificantly for most of studied traits with the exception of ELWR length and width of flag leaf yieldand grain dry matter The results of combined analysis of variances showed that water stress significantlyaffected most of traits with the exception of some physiological traits and grain dry mater nonfibercarbohydrates NFC protein content TSP test weight and gluten dry weight grain yield Significantlyand positively correlated with NFC superoxide dismutase SOD length of flag leaf and ELWR but thecorrelations with glutenin content was negative under normal condition Under water stress conditionsleaf water content chlorophill a b and NFC correlated with grain protein content negatively Positivecorrelation was observed between leaf area leaf angle ELWR lipid peroxidation LP and grain qualitytraits under water stress conditions explained ascorbate peroxides APX was negative correlated withgrain yield The highest genetic variations under normal and stress condition were observed for wetgluten weight and proline respectively The lowest genetic variation allocated to grain dry matter underboth conditions The results of stepwise regression for grain protein as dependent trait and others asindependent traits showed that 84 7 of variation explained by two trait NFC and test weight undernormal and 99 4 of variation observed by five trait chlorophyll a b leaf area ELWR gliadin and APXunder stress conditions respectively The results of factor analysis indicated 8 factors under normal andstress conditions The first factor related to photosynthesis and second to forth factors related to proteincontent and quality and fifth to eighth factors related to flag leaf grain nutrition and effect rate of waterloss RWL on NFC and photosynthesis respectively Overall doubled haploid lines performed superiorfor physiological traits and F7 lines for grain quality traits It is concluded that doubled haploid lines of 17was generally considered as superior under both environmental conditions Key words Triticale physiological traits grain quality doubled haploid lines droughttolerance

اكبريان، ابوالقاسم

بررسي كيفيت دانه و صفات فيزيولوژيك مرتبط با تحمل به تنش خشكي لاين هاي دابل هاپلوئيد و لاين هاي اصلاحي مطابق آنها در تريتيكاله

پرولين , رسوب SDS