3792

3589

كارشناسي ارشد

اصلاح نباتات

اصفهان : دانشگاه صنعتي اصفهان ، دانشكده كشاورزي

1386

دوازده، 123، [II] ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

احمد ارزاني

اسماعيل لندي

4/10/86

محمد مهدي مجيدي، علي اكبر رامين

مهندسي كشاورزي

ID3589

به فارسي و انگليسي : قابل رؤيت در نسخه ديجيتال

Abstract Drought stress as the most important abiotic stress plays an important role in the yieldreduction of crop plants worldwide For improvement of complex traits such as yieldpossessing low heritability indirect selection is applied by using other traits viz morph physiological traits The study of physiological response of different cultivars to waterstress could be beneficial in understanding of the mechanisms of drought resistance Therefore this study was conducted to evaluate the effect of water stress on themorphological physiological and quality of five triticale X Triticosecale Wittmack genotype including one sensitive genotype and four resistance genotypes based ongermination test as well as one bread wheat and one durum wheat cultivars at ResearchFarm of Isfahan University of Technology A randomized complete block design withthree replication was used in each of two environment i e irrigation after 70 and 130mm evaporation from class A pan respectively Results of analysis of variancerevealed significant differences among cultivars for most of studied traits under nonstress condition with the exception of the followings relative water content RWC initial water content IWC weight of flag leaf gluten dry weight protein percentage protein content TSP gliadin and glutenin content under moisture stress conditionthere were significant differences among cultivars for most of studied traits with theexception of chlorophyll a RWC and rate of water loss RWL The results ofcombined analysis showed that water stress significantly effected on most of the traitswith the exception of IWC awn length weight of flag leaf number of stomata angle offlag leaf and gluten dry weight The correlation coefficients revealed that traits relatedwith leaf water content had negative effect and leaf area number of stomata hadpositive effect on grain quality traits under moisture stress Only excised leaf waterretention ELWR had significant and negative correlation with grain yield In nonstress condition width and area of flag leaf and angle of flag leaf had significant andnegative correlation with grain yield ELWR had significant and positive correlationwith yield The results of factor analysis under non stress condition indicated 7 factorsexplained 87 6 and 88 9 of total variation of yields under non stress and stressconditions respectively The results of stepwise regression showed that ELWR and awndry weight contributed in 90 of observed variation for grain yield under non stresscondition Under stress condition rate of water loss contributed in 64 of observedvariation for grain yield The results of stepwise regression under non stress conditionshowed that ELWR and IWC contributed in 91 of observed variation for grainprotein Under stress conditions flag leaf area leaf rolling and rate of water losscontributed in 99 of observed variation for grain protein According to the results ofpresent study it is concluded that Lasko and Moreno triticale genotypes were the mosttolerant genotypes and Pergo genotype was a sensitive genotype under water stressconditions

احمد ارزاني

اسماعيل لندي

محمد مهدي مجيدي، علي اكبر رامين