مطالعه توارث پروتئين وبرخي صفات ديگر درگندم نان تحت شرايط معمول رطوبتي و تنش خشكي

A Study of Protein Inheritance in Bread Wheat under Drought Stress & Normal Conditions

In orderto investigate the type of gene action and heritability for seed protein percent, seed protein yield and some other traits in bread wheat, seven cultivars namely, Atrak, Khazar, Tajan, Falat, Bezosraya, Golestan and Mabdavi were intercrossed in a half diallel fashion. Parents and their progenies were planted in a randomized complete block design with three replications in normal and drought stress conditions. Analysis of variance indicated a significant difference among genotypes for all traits in eithercondition. Griffing & Hayman-Jinks procedures were employed to analyze the data. Analysis of general and specific combining abilities (GCA & SCA) were done using Griffing method(lI). Mean squares of GCA & SeA were significant for all characteristics in hoth normal and drought stress conditions, showing additive andnon-additive effects control of thesecharacteristics. On the other hand, the results show thatseedprotein percent is controlled by only additive effects while additive and non-additive effects control yield and seed protein yield Regression coefficient (b) wasnʹt significantly different from I, that shows the results arc corrected. Narrow-sense heritability estimates ranged from 21%to 67% with plant height having the highest estimates. Thecstimeses of narrow-sense andbroad-sense heritability for seed protein percentage (59% & 78% respectively) indicated the effectiveness of selection for this trait. But the narrow-sense heritability ranging from 21% to 26% for seed protein yield in normal and drought conditions shows that there isnʹ much expectation in the effectiveness of selection for it. The results indicate that seed protein percentage is controlled by additive effects but additive-dominance model can he appropriate for yield andseedprotein yield. Acomparison of banding patterns resulted from the electrophoresis of seed storage proteins under normal and drought stress eonditions revealed that drought stress had no effect on the banding patterns and it was only bands densities that were affected.