نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه به نژادی و بیوتکنولوژی گیاهی، دانشکده کشاورزی، دانشگاه تبریز
2 گروه اکوفیزیولوژی گیاهی، دانشکده کشاورزی، دانشگاه تبریز
3 بخش تحقیقات غلات، موسسه تحقیقات اصلاح و تهیه نهال و بذر، کرج
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Background and Objective: The effect of water-deficit stress on physiological traits and root characteristics of winter barley genotypes, was studied in greenhouse conditions.
Materials and Methods: The experiment was conducted as factorial based on a randomized complete block design with two replications. The factors were two irrigation levels (normal irrigation and drought stress by withholding irrigation at tillering) and 28 barley genotypes.
Results: There were significant differences between the genotypes concerning all traits except leaf temperature. The genotype by irrigation interaction was significant for all traits except leaf temperature. The Ward clustering method resulted in four clusters at both normal and water-deficit-stress conditions. The favorable genotypes were included in groups in both conditions. The results of hierarchical path analysis of traits related to the shoot dry weight under normal conditions showed that the direct effects of root dry weight and root volume on shoot dry weight were positive and significant and the direct effects of leaf chlorophyll index, proline, and osmotic potential on this characteristic were negative and significant. At the water-deficit-stress conditions, root volume and leaf chlorophyll index had positive and significant direct effects on shoot dry weight and proline, and root dry weight and osmotic potential had negative and significant direct effects on this trait.
Conclusion: Genotypes Cyclone/Arar, Lignee 131//4341 N/Ortolan, Comp 89-9Cr-79-07/Atem//(Alpha/HC1905//Robur)/3/…, MAKOUEE//ZARJOW/80-5151, and Arar/L. 1242 had a higher mean concerning most root and physiological characters at both normal and drought stress conditions which can be considered as suitable genotypes for both conditions.
or both conditions.
کلیدواژه‌ها [English]
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