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حامد نوری زاده محمدحسین اهتمام احمد ارزانی محسن اسماعیل زاده مقدم

چکیده

به‌منظور ارزیابی آثار تنش رطوبتی بر صفات زراعی و مورفولوژیک لاین‌های اینبرد نوترکیب گندم، مطالعه‌ای با استفاده از 169‌لاین در قالب دو طرح لاتیس جداگانه (تنش رطوبتی و شاهد) اجرا شد. دو رژیم رطوبتی مشتمل بر آبیاری بر اساس 70 و 130‌میلی‌متر تبخیر از تشتک تبخیر کلاس A و همین‌طور درصد رطوبت وزنی خاک استفاده شد. نتایج تجزیه واریانس نشان داد که تفاوت بین لاین‌ها در شرایط عادی رطوبتی برای کلیه صفات به‌جزء تعداد دانه در سنبله، وزن دانه در سنبله، طول سنبله، تعداد روز تا گرده‌افشانی و تعداد روز تا رسیدگی معنی‌دار بوده است. در شرایط تنش رطوبتی نیز تفاوت لاین‌ها برای همه صفات به‌جزء تعداد دانه در سنبله، وزن هزار‌دانه و طول سنبله معنی‌دار بود. تنش رطوبتی موجب کاهش تعداد روز تا ظهور سنبله، تعداد روز تا گرده‌افشانی، تعداد روز تا رسیدگی، تعداد سنبله در واحد سطح، طول سنبله، ارتفاع بوته، تعداد دانه در سنبله، وزن دانه در سنبله، وزن هزار‌دانه، عملکرد بیولوژیک، عملکرد دانه و شاخص برداشت گردید. وراثت‌پذیری خصوصی شاخص برداشت در شرایط عدم تنش رطوبتی کمتر از شرایط اعمال تنش بود. بیش‌ترین وراثت‌‌پذیری خصوصی در شرایط معمول رطوبتی به تعداد سنبله در واحد سطح (77درصد) و در شرایط تنش رطوبتی به عملکرد دانه (84درصد) اختصاص داشت. نتایج رگرسیون مرحله‌ای در شرایط تنش رطوبتی نشان داد که تعداد سنبله در واحد سطح اولین متغیر وارد شده به مدل بوده است که به‌تنهایی 65‌درصد از تغییرات عملکرد دانه را تبیین نمود.

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ارجاع به مقاله
نوری زادهح., اهتمامم., ارزانیا., & اسماعیل زاده مقدمم. (2015). تأثیر تنش رطوبتی بر صفات زراعی و مورفولوژیک لاین‌های اینبرد نوترکیب گندم. پژوهشهای زراعی ایران, 14(4), 599-617. https://doi.org/10.22067/gsc.v14i4.31822
نوع مقاله
علمی پژوهشی