روابط همبستگی و علیت عملکرد و اجزای عملکرد ژنوتیپ های گلرنگ در شرایط تنش خشکی انتهای فصل

نوع مقاله: علمی پژوهشی

نویسنده

عضو هیئت علمی گروه زیست شناسی، دانشکده علوم پایه، دانشگاه صنعتی خاتم الانبیاء بهبهان

چکیده

به ‌منظور محاسبه ضرایب همبستگی و تجزیه مسیر برخی صفات مرتبط با عملکرد، 15 ژنوتیپ گلرنگ در شرایط بدون تنش و تنش خشکی به صورت دو آزمایش جداگانه در مزرعه دانشکده کشاورزی دانشگاه لرستان اجرا شد. هر کدام از این آزمایش­ ها در قالب طرح بلوک‌های کامل تصادفی با سه تکرار پیاده شدند. نتایج تجزیه واریانس نشان داد که اختلاف معنی‌داری بین ژنوتیپ‌ها از نظر صفات مورد مطالعه و عملکرد در دو شرایط محیطی تنش و بدون تنش وجود دارد. با استفاده از رگرسیون گام به گام مناسب‌ترین مدل در هر دو محیط ارایه شد. انجام تجزیه مسیر ترتیبی با استفاده از همبستگی­ های ژنتیکی برای عملکرد دانه و سایر صفات مرتبط نشان داد که در شرایط بدون تنش، صفات وزن هزار دانه و قطر ساقه دارای اثر مستقیم و بالا روی عملکرد دانه بودند درحالی‌که در شرایط تنش خشکی، وزن دانه در بوته و وزن هزار دانه بیشترین اثر مستقیم را نشان دادند. بنابراین، برای رسیدن به ارقام پر محصول گلرنگ در شرایط تنش خشکی به احتمال قوی می‌توان با انتخاب ارقامی با بیشترین وزن دانه در بوته دست یافت.

کلیدواژه‌ها


عنوان مقاله [English]

Correlation and Path Analysis of Yield and Yield Components of Safflower Genotypes under Late Season Drought Stress Conditions

نویسنده [English]

  • Seyedeh Zahra Hosseini
Scientific Staff Member, Department of Biology, Faculty of Basic Sciences, Khatam -Alanbia University of Technology, Behbahan, Iran
چکیده [English]

To calculate correlation coefficients and path analysis of some traits related to grain yield, 15 genotypes of safflower were studied under non-stress and drought stress conditions at two different sites (with 10 meter distance) in the field of College of Agriculture of Lorestan University, Iran. Each experiment was conducted in a randomized complete block design with three replications. Analysis of variance showed that there were significant differences among the genotypes for all measured traits and yield in both stress and non- stress conditions. By using stepwise regression, best model was estimated for the two conditions. Sequential path analysis of the correlation between grain yield and other traits showed that days to start flowering, 1000-seed weight and stem diameter had direct effects on grain yield under non-stress conditions, while under drought conditions, seed weight per plant and 1000-seed weight had direct and positive effects on grain yield. Thus, to obtain high yielding varieties of safflower under drought stress condition, we showed attempt to select varieties with high seed weight per plant.

کلیدواژه‌ها [English]

  • analysis of variance
  • genetic correlation
  • Seed weight
  • stepwise regression
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