تجزیة ضرایب همبستگی بین عملکرد دانه و اجزای آن در ژنوتیپ‌های لوبیا چشم‌بلبلی در شرایط نرمال و تنش خشکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران

2 استاد، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران

چکیده

به‌منظور محاسبۀ ضرایب همبستگی میان عملکرد دانه و اجزای عملکرد، 31 ژنوتیپ لوبیا چشم‌بلبلی در دو شرایط آبیاری معمول (بدون تنش) و آبیاری محدود (قطع آبیاری از مرحلة گلدهی تا پایان دورۀ رشد) در طرح بلوک‌های کامل تصادفی در سه تکرار در مزرعۀ تحقیقاتی دانشکدۀ کشاورزی دانشگاه تهران واقع در کرج در سال زراعی 1390-91 ارزیابی شدند. در این پژوهش صفات ارتفاع بوته، تعداد شاخه‌های بوته، تعداد غلاف در بوته، تعداد دانه در غلاف، عملکرد بیولوژیک تک‌بوته، عملکرد دانۀ تک‌بوته و وزن صددانه ارزیابی شد. نتایج نشان داد که در هر دو شرایط تنش و بدون تنش، صفات عملکرد بیولوژیک و تعداد غلاف در بوته بیشترین همبستگی را با عملکرد دانه داشتند. نتایج رگرسیون گام‌به‌گام در هر دو شرایط نشان داد که حداکثر اختلاف عملکرد دانهۀژنوتیپ‌ها را می‌توان به عملکرد بیولوژیک و تعداد غلاف در بوته نسبت داد. نتایج تجزیة علیت بر اهمیت تأثیرات این صفات در عملکرد دانه تأکید داشت. به‌طور کلی، در هر دو شرایط تنش و بدون تنش، بیشترین اثر مستقیم و مثبت بر عملکرد دانه مربوط به عملکرد بیولوژیک بود.نتایج نشان داد که در برنامه‌های اصلاحی با هدف افزایش عملکرد دانه در ارقام لوبیا چشم‌بلبلی، بهتر است گزینش براساس صفات عملکرد بیولوژیک و تعداد غلاف در بوته انجام گیرد.

کلیدواژه‌ها


عنوان مقاله [English]

Analysis of correlation coefficients between grain yield and yield components in cowpea genotypes under normal and drought stress conditions

نویسندگان [English]

  • Seyed Hamzeh Hosseinian 1
  • Naser Majnoon Hosseini 2
1 Former Graduate Student, University College of Agriculture and Natural Resources, University of Tehran, Karaj
2 Professor, University College of Agriculture and Natural Resources, University of Tehran, Karaj
چکیده [English]

In order to deliberate correlation coefficient between grain yield and yield components among 31 cowpea genotypes under normal irrigation (non-stress) and drought stress (water withholidng after flowering stage until maturity) an experiment was performed in a randomized complete block design (RCBD) with three replications at research field of University of Tehran located at Karaj during 2011-2012 growing season. The traits measured comprised of plant height, branches number per plant, pods number per plant, seeds per pod, biological yield, grain yield per plant and 100 seed-weights. Results showed that under both irrigation regimes, biological yield and pods number per plant were highly correlated with grain yield. Stepwise regression analysis revealed that biological yield and pods number per plant had the highest effect on grain yield of cowpea genotypes under both irrigation conditions. Path analysis showed that the highest direct positive effect of biological yield and pods number per plant on grain yield under both conditions. Therefore, in breeding programs, to boosting grain yield in cowpea genotypes, it is better that the selection to be based on the biological yield and number of pod per plant traits.

کلیدواژه‌ها [English]

  • coefficient correlation
  • cowpea genotypes
  • Drought stress
  • Path analysis
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