اثر تنش خشکی بر تخصیص مواد فتوسنتزی ژنوتیپ‌های لوبیاچیتی (Phaseolus vulgaris L.)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد، دانشکدۀ کشاورزی دانشگاه زنجان

2 استادیار، دانشکدۀ کشاورزی دانشگاه زنجان

چکیده

به‌منظور ارزیابی تأثیر تنش خشکی بر تخصیص مواد فتوسنتزی گیاه لوبیاچیتی (Phaseolus vulgaris L.) آزمایشی به‌صورت کرت­های خردشده در قالب بلوک­های کامل تصادفی در چهار تکرار در مزرعۀ پژوهشی دانشگاه زنجان اجرا شد. در این آزمایش، سطوح آبیاری در دو سطح (آبیاری مطلوب و تنش خشکی بعد از گلدهی) در کرت‌های اصلی و شش ژنوتیپ لوبیاچیتی (محلی خمین، COS16، صدری، KS21193، KS21191، KS21189) در کرت‌های فرعی قرار گرفتند. نتایج این بررسی نشان داد که تنش خشکی اثر معنی‌داری بر نسبت وزن ساقه و نسبت وزن غلاف داشت. ژنوتیپ KS21191 در شرایط تنش خشکی به‌دلیل تخصیص کمتر مواد فتوسنتزی به برگ‌ها و برخورداری از وزن خشک غلاف و زیست‌تودۀ بیشتر، از عملکرد دانۀ بیشتری برخوردار بود. در کل ژنوتیپ‌هایی که مواد فتوسنتزی کمتری به برگ‌ها و ساقه، و بیشترین مواد فتوسنتزی را به غلاف اختصاص دادند، در شرایط تنش برتری داشتند.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of drought stress on photo assimilate allocation of pinto bean (Phaseolus vulgaris L.)

نویسندگان [English]

  • Zahra Rezaei 1
  • farhad jabbari 2
1 Former Graduate Student, Faculty of Agriculture, Zanjan University
2 Assistant Professor, Faculty of Agriculture, Zanjan University
چکیده [English]

In order to estimate effects of drought stress on dry matter allocation of pinto bean (Phaseolus vulgaris L.), an experiment was carried out as split plot based on complete randomized block design with four replications at Zanjan university research farm. In this experiment,  two irrigation levels (optimum irrigation during growth season and post flowering drought stress) were set at main plots and  six pinto bean cultivars (Khomein, COS16, sadri, KS21193, KS21191, KS21189) were set at sub plots. Results showed that drought stress had significant effects on stem weight ratio and pod weight ratio. Also, KS21191 genotype had the highest grain yield under drought stress because of less allocation of photoassimilates to leaves and higher pod weight and higher biomass. Generally, cultivars that allocate less photoassimilates to leaves and stems and higher photoassimilates to pods had the priority under drought stress.

کلیدواژه‌ها [English]

  • Biomass
  • Grain yield
  • pod dry weight
  • pod weight ratio
  • stem weight ratio
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