Association between water use efficiency components and stomatal conductance in some Iranian wheat cultivars

Document Type : Research Paper


Department of Agronomy and Plant Breeding, Faculty of Agriculture, University of Zanjan, Zanjan, Iran.


Wheat is a pivotal crop plant in Iran. However, it is mostly grown in drought prone areas of Iran. On the other hand, the trend of global warming is increasing. Therefore, in order to better use the limited water sources, it is needed to improve wheat yield by studying the mechanisms of enhancing water use efficiency (WUE). This study was conducted to determine the effect of stomatal conductance (gs) on water use efficiency and its components in wheat (Triticum aestivum L.). Seven bread wheat cultivars (Marvdasht, B.C.Roshan,Darab2, Vee/Nac, Shiraz, Chamran, Maroon) were grown in pots under well-watered conditions. The pattern of variation for WUE and its components was different for cultivars. Stomatal conductance showed a positive correlation with total water use, transpiration efficiency and grain yield. A path analysis revealed that transpiration efficiency had a higher direct effect on grain yield (0.91) than did harvest index (0.40). Although gs showed a direct effect of almost zero on grain yield, but imposed its effect indirectly via transpiration efficiency (0.47).


Article Title [فارسی]

رابطه بین اجزای کارایی مصرف آب و هدایت روزنه‌ای در برخی از ارقام ایرانی گندم

Authors [فارسی]

  • نسترن مهری
  • رضا فتوت
  • احسان محسنی فرد
Abstract [فارسی]

با وجود نقش محوری گندم، کشت آن در ایران اغلب به صورت دیم است. از طرف دیگر روند گرم شدن جهانی به صورت افزایشی است. برای استفاده بهینه از منابع محدود آب، اصلاح عملکرد گندم از طریق مطالعه سازوکار‌های افزایش کارائی مصرف آب، امری ضروری است. در این مطالعه اثر هدایت روزنه‌ای (gs) بر روی کارایی مصرف آب (WUE) و اجزای آن در گندم نان (Triticum aestivum L.) مورد مطالعه قرار گرفت. هفت کولتیوار گندم نان (مرودشت، روشن B.C.، داراب 2، Vee/Nac، شیراز، چمران، مارون) در گلدان تحت شرایط آبیاری نرمال کشت شدند. الگوی تغییرات برای WUE و اجزای آن در کولتیوارهای مختلف، متفاوت بود. هدایت روزنه‌ای همبستگی مثبت با کارایی مصرف آب کل، کارایی تعرق  و عملکرد دانه داشت. تجزیه ضرایب مسیر نشان داد که اثر مستقیم کارایی تعرق بر عملکرد دانه (91/0) بیشتر از اثر مستقیم HI (40/0) بود. اگر چه gs اثر مستقیم نزدیک به صفر روی عملکرد دانه داشت، ولی اثر خود را به طور غیرمستقیم از طریق کارایی تعرق (47/0) اعمال نمود.

Keywords [فارسی]

  • شاخص برداشت
  • کارایی تعرق
  • کارایی مصرف آب
  • هدایت روزنه‌ای
  • Triticum aestivum L
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