Determination of Aluminum Stress Tolerance Threshold During Seed Germination of Wheat

Document Type : Research Paper


1 1MSc Student, University of Mohaghegh Ardabili, Ardabil, Iran

2 University of Mohaghegh Ardabili, Ardabil, Iran

3 University of Mohaghegh Ardabili, Ardabil,


Environmental stresses are the most important factors that reduce plant growth in stages of development. The presence of aluminum in acidic soils as an environmental stress has an impact on different parts of the plant and reduces root growth, water absorption and nutrients and increases susceptibility to drought.  In order to evaluate the effect of aluminum stress levels on wheat at germination stage, an experiment was conducted as factorial based on completely randomized design with three replications. The root and shoot characters of four wheat cultivars (Arta, Gascozen, Moghan3, Mihan) at seedling stage were studied at eight stress levels (control, 0.5, 1, 1.5, 2, 2.5, 5 and 10 mM Al
). The root and shoot fresh weight, root and shoot length, root volume and area, root number and Root/Shoot ratio were measured. Results showed that stress level had significant effects on all studied traits. Also, wheat cultivars were significantly different for number, volume, weight and area of root and also shoot length. Interaction between cultivars and stress levels was significant for root number. The Mogha3 variety had higher root number at 2.5 mM Al
stress level. In all of varieties, the root number increased by increasing of Al
concentration. Comparison of means showed that Al
stress caused significant reduction in all studied traits except root number. The Moghan3 variety had higher means for studied traits as compare with other varieties.


Article Title [فارسی]

تعیین آستانه تحمل تنش آلومینیوم در مرحله جوانه زنی گندم

Abstract [فارسی]

تنش­های محیطی از مهم‌ترین عوامل کاهش رشد در مراحل رشد و نمو گیاهی از جمله در مرحله جوانه‌زنی می‌باشند. آلومینیوم در خاک‌های اسیدی یکی از تنش‌های محیطی به حساب می­آید که روی بخش‌های مختلف گیاه تاثیر گذاشته و منجر به کاهش رشد ریشه، کاهش جذب آب و مواد غذایی و افزایش حساسیت به خشکی‌ می‌شود. گندم از جمله گیاهان استراتژیک و با ارزش بوده و شناسایی ارقامی که قادر باشند تنش را در مرحله جوانه‌زنی تحمل کرده و گیاهچه‌ی بیشتری تولید کنند دارای اهمیت است. در همین راستا، آزمایشی به‌صورت فاکتوریل در قالب طرح پایه‌ کاملا تصادفی با سه تکرار انجام شد. خصوصیات ریشه و اندام هوایی 4 رقم گندم (آرتا‍، گاسکوژن، مغان3، میهن) در سطوح تنش شامل شاهد، 5/0، 1، 5/1، 2، 5/2، 5 و 10 میلی‌مولار آلومینیوم مورد‌ مطالعه قرار گرفت. صفات اندازه‌گیری شده شامل وزن تر ریشه‌چه و ساقه­چه، طول ریشه‌چه و ساقه‌چه، حجم ریشه‌چه، سطح ریشه‌چه و نسبت طول ساقه‌چه به ریشه‌چه بود. . نتایج حاصل نشان داد که سطوح تنش بر تمامی صفات تاثیر معنی‌دار داشت. هم‌چنین بین ارقام گندم از لحاظ صفات حجم، وزن، تعداد و سطح ریشه و نیز طول ساقه‌چه اختلاف معنی‌دار مشاهده شد. اثر متقابل رقم در تنش فقط برای تعداد ریشه‌چه معنی‌دار شد به‌طوری‌که در سطح تنش 5/2 میلی مولار، رقم مغان 3 بیشترین میانگین تعداد ریشه‌چه را دارا بود. با افزایش سطح تنش تعداد ریشه‌چه در همه ارقام کاهش یافت. نتایج مقایسه میانگین‌ها نشان داد که تنش آلومینیوم باعث کاهش معنی‌دار تمامی صفات مورد بررسی به استثنای تعداد ریشه‌چه شد. رقم مغان 3 در اغلب صفات دارای میانگین بالاتری نسبت به بقیه ارقام بود.

Keywords [فارسی]

  • آلومینیوم
  • تحمل
  • جوانه‌زنی
  • گندم
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