Effect of silicon application on wheat seedlings growth under water-deficit stress induced by polyethylene glycol

Document Type: Research Paper


Department of Agronomy, Ramin Agriculture and Natural Resources University, Khuzestan, I. R. Iran


Silicon is known to ameliorate the deleterious effects of drought on plant growth. We evaluated growth of wheat (Triticum aestivum L. CV. Chamran) under Water-Deficit Stress Induced by Polyethylene Glycol as affected by Si application. In this article, the effects of Si (as potassium silicate) on some parameters related to growth, chlorophyll concentration relative water content (RWC), electrolyte leakage, proline, soluble sugar, and inorganic ions in the leaves of wheat under 20% (w/v) polyethylene glycol (PEG-6000) simulative drought stress are investigated. PEG stress depressed the growth of shoot, RWC and chlorophyll concentration. Addition of 1.0 mM Si could partially improve the growth of shoot (but not root) and increase the chlorophyll concentrations of stressed plants. The proline concentration in the leaves was markedly increased under PEG stress, whereas added silicon partially reversed this. PEG stress decreased the leaf soluble sugar concentration. There were significant negative regressions between proline concentration and Shoot dry weight, supporting the view that proline accumulation is a symptom of stress damage rather than stress tolerance. Addition of Si obviously increased Si accumulation in the shoot. Analyses of K, and Ca showed no accumulation of these ions in the shoot under water stress, and added Si even increased their concentrations under water stress. These results suggest that under PEG-induced water stress conditions, increase soluble sugar and decrease electrolyte leakage, contributed to the improved wheat growth by Si.


Main Subjects

Article Title [Persian]

تاثیر کاربرد سیلیسیوم بر رشد گیاهچه ای گندم در شرایط تنش رطوبتی ناشی از پلی اتیلن گلیکول

Authors [Persian]

  • عزیز کرملاچعب
  • محمد حسین قرینه
دانشگاه خوزستان
Abstract [Persian]

سیلیسیم به‏عنوان اصلاح کننده اثرات تنش خشکی بر رشد گیاه معرف است. در این پژوهش رشد گیاه گندم (Triticum aestivum L.) رقم چمران، تحت شرایط کمبود رطوبتی ناشی از پلی‏اتیلن‏گلیکول و کاربرد سیلیسیم مورد ارزیابی قرار گرفته است. تنش کمبود رطوبت، رشد اندام هوایی گیاه، محتوای نسبی آب و غلظت کلروفیل را کاهش داد. اضافه کردن یک میلی‏مولار سیلیسیم، به‏صورت جزئی باعث بهبود رشد اندام هوایی و افزایش غلظت کلروفیل گیاهان تنش دیده شده است. غلظت پرولین برگ‏ها در شرایط تنش کمبود رطوبت افزایش قابل توجهی داشته و سیلیسیم باعث کاهش آن گردید. تنش کمبود رطوبت، غلظت قندهای محلول برگ را کاهش داد. همبستگی منفی معنی‏داری بین غلظت پرولین و وزن خشک اندام هوایی مشاهده شد که نشان می‏دهد تجمع پرولین، به عنوان یک نشانه‏ای از آسیب تنش تا تحمل آن می‏باشد. اضافه نمودن سیلیسیم، به‏طور واضح غلظت سیلیسیم اندام هوایی را افزایش داد. آنالیزهای پتاسیم و کلسیم نشان داد تجمع این یون‏های در شرایط تنش کمبود رطوبت و کاربرد سیلیسیم نسبت به شاهد کاهش یافته است. نتایج نشان داد که در شرایط تنش کمبود رطوبتی ناشی از پلی‏اتیلن‏گلیکول، رشد گیاه از طریق افزایش قندهای محلول و کاهش نشت الکتولیتی به‏وسیله سیلیسیم بهبود یافته است.

Keywords [Persian]

  • تنظیم اسمزی
  • سیلیسیم
  • تنش کمبود رطوبت
  • گندم
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