The effect of exogenous silicon on seed germination and seedling growth of wheat cultivars under salt stress conditions

Document Type: Full Article

Authors

Department of Crop Production, College of Agriculture, Shiraz University, Shiraz, I. R. Iran

Abstract

ABSTRACT- Seed germination and early seedling growth are critical stages for plants establishment and production, particularly under salinity conditions. Exogenous application of silicon (Si) can enhance germination as well as seedling growth. In this experiment, the effect of priming with Si (0, 0.75, 1.5 and 2.25 mM sodium silicate) on seed germination and seedling growth under NaCl (0, 100 and 150 mM) conditions was studied in two wheat cultivars of Kavir (salt tolerant) and Shiraz (salt sensitive). The experiment was designed as a factorial based on completely randomized design with three replications in the laboratoryof college of Agriculture, Shiraz University, in 2012. Results showed that seed priming by Si improved germination percentage, germination rate, vigor index, shoot and root length and seedling dry weight in both stress and non-stress conditions. Moreover, Si increased K+ uptake and K+/Na+ ratio and decreased Na+ content of cultivars with the effect of 2.25 mM being more pronounced. On the contrary, salt stress reduced the above traits andK+ uptake and K+/Na+ ratio and increased mean germination timeand Na+ uptake in both cultivars with the negative effects of 150 mMNaCl being more severe. However, the tolerant cultivar (Kavir) accumulated less Na+ and more K+ and had greater K+/Na+ ratio compared to non-tolerant cultivar (Shiraz). Although the salinity adversely affected seed germination and seedling growth in both cultivars, Kavir (tolerant cultivar) was less affected. It was concluded that priming with Si may promote germination and subsequent seedling growth of wheat cultivars under salinity conditions by reducing Na+ in favor of K+ accumulation.

Keywords

Main Subjects


Article Title [Persian]

تاثیر کاربرد سیلیس بر جوانه‌زنی و رشد گیاهچه ارقام گندم تحت شرایط تنش شوری

Authors [Persian]

  • کبری مقصودی
  • یحیی امام
بخش زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ج. ا. ایران.
Abstract [Persian]

چکیده- جوانه­زنی بذر و رشد اولیه گیاهچه از مراحل حساس در استقرار و تولید عملکرد گیاهان زراعی بویژه در شرایط تنش شوری می­باشند. کاربرد سیلیس می­تواند موجب بهبود جوانه­زنی و رشد گیاهچه گردد. این پژوهش با هدف بررسی تاثیر پیش تیمار بذر با سیلیس در غلظت­های مختلف (0، 75/0، 5/1 و 25/2 میلی­مولارسیلیکات سدیم) بر جوانه­زنی و رشد گیاهچه دو رقم گندم کویر (مقاوم به شوری) و شیراز (حساس به شوری) در شرایط تنش کلرید سدیم (0، 100 و 150 میلی­مولار) به صورت فاکتوریل در قالب طرح کاملا تصادفی با سه تکرار در گلخانه پژوهشی دانشکده کشاورزی دانشگاه شیراز  در سال 1391 به اجرا در آمد. نتایج نشان داد که پیش تیمار بذر با سیلیس سبب افزایش درصد جوانه­زنی، سرعت جوانه­زنی، بنیه بذر، طول ریشه­چه و ساقچه و وزن خشک گیاهچه ارقام گندم در هر دو شرایط تنش و عدم تنش شوری گردید و نیز کاهش مدت زمان جوانه­زنی را در هر دو شرایط به همراه داشت. بعلاوه،‏ کاربرد سیلیس موجب افزایش غلظت پتاسیم و نسبت پتاسیم به سدیم و نیز کاهش غلظت سدیم گردید و تاثیر غلظت 25/2 میلی مولار سیلیکات سدیم مشهودتر از سایر غلظت­های به کار رفته بود. در مقابل، تنش شوری سبب کاهش صفات اندازه­گیری شده گردید و افزایش مدت زمان جوانه­زنی و غلظت سدیم را در هر دو رقم به همراه داشت. با این حال، رقم مقاوم به شوری (کویر)، در شرایط تنش، سدیم کمتر و نیز پتاسیم بیشتری را در مقایسه با رقم حساس به شوری (شیراز) در خود تجمع داد. اگر چه با افزایش غلظت NaCl (150 میلی مولار) تاثیر منفی شوری بر پارامترهای اندازه­گیری شده در هر دو رقم بیشتر بود، با این حال، رقم مقاوم کویر تاثیر کمتری از تنش شوری در مقایسه با رقم حساس شیراز پذیرفت. در مجموع می­توان نتیجه­گیری نمود که پیش تیمار بذر با سیلیس می­تواند سبب بهبود جوانه­زنی شود و نیز از طریق افزایش تجمع پتاسیم و کاهش سدیم سبب رشد و در نتیجه استقرار بهتر گیاهچه­های گندم تحت شرایط تنش شوری گردد. 

Keywords [Persian]

  • واژه های کلیدی:
  • گندم
  • سیلیس
  • شوری
  • جوانه‌زنی
  • رشد گیاهچه
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