تأثیر کاربرد سیلیسیوم بر صفات فیزیولوژیکی و رشد گندم (Triticum aestivum L.) تحت شرایط تنش خشکی آخر فصل

نوع مقاله : علمی - پژوهشی

نویسندگان

دانشکده کشاورزی و منابع طبیعی، دانشگاه رامین

چکیده

به‏منظور بررسی تأثیر سطوح مختلف سیلیسیوم بر برخی صفات فیزیولوژیکی و رشد گندم نان (Triticum aestivum L.) در شرایط تنش خشکی آخر فصل، آزمایشی گلدانی در سال 1391 به صورت فاکتوریل در قالب بلوک‏های کامل تصادفی با سه تکرار اجرا گردید. در این آزمایش تیمارها شامل سطوح تنش خشکی آخر فصل (آبیاری پس از تخلیه 25، 50 و 75 درصد رطوبت قابل استفاده خاک) و سطوح سیلیسیوم (صفر، 10، 20 و 30 میلی‏گرم سیلیس خالص در کیلوگرم خاک) می‏باشد. نتایج نشان داد که اثر خشکی بر تمام صفات مورد بررسی معنی‏دار بود، به طوری که در اثر تنش میزان نشت الکترولیتی، مقدار پرولین، موم کوتیکول و غلظت سیلیسیوم برگ افزایش و فعالیت آنزیم سوپراکسید دیسموتاز، پتاسیم دانه و نسبت اندام هوایی به ریشه کاهش یافتند. تنش خشکی شدید بیشترین تأثیر را بر میزان نشت (افزایش 53 درصد) داشت. کاربرد سیلیسیوم نیز به جز نسبت اندام هوایی به ریشه تمام صفات مورد بررسی را تحت تأثیر خود قرار داد، به نحوی که کاربرد 30 میلی‏گرم سیلیسیوم سبب کاهش 5/22 درصدی میزان نشت و افزایش پرولین، فعالیت آنزیم سوپراکسید دیسموتاز، موم موتیکول، غلظت پتاسیم دانه و سیلیسیوم برگ به ترتیب 25، 8/12، 21، 17 و 30 درصد نسبت به شاهد گردید. به‏طورکلی، نتایج نشان داد که تأثیر مثبت سیلیسیوم بر گندم در شرایطی که گیاه تحت تنش قرار داشت بسیار بیشتر از شرایط بدون تنش است.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of silicon application on physiological characteristics and growth of wheat (Triticum aestivum L.) under drought stress condition

نویسندگان [English]

  • A. Karmollachaab
  • M.H. Gharineg
  • A. Bakhshandeh
  • M. Moradi Telvat
  • G. Fathi
Ramin Agriculture and Natural Resources University
چکیده [English]

In order to investigate the effect of silicon application on some physiological characteristics and growth of Wheat (Triticum aestivum L.) under late drought stress condition, an experiment was conducted at the Agriculture and Natural Resources University of Ramin, Khuzestan during year 2012. The experiment was conducted in the open environment as factorial randomized complete block design with three levels of drought stress (irrigation after 25, 50 and 75% depletion of available water content) as the first factor and four levels of silicon (0, 10, 20 and 30 mg Si.kg-1 soil) as the second factor with three replications. The results showed that drought stress imposed a negative significant effect on all traits. The drought stress led to increased electrolyte leakage and proline content, cuticular wax, leaf silicon concentration, superoxide dismutase activity (SOD) and grain potassium were decreased. The severe drought stress has most effect on electrolyte leakage (up to 53%). The application of silicon except the shoot/root parameter, on all characters have been affected so that application of 30 mg Si.kg-1 soil led to decrease electrolyte leakage up to 22.5% and increased SOD activity, proline content, cuticular wax grain K and flag leaf Si concentration, 25, 12.8, 21, 17 and 30% compared to control, respectively. In general, the results showed a positive effect of silicon on wheat plant under stress conditions that were higher than no stress condition.

کلیدواژه‌ها [English]

  • Electrolyte leakage
  • Silicon k concentration
  • Superoxide dismutase activity
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