بررسی اثر تنش شوری بر جوانه‌زنی بذر 18 رقم گندم (Triticum aestivum L.)

نوع مقاله: پژوهشی

نویسندگان

1 گروه زیست‌شناسی، دانشکده علوم، دانشگاه اصفهان، ایران

2 گروه زیست شناسی، دانشکده علوم، دانشگاه اصفهان، ایران

3 گروه زیستشناسی، دانشکده علوم، دانشگاه اصفهان، ایران

چکیده

          شوری یکی از مهمترین تنش‌های محیطی است که موجب خسارت شدید به محصولات باغی و زراعی و همچنین کاهش تنوع زیستی در گیاهان می‌گردد. مقاومت به ‌شوری در طول جوانه‌زنی و رشد اولیه دانه رست‌ها در مورد 18 رقم گندم (Triticum aestivumL.؛ شامل ارقام بومی، غیر بومی و هیبرید) در چهار سطح کنترل، 100، 200 و 250 میلی‌مولار کلرور سدیم مورد بررسی قرار گرفت. این آزمایش، به‌صورت فاکتوریل در قالب طرح کاملاً تصادفی و با سه تکرار تصادفی در آزمایشگاه تحقیقاتی گروه زیست شناسی دانشگاه اصفهان در سال 1394 انجام شد. نتایج نشان داد که با افزایش سطح شوری در محیط کاشت، شاخص‌های مختلف جوانه‌زنی با شدت بیشتری تحت تاثیر قرار گرفت. مقایسه میانگین صفات نشان داد که ارقام مختلف گندم واکنش‌های متفاوتی داشتند. این ارقام از نظر مقاومت به شوری طبقه‌بندی شده و ارقام سرخ تخم، هامون، سیوند،، بزوستایا، سپاهان و روشن در گروه مقاوم و ارقام قدس، گاسپارد، کرج و نوید در گروه حساس و پایین دندروگرام قرار گرفتند. سرخ تخم و قدس از نظر شاخص استرس جوانه‌زدنی (GSI) و شاخص تحمل شوری (STI) به‌ترتیب بیشترین و کمترین میزان شاخص را نشان داده بودند. همچنین دیده شده که تیمارهای مختلف شوری اثر قابل توجهی بر درصد جوانه‌زنی، سرعت جوانه‌زنی، طول ریشه‌چه و ساقه‌چه و همچنین وزن خشک ریشه و ساقه در تمام ارقام مورد مطالعه داشته است. تمام متغیرهای اندازه‌گیری شده با افزایش سطح شوری کاهش معنی‌داری نشان دادند.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of salinity stress effect on germination of 18 strains wheat (Triticum aestivum L.)

نویسندگان [English]

  • Mahboobeh Riahi 1
  • Akbar Mostajeran 2
  • Mehran Miroliaei 3
1 Department of Biology, Faculty of Sciences, University of Isfahan, Isfahan, Iran
2 Department of Biology, Faculty of Sciences, University of Isfahan, Isfahan
3 Department of Biology, Faculty of Sciences, University of Isfahan, Isfahan, Iran
چکیده [English]

Salinity is a major environmental stress that causes severe damage to crops and horticultural crops and also reduces plant biodiversity. In order to study the resistance to salinity during seed germination and early growth, 18 strains of wheat cultivars (Triticum aestivum L.; Including car, non-indigenous and hybrid carcasses) were investigated at four levels of control, 100, 200 and 250 mM sodium chloride. The experiments were conducted with a complete randomized block design in three replications in the research laboratory of department of Biology, University of Isfahan, 2015. The results showed that with increasing NaCl level in the culture media, germination indices were affected with more intense. Comparison of mean traits showed that different cultivars of wheat had different reactions. These cultivars were classified in two groups, so that Sorghtoghm, Hamon, Sivand, Bezostaya, Sepahan and Roshan were placed in resistant groups and Ghods, Guspard, Karaj and Navid cultivars were placed in sensitive and low dendrogram groups. Sorghtoghm and Ghods were shown to have the highest and lowest index for germination stress index (GSI) and salinity tolerance index (STI) respectively. The results showed that the different levels of salinity had significant effects on germination percent, germination rate, seedlings stem and root length, root, and shoot dry weight. All measured variables showed a significant decrease with increasing salinity level.

کلیدواژه‌ها [English]

  • dry weight
  • germination
  • salinity tolerance
  • Salt stress
  • Wheat
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