تأثیر سیلیکات پتاسیم بر ویژگی‌های رشدی، فیزیولوژی و بیوشیمیایی شمعدانی معطر (Pelargonium graveolens) در شرایط تنش شوری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد، دانشکدۀ کشاورزی، دانشگاه لرستان

2 دانشیار، دانشکدۀ کشاورزی، دانشگاه لرستان

چکیده

این پژوهش به‌منظور بررسی تأثیر سیلیکات پتاسیم بر واکنش گیاه شمعدانی معطر به تنش شوری در سال 1393 انجام شد. آزمایش به‌صورت گلدانی، آبکشتی (هیدروپونیک) درون ماسه و بر پایۀ فاکتوریل در قالب طرح کامل تصادفی شامل چهار واحد آزمایشی و هر واحد شامل 9 ترکیب تیماری و درمجموع 36 گلدان انجام شد. عامل‌ها شامل شوری ناشی از کلرید‌سدیم با ایجاد سه سطح هدایت الکتریکی 8/1 (ناشی از محلول غذایی به‌عنوان شاهد، بدون کلرید سدیم)، 4 و 6 دسی‌زیمنس ‌بر ‌متر و کاربرد هفتگی سیلیکات پتاسیم در سه سطح 0، 5/0 و 1 میلی‌مولار بود. نتایج نشان دادند، با افزایش شوری، فراسنجه (پارامتر)های رشد گیاه، میزان اسانس، محتوای نسبی آب و فعالیت آنزیم‌های کاتالاز و پراکسیداز کاهش یافت درحالی‌که میزان مالون‌دی‌آلدئید، نشت الکترولیت‌ها و میزان پرولین افزایش یافتند. سیلیکات پتاسیم در بهبود رشد و ویژگی‌های بیوشیمیایی گیاه در شرایط شوری مؤثر بود. همچنین با افزایش سطح شوری میزان سدیم افزایش پیدا کرد و میزان پتاسیم کاهش یافت و کاربرد سیلیکات پتاسیم باعث کاهش سدیم و افزایش پتاسیم  در اندام‌های هوایی گیاه شد. در بیشتر ویژگی‌ها از جمله سطح برگ، وزن تر و خشک گیاه کاربرد سیلیکات پتاسیم با غلظت 1 میلی‌مولار عملکردی همانند به شاهد را نشان داد. به‌طورکلی نتایج نشان داد، افزایش شوری باعث تشدید تنش شده و کاربرد هفتگی سیلیکات پتاسیم به‌ویژه با غلظت 1 میلی‌مولار باعث کاهش تأثیر تنش شد.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of potassium silicate on growth, physiological and biochemical characteristics of Pelargonium graveolens under salinity stress

نویسندگان [English]

  • Fatemeh Hassanvand 1
  • Abdolhossein Rezaei Nejad 2
1 Former M.Sc. Student, Faculty of Agriculture, Lorestan University, Khorramabad, Iran
2 Associate Professor, Faculty of Agriculture, Lorestan University, Khorramabad, Iran
چکیده [English]

This research was carried out to evaluate the effect of potassium silicate on geranium reaction to salinity stress in 2014. The experiment was done hydroponically in pots filled with sand. Experiment was laid out factorially based on a completely randomized design with four replications each replication included 9 treatment compositions with 36 pots. Factors consisted of daily application of 1.8, 4 and 6 ds/m NaCl and weekly application of 0, 0.5 and 1 mM potassium silicate through nutrient solution. Result showed that by increasing salinity, growth parameters, essential oil, relative water content and the activity of catalase and peroxidase decreased while Malondialdehyde, electrolyte Leakage and amount of proline increased. Application of potassium silicate improved growth and physiological and biochemical characteristics ofgeranium under salinity stress. Moreover, leaf Na increased while P content decreased, respectively, as salinity increased and application of potassium silicate increased P and decreased Na under salinity in canopy of plant. Many characters i.e. leaf area, shoot fresh and dry weights values returned to control as 1mM potassium silicate was applied. Overall, the results showed that increasing salinity pronounced stress symptoms and weekly application of potassium silicate especially at 1 mM, alleviated the stress effects.

کلیدواژه‌ها [English]

  • Catalase
  • Essential oil
  • potassium
  • proline
  • Peroxidase
  • Silicon
  • sodium

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سابقه مقاله

  • تاریخ دریافت: 20 تیر 1395
  • تاریخ بازنگری: 04 شهریور 1395
  • تاریخ پذیرش: 13 شهریور 1395

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