تاثیر غلظت‌های مختلف سالیسیلیک اسید در تعدیل اثرات تنش کلرید سدیم بر روی پارامترهای رشد و رنگدانه‌های فتوسنتزی در گیاه آفتابگردان (Helianthus annuus L.)

نوع مقاله: پژوهشی

نویسنده

گروه زیست‌شناسی، دانشکده علوم، دانشگاه پیام نور، تهران، ایران.

چکیده

شوری خاک یک مسئله محیطی جدی است که آثار منفی بر رشد و تولید گیاهان دارد. از سوی دیگر سالیسیلیک اسید نقش مهمی در جلوگیری از آسیب‌های اکسیداتیو در گیاهان دارد، که به واسطه سم‌زدایی رادیکال‌های سوپراکسید در نتیجه شوری تولید می‌شود. در این تحقیق اثر غلظت‌های مختلف سالیسیلیک اسید، کلرید سدیم و اثرات توأم سالیسیلیک اسید و کلرید سدیم بر پارامترهای مورفولوژیکی و بیوشیمیایی در گیاهان آفتابگردان مورد مطالعه قرار گرفت. کلرید سدیم با غلظت‌های 0، 25، 50، 75 و 100 میلی‌مولار کلرید سدیم و سالیسلیک اسید با غلظت‌های 0، 5/0، 1 و 5/1 میلی‌مولار در یک طرح کاملاً تصادفی به صورت فاکتوریل مورد استفاده قرار گرفتند. نتایج حاصل از این تحقیقات نشان داد که کلرید سدیم باعث کاهش رشد ساقه، ریشه، وزن تر و خشک، کلروفیل و کاروتنوئید می‌شود، در حالی که در گیاهان پیش تیمار شده با سالیسیلیک اسید این کاهش تعدیل شده است. از طرف دیگر افزایش مقدار آنتوسیانین‌، کلروفیل و کاروتنوئید نشان دهنده نقش سالیسیلیک اسید بر افزایش تحمل پذیری این گیاه در برابر تنش کلرید سدیم است. نتایج فوق پیشنهاد می‌کند که کاربرد سالیسیلیک اسید باعث افزایش تحمل‌پذیری گیاه در برابر تنش کلرید سدیم می شود.

کلیدواژه‌ها


عنوان مقاله [English]

The effect of various concentrations salicylic acid on mitigation of sodium chloride stress in growth parameters and photosynthetic pigments of sunflower plant (Helianthus annuus L.)

نویسنده [English]

  • Kobra Mahdavian
Department of Biology, Faculty of Science, Payame Noor University, Tehran, Iran.
چکیده [English]

S
Soil salinity is a serious environmental problem that has negative effect on plants’ growth and production. On the other hand, salicylic acid plays an essential role in preventing oxidative damage in plants by detoxifying superoxide radicals produced as a result of salinity. In this research the effect of different concentrations of salicylic acid, sodium chloride, and interaction effects of both factors were studied on morphological and biochemical parameters in sunflower (Helianthus annuus L.) plants. NaCl concentrations of 0, 25, 50, 75, and 100 mM and salicylic acid concentrations of 0, 0.5, 1, and 1.5 mM were used in the form of a factorial experiment in a complete randomized design (CRD). Results showed that salinity caused significant decrease in shoot and root length, fresh and dry weights, chlorophylls, and carotenoid of plants while in salicylic acid pre-treated plants, this reduction has been moderated. On the other hand, increasing the amount of anthocyanin, chlorophylls, and carotenoid indicated the role of salicylic acid in increasing the tolerance of this plant to sodium chloride stress. These findings suggest that salicylic acid application increases plant tolerance to sodium chloride stress.

کلیدواژه‌ها [English]

  • Anthocyanin
  • Chlorophyll
  • Helianthus annuus L
  • Salicylic Acid
  • Sodium chloride
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