اثر اسید هیومیک بر رشد و برخی پاسخ‌های فیزیولوژیکی چمن آفریقایی (‏Cynodon dactylon L.‎‏) ‏تحت تنش شوری

نوع مقاله: مقاله کامل

نویسندگان

1 دانشجوی دکتری، دانشکده کشاورزی و صنایع غذایی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 استاد، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران

3 دانشیار، دانشکده کشاورزی، دانشگاه ایلام، ایلام، ایران

4 استادیار، دانشکده کشاورزی و صنایع غذایی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

10.22059/ijhs.2018.249383.1375

چکیده

به منظور بررسی تأثیر اسید هیومیک بر رشد و برخی پاسخ­های فیزیولوژیکی چمن آفریقایی تحت تنش شوری، آزمایشی به صورت فاکتوریل در قالب طرح کاملاً تصادفی انجام شد. عامل اول اسید هیومیک در چهار سطح (صفر، 50، 100 و 150 میلی‌گرم در لیتر به‌صورت کاربرد خاکی) و عامل دوم تنش شوری در چهار سطح (صفر، 5، 7 و 9 دسی‌زیمنس بر متر) بود. نتایج تجزیه واریانس نشان داد اثر شوری و اسید هیومیک بر پارامترهای رشدی، رنگیزه­های فتوسنتزی، مالون دی­آلدهید، پرولین و آنزیم‌های آنتی‌اکسیدان معنی‌دار بود. در شرایط تنش شوری، وزن تر و خشک شاخساره و ریشه، سطح برگ و کلروفیل کاهش، اما پرولین و فعالیت مالون دی آلدیید کاتالاز و سوپر اکسید دیسموتاز افزایش یافت. کاربرد اسید هیومیک سبب افزایش پارامترهای رشدی، محتوای کلروفیل، کاتالاز و پراکسیداز شد و تحمل شوری در گیاه را افزایش داد. با افزایش غلظت اسید هیومیک اثربخشی آن افزایش یافت، به‌طوری‌که بالاترین تأثیر در غلظت 150 میلی‌گرم در لیتر اسید هیومیک مشاهده شد. به‌طورکلی، نتایج نشان داد کاربرد اسید هیومیک با بهبود فرآیندهای فیزیولوژیک گیاه می‌تواند به‌طور مؤثری برای حفاظت چمن از اثرهای شوری بالا استفاده شود. 

کلیدواژه‌ها


عنوان مقاله [English]

The effect of humic acid on growth and some physiological responses in bermuda ‎grass subjected to salinity stress

نویسندگان [English]

  • Reza Sharifiasl 1
  • Mohsen Kafi 2
  • Mehdi Saidi 3
  • Sepide Kalatejari 4
1 Ph.D. Candidate, Faculty of Agriculture and Food Industries, Science and Research Branch, Islamic Azad University Tehran, Iran ‎
2 Professor, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran ‎
3 Associate Professor, Faculty of Agriculture, Ilam University, Ilam, Iran ‎
4 Assistant Professor, Faculty of Agriculture and Food Industries, Science and Research Branch, Islamic Azad University Tehran, ‎Iran ‎
چکیده [English]

In order to investigate effect of humic acid (HA) on growth and some physiological parameters of bermuda grass under salinity stress, a factorial experiment was cinducted. The first factor was humic acid at four levels ( 0, 50, 100 and 150 mg/l )  and the second factor was salinity at  four levels (0, 5, 7 and 9 ds/m ).  Results of variance analysis showed significant effects of the salinity and HA on plant growth parameters, photosynthetic pigments, malondialdehyde (MDA), proline and antioxidant enzyme activity. Results showed that salinity stress imposed negative effects on plant growth and productivity. In salinity conditions, fresh and dry weight, leaf area and photosynthetic pigments reduced, but proline, malondialdehyde, catalase and superoxide dismutase activities increased. HA application improved growth parameters and increased chlorophyll content, catalase and superoxide dismutase activities of bermuda grass subjected to salinity and provided significant protection against salinity stress compared to non-HA-treated plants. The highest salinity tolerance was obtained with 150 mg/l HA application. In general, the results indicated that HA application, by altering in some tolerant responses, could be effectively used to protect plants from the adverse effects of high salt concentration.

کلیدواژه‌ها [English]

  • Chlorophyll
  • Malondialdehyde
  • oxidative stress
  • proline
  • superoxide dismutase‎
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