ارزیابی مورفوفیزیولوژیکی چمن آفریقایی تحت تأثیر اسید سالیسیلیک در شرایط تنش کم‌آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد، دانشکدۀ کشاورزی، دانشگاه زنجان

2 استادیار، دانشکدۀ کشاورزی، دانشگاه زنجان

چکیده

اسید سالیسیلیک می­تواند با تغییر در ویژگی­های فیزیولوژیکی و ریخت‌شناختی (مورفولوژیکی) گیاه سبب بهبود تحمل به تنش در گیاهان شود. این پژوهش به‌منظور بررسی پاسخ‌های مورفوفیزیولوژیکی چمن آفریقایی (Cynodon dactylon (L.) Pers) به تنش کم‌آبی و کاربرد اسید سالیسیلیک در سال 1394 در گلخانۀ تحقیقاتی گروه علوم باغبانی دانشگاه زنجان انجام شد. سه سطح آب قابل دسترس خاک (40، 70 و 100 درصد) و اسید سالیسیلیک (0، 1 و 2 میلی مولار) به‌صورت یک آزمایش فاکتوریل در قالب طرح کامل تصادفی در چهار تکرار اعمال شدند. نتایج نشان داد، تنش کم‌آبی (40 درصد آب قابل دسترس)محتوای نسبی آب برگ و رشد شاخساره را کاهش داد. درصورتی‌کهرشد ریشه، نسبت ریشه به شاخساره، ظرفیت پاداکسندگی (آنتی‌اکسیدانی)، نشت یونی، پرولین، فنل کل و میزانسبزینۀ (کلروفیل) برگ‌ها با کاهش آب قابل دسترس خاک افزایش یافت. کاربرداسید سالیسیلیک از راه افزایشظرفیت پاداکسندگی، میزان پرولین و سبزینۀ برگ‌ها و همچنین کاهش نشت یونی، تأثیر منفی تنش کم‌آبی را بهبود بخشید و این تأثیر در غلظت 2 میلی­مولار واضح‌تر بود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Morphophysiologycal evaluation of Bermuda grass under salicylic acid treatment in water deficit conditions

نویسندگان [English]

  • Soheila Taheri 1
  • Masoud Arghavani 2
  • Seyed Najmadin Mortazavi 2
1 Former M. Sc. Student, Faculty of Agriculture, University of Zanjan, Iran
2 Assistant Professor, Faculty of Agriculture, University of Zanjan, Iran
چکیده [English]

Salicylic acid can improve plant stress tolerance by changing physiological and morphological characteristics of plants. This experiment was conducted in order to investigate morphophysiologycal responses of Bermuda grass (Cynodon dactylon (L.) Pers.) to water deficit stress and salicylic acid application in Research greenhouses of horticultural science department at the University of Zanjan in 2015. Three soil available water levels (40, 70 and 100%) and salicylic acid (0, 1 and 2 millimolar) were applied in a factorial experiment based on completely randomized design with four replications. Results showed that water deficit (40 % available water) reduced leaves relative water content and shoot growth whereas, root growth, root to shoot ratio, leaves antioxidant capacity, electrolyte leakage, proline, total phenol and chlorophyll content increased with decreasing soil available water. Salicylic acid application ameliorate adverse effects of water deficit in bermuda grass by increasing leaves antioxidant capacity, proline, and chlorophyll content as well as reducing electrolyte leakage and this effect was more pronounced in concentration of 2 mM.

کلیدواژه‌ها [English]

  • Available water
  • Chlorophyll
  • proline
  • shoot growth
  • total phenol

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سابقه مقاله

  • تاریخ دریافت: 20 آذر 1395
  • تاریخ بازنگری: 10 مرداد 1396
  • تاریخ پذیرش: 08 اسفند 1395

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