بررسی کارایی سالسیلیک اسید برفتوسنتز، تبادلات گازی و تعدیل تنش خشکی در کدوی طبی (Cucurbita pepo var. styriaca)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 هیت علمی/ دانشگاه تبریز

2 دانشگاه تبریز، دانشکده کشاورزی، گروه علوم باغبانی

3 پژوهشکده فناوریهای نوین زیستی دانشگاه زنجان

4 دانشجوی سابق گروه علوم باغبانی، دانشکده کشاورزی، دانشگاه تبریز

چکیده

اهداف: سالیسیلیک اسید یک ترکیب فنلی است که به عنوان تنظیم کننده رشد نقش مهمی در القا مقاومت به خشکی در گونه-های مختلف گیاهی دارد. در این مطالعه، اثر محلول‌پاشی سالیسیلیک اسید بر میزان کلروفیل، محتوی نسبی آب، تجمع ترکیبات اسمولیتی و عملکرد میوه و دانه گیاه کدوی طبی تحت سطوح مختلف تنش خشکی بررسی شد.
مواد و روش‌ها: تیمارهای آزمایش شامل محلول‌پاشی برگی سالیسیلیک اسید در 4 سطح (صفر (محلول‌پاشی با آب مقطر)، 5/0، 1 و 5/1 میلی‌گرم در لیتر) و تنش خشکی در 4 سطح (ظرفیت زراعی آبیاری کامل، 85 درصد ظرفیت زراعی، 70 درصد ظرفیت زراعی و 55 درصد ظرفیت زراعی) بودند.
یافته‌ها: بر اساس نتایج حاضر با افزایش تنش خشکی مقدار کلروفیل، هدایت روزنه‌ای، سرعت تعرق، سرعت فتوسنتز و محتوای آب برگ به‌طور معنی‌داری کاهش یافت در‌حالی‌که تنش خشکی مقدار پرولین و کربوهیدرات محلول را افزایش داد. این تغییرات همراه با کاهش عملکرد میوه و بذر کدو طبی بود به‌طوری‌که کمترین عملکرد تحت تنش شدید خشکی (55 درصد ظرفیت زراعی) حاصل شد. محلول‌پاشی سالسیلیک اسید از طریق افزایش تجمع ترکیبات اسمولیتی و پروتئین منجر به تعدیل اثرات تنش خشکی و بهبود وضعیت آبی گیاه، فتوسنتز و عملکرد میو و بذر گردید.
نتیجه‌گیری: بر اساس نتایج حاضر، استفاده از 1 میلی‌گرم در لیتر سالیسیلیک اسید جهت بهبود عملکرد گیاه کدو طبی به‌ویژه در شرایط تنش خشکی قابل توصیه می‌باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of salicylic acid efficacy on photosynthesis, gas exchange and adjustment of drought stress on medicine pumpkin (Cucurbita pepo var. Styriaca)

نویسندگان [English]

  • jaber panahandeh 1
  • Sahebali Boland nazar 2
  • Hossein Rabbi Angourani 3
  • Nasrin Farhadi 4
2 Dept. of Hortcultural Science, Faculty of Agriculture, University of Tabriz
3 Research Institue of Modern Biological Techniques, University of Zanjan, Zanjan, Iran
4 Dept of Horticultural Science, faculty of Agriculture, University of Tabriz
چکیده [English]

Background & Objective: Salicylic acid is a phenolic compound that plays an important role in inducing drought resistance in various plant species as a growth regulator.
Methods & Materials: In this study, the effect of foliar application of salicylic acid on chlorophyll content, relative water content, accumulation of osmotic compounds and fruit and seeds yield of medicine pumpkin under different levels of drought stress was investigated. Experimental treatments were included the foliar application of salicylic acid at 4 levels (control (spray with distilled water), 0.5, 1 and 1.5 mg L-1) and drought stress at 4 levels (100% field capacity, 85% field capacity, 70% field capacity and 55% field capacity).
Results: According to the present results, with increasing drought stress, chlorophyll content, stomatal conductance, transpiration rate, photosynthesis rate and leaf water content significantly decreased, however drought stress increased the amount of proline and soluble carbohydrates. These changes were accompanied by a reduction of fruit and seed yield of medicine pumpkin, so that the lowest yield was achieved under severe drought stress (55% of field capacity). Foliar application of salicylic acid by enhancing the accumulation of osmotic and protein compounds led to the mitigation of the drought stress and improved plant water status, photosynthesis and fruit and seed yield.
Conclusion: Based on the present results, the use of 1 mg L-1 salicylic acid is recommended to improve the yield of medicine pumpkin especially under drought stress condition.

کلیدواژه‌ها [English]

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