اثر سالیسیلیک اسید بر کاهش اثرهای منفی تنش خشکی در گیاه همیشه بهار (Calendula officinalis L.)

نویسندگان

1 استادیار، گروه تولیدات گیاهی، دانشکده کشاورزی بردسیر، دانشگاه شهید باهنر کرمان، کرمان

2 -

چکیده

برای بررسی تأثیر سطوح مختلف تنش خشکی بر برخی شاخص‏های رشدی و بیوشیمیایی گیاه همیشه بهار در شرایط گلخانه و استفاده از سالیسیلیک اسید برای تعدیل اثرات تنش خشکی، آزمایشی به‏صورت فاکتوریل در پایه طرح کاملاً تصادفی با سه تکرار در گلخانه تحقیقاتی دانشکده کشاورزی بردسیر، دانشگاه شهید باهنر کرمان در سال 1393 اجرا شد. تیمارهای آزمایش شامل خشکی در چهار سطح (آبیاری مطلوب در حد ظرفیت مزرعه‏ای و آبیاری در 75، 50 و 25 درصد ظرفیت مزرعه‏ای) و سالیسیلیک اسید در چهار سطح (0، 5/0، 1، 5/1 و 2 میلی‏مولار) بود. نتایج نشان داد که سطوح آبیاری تأثیرمعناداریرا بر کلیه صفات مورد بررسی داشت. صفات وزن خشک،غلظت کارتنوئید، پرولین و قندهای محلول تحت تأثیرمعنا‏دار تیمار سالیسیلیک اسید قرار گرفتند. برهم‏کنش آبیاری و سالیسیلیک اسید تأثیرمعنا‏داری بر وزن خشک بوته، غلظت پرولین و قندهای محلول نشان داد. نتایج نشان داد که افزایش شدت تنش خشکی باعث کاهش معنا‏دار شاخص‏های رشد و همچنین غلظت کلروفیل a و b شد. غلظت کارتنوئید، قندهای محلول، پرولین و میزان فنل کل با کاهش آب آبیاری افزایش معنا‏داری یافتند. افزایش سطوح سالیسیلیک اسید تا 5/1 میلی‏مولار باعث افزایش معنا‏دار وزن خشک گیاه،غلظت کارتنوئید و قندهای محلول نسبت به شرایط عدم محلول‏پاشی شد. امادر غلظت 2 میلی‏مولار میزان این صفات نسبت به شاهد کاهش یافت. به‏طورکلی، نتایج نشان داد که کاربرد سالیسلیک اسید به‏ویژه سطح 5/1 میلی‏مولار نقش مثبتی در تعدیل اثرات منفی تنش خشکی نشان داد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Salicylic acid Application on Mitigating Impacts of Drought Stress in Marigold (Calendula officinalis L)

نویسندگان [English]

  • R Moradi 1
  • N Pourghasemian 2
1 Assist. Prof.,Dept. of Plant Prod., Agric. Faculty of Bardsir, Shahid Bahonar Univ., of Kerman, Iran
2 -
چکیده [English]

In order to evaluate the effect of various levels of drought stress on some growth and bio-chemical parameters of marigold (Calendula officinalis L.) and application of salicylic acid for mitigating drought impacts under greenhouse conditions, an experiment was conducted with a factorial arrangement based on completely randomized design with three replications at Research Greenhouse of Agricultural Faculty of Bardsir, Shahid Bahonar University of Kerman in 2015. The experimental treatments were different levels of drought stress at four levels (irrigation for fulfill of 100%, 75%, 50% and 25% of the field capacity) and foliar-application of salicylic acidat at five levels (0, 0.5, 1, 1.5 and 2 mM). The results showed that the irrigation levels had significant effect on all studied traits. The traits of dry weight, carotenoid contents, proline contents and soluble sugars were significantly affected by the salicylic acid treatment. Interaction of the irrigation and salicylic acid had significant effect on dry weight, proline contents and soluble sugars. The results showed that increase in drought stress caused to significant decreasing in growth parameters and also chlorophyll a and b contents. Contents of carotenoid, soluble sugars, proline and phenol were significantly increased by decreasing amount of irrigation water. Increase of salicylic acid to 1.5 mM increased the plant dry weight, carotenoid contents and soluble sugars relative to the control conditions. 2 mM salicylic acid decreased the traits compared to non- foliar application. Generally, the results showed that application of salicylic acid specially in 1.5 mM had a positive role in mitigation of negative effects of drought stress.   

کلیدواژه‌ها [English]

  • Carotenoid
  • Chlorophyll
  • Proline
  • Phenol
  • Soluble sugar
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