نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد زراعت، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری - ایران

2 دانشیار گروه زراعت، پژوهشکده ژنتیک و زیست فناوری کشاورزی طبرستان، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری - ایران

3 دانشجوی دکتری زراعت، دانشگاه کشاورزی و منابع طبیعی رامین خوزستان، اهواز - ایران

4 استادیار پژوهشکده ژنتیک و زیست فناوری کشاورزی طبرستان، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری - ایران

چکیده

به منظور بررسی اثر همزیستی قارچ­ Piriformospora indica بر سیستم آنتی­اکسیدانی و رنگیزه­های فتوسنتزی گیاه دارویی استویا تحت تنش شوری، آزمایشی به صورت فاکتوریل در قالب طرح کاملاً تصادفی با چهار تکرار در شرایط درون­شیشه­ای انجام شد. عامل­های آزمایش شامل تنش شوری در شش سطح (صفر، 50، 100، 150، 200 و 250 میلی­مولار NaCl) و تیمار همزیستی قارچی در دو سطح عدم تلقیح و تلقیح قارچ P. indica بود.روند تغییرات غلظت پراکسید­هیدروژن، مالون­دی­آلدهید و فعالیت آنزیم کاتالاز در تیمار شاهد به صورت خطی و افزایشی و در تیمار تلقیح با قارچ به صورت دوتکه­ای بود، به­طوری­که در تیمار تلقیح در سطوح پایین تنش این میزان کاهش یافت. روند تغییرات کلروفیلa ، b و کلروفیل a+b در هر دو تیمار عدم تلقیح و تلقیح قارچ به صورت معادله­ی دو­تکه­ای بود. با این وجود، محتوای کاروتنوئید با افزایش تنش شوری در تیمار تلقیح و عدم تلقیح به صورت خطی (به‌ترتیب با شیب 007/0- و 005/0-) کاهش یافت.در مجموع، نتایج نشان داد که قارچ P. indicaدر سطوح پایین شوری احتمالاً از طریق کاهش غلظت پراکسید­هیدروژن (دو درصد تا سطح 124 میلی­مولار شوری) و مالون­دی­آلدهید (17 درصد تا سطح 50 میلی‌مولار شوری) و درنتیجه کاهش فعالیت آنزیم­های آنتی­اکسیدانی و بهبود میزان رنگیزه­های فتوسنتزی سبب افزایش نسبی تحمل به تنش در گیاهان تلقیح شده نسبت به گیاهان شاهد شد.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of antioxidant enzymes activity and photosynthetic pigments content changes of stevia medicinal plant inoculated with Piriformospora indica fungi under salt stress

نویسندگان [English]

  • Zahra Noori Akandi 1
  • Hemmatollah Pirdashti 2
  • Yaser Yaghoubian 3
  • Valiollah Ghasemi Omran 4

1 M.Sc. Student of Agronomy, Sari Agricultural Sciences and Natural Resources University, Sari - Iran

2 Associate Professor, Department of Agronomy, Genetics and Agricultural Biotechnology Institute of Tabarestan, Sari Agricultural Sciences and Natural Resources University, Sari – Iran

3 Ph.D. Student of Agronomy, Ramin Agricultural Sciences and Natural Resources University of Khouzestan, Ahvaz - Iran

4 Assistant Professor, Department of Agronomy, Genetics and Agricultural Biotechnology Institute of Tabarestan, Sari Agricultural Sciences and Natural Resources University, Sari - Iran

چکیده [English]

In order to evaluate the effect of Piriformospora indica fungi inoculation on antioxidant systems and photosynthetic pigments of Stevia under salt stress, an experiment was conducted in a factorial based completely randomized design with four replications under in vitro culture conditions. Factors include salinity at six levels (0, 50, 100, 150, 200 and 250 mM of NaCl) and inoculation of mycorrhizae like fungi at two levels (non-inoculated and inoculation with fungi). The results showed that the hydrogen peroxide (H2O2) and malondialdehyde (MDA) concentration and catalase (CAT) activity was increased linearly in control plants while in inoculated plants fitted by a segmented equation. Accordingly, in mild stress the activity of these enzymes were reduced. Chlorophyll a, b and a+b content changed as a segmented model in both inoculated and uninoculated plants. Carotenoid content, however, linearly decreased in both inoculated (slope of -0.007) and uninoculated (slope of -0.005) plants. In conclusion, the results indicated that P. indica, particularly in low levels of salt stress, could reduce hydrogen peroxide (by two percent up to 124 mM of NaCl) and malondialdehyde content (17 percent up to 50 mM of NaCl) which resulted in decreased antioxidant activities and improved photosynthetic pigments and relatively increased tolerance to salt stress  in stevia plants.

کلیدواژه‌ها [English]

  • Antioxidant Enzymes
  • Catalase
  • Chlorophyll
  • endophytic fungi
  • Malondialdehyde
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