بررسی بیان نسبی ژن‌های مرتبط با تنش ناشی از سمیت آهن در دو واریته از گیاه برنج (Oryza sativa)

نوع مقاله : علمی پژوهشی

نویسندگان

1 کارشناس‌ارشد، گروه بیوتکنولوژی کشاورزی، دانشکده علوم کشاورزی، دانشگاه گیلان، رشت، ایران

2 استادیار، گروه بیوتکنولوژی کشاورزی، دانشکده علوم کشاورزی، دانشگاه گیلان، رشت، ایران

3 استاد، گروه بیوتکنولوژی کشاورزی، دانشکده علوم کشاورزی، دانشگاه گیلان، رشت، ایران

چکیده

سمیت آهن سبب افزایش تولید رادیکال‌های آزاد، تنش اکسیداتیو و کاهش شدید عملکرد برنج می‌شود. یکی از پاسخ‌های گیاه برای تنظیم شرایط فیزیولوژیکی و بیوشیمیایی به تنش‌ها، تغییر در محتوای آنتی اکسیدان است. در این پژوهش اثر پنج تیمار آهن (FeEDTA) ( صفر، 100، 250، 400 و 500 میلی‌گرم در لیتر) بر بیان نسبی ژن‌های گلوتاردوکسین (GRX)، تیوردوکسین (TRX)، پروکسی‌ردوکسین (PRX) و کاتالاز (CAT) با استفاده از تکنیک Real time-PCR در دو ژنوتیپ Pokkali (متحمل) و IR64 (حساس) برنج در شرایط هیدروپونیک محلول یوشیدا مطالعه شد. نتایج نشان داد میزان بیان نسبی ژن CAT در سطوح مختلف تنش در ژنوتیپ Pokkali بیش‌تر از IR64 بود. میزان بیان نسبی ژن PRX در ژنوتیپ IR64 در تمامی سطوح تنش تقریباً مشابه بود. با افزایش سطح تنش میزان بیان نسبی ژن TRX در ژنوتیپ Pokkali تفاوت معناداری نداشت. بیان نسبی ژن GRX در ژنوتیپ Pokkali در اکثرسطوح تنش بیش‌تر از IR64 بود. اعمال سطوح کم تنش سبب افزایش بیان CAT، GRX و TRX در ژنوتیپ IR64 شد، اما با افزایش سطح تنش تفاوت معناداری در بیان ژن‌ها ایجاد نشد. این درحالی است که در اکثر سطوح تنش میزان بیان نسبی ژن‌های مورد بررسی در ژنوتیپ Pokkali بیش‌تر از IR64 بود. احتمالاً عدم تغییر بیان نسبی ژن‌ها در سطوح بالای تنش و کم‌تر بودن میزان بیان در ژنوتیپ IR64 یکی از دلایل حساسیت این ژنوتیپ به تنش آهن است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of relative expression of some genes related to iron-induced toxicity in two varieties of Rice (Oryza sativa)

نویسندگان [English]

  • Rasool Vahedi 1
  • Mohammad Mohsenzadeh Golfazani 2
  • Maryam Pasandideh Arjmand 1
  • Habibollah Samizadeh Lahiji 3
1 M.Sc., Department of Agricultural Biotechnology, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran.
2 Assistant Professor. Department of Agricultural Biotechnology, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran.
3 Professor, Department of Agricultural Biotechnology, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran.
چکیده [English]

Iron toxicity lead to increasing of free oxygen radicals, oxidative stresses and sever yield reduction of Rice. One of the plant responses for physiochemical and biochemical regulation to stresses is change of antioxidant enzyme contents. In this study the effect of five treatments of iron (Fe-EDTA) (0, 100, 250, 400 and 500 mg/li-1) on relative expression of glutaredoxin (GRX), thioredoxin (TRX), peroxiredoxin (PRX) and catalase (CAT) genes of IR64 (susceptible) and Pokkali (tolerant) genotypes of Rice in Yoshida hydroponic media by Real time-PCR technique investigated. The results showed that the relative expression level of CAT gene in different levels of iron in Pokkali genotype was higher than IR64 genotype. The relative expression level of PRX in IR64 genotype in all of the levels was similar. The relative expression level of TRX in Pokkali genotype was not significant. The relative expression level of GRX in the most of stress levels in Pokkali genotype was higher than IR64 genotype. Low level iron result in increasing of relative expression level of CAT, GRX and TRX in IR64 genotype. But with increasing level of iron was not significant change in expression of genes. Also in the most of the iron level relative expression of genes in Pokkali was higher than IR64. Probably lose of change in gene expression levels in high level iron and low gene expression in IR64 is one of the reasons of its susceptibility to iron stress.

کلیدواژه‌ها [English]

  • Peroxiredoxin
  • Thioredoxin
  • Catalase
  • IR64
  • Pokkali

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