بیان ژن‌های خانواده CYP دخیل در سنتز سزامین در دانه ارقام مختلف کنجد (Sesamum indicum L)

نوع مقاله : علمی پژوهشی

نویسندگان

1 کارشناس ارشد بیوتکنولوژی کشاورزی، دانشکده کشاورزی و منابع طبیعی، دانشگاه بین المللی امام خمینی(ره)، قزوین، ایران

2 استادیار گروه بیوتکنولوژی کشاورزی، دانشکده کشاورزی و منابع طبیعی، دانشگاه بین المللی امام خمینی(ره)، قزوین، ایران

چکیده

کنجد (L. Sesamum indicum) با داشتن مقادیر زیاد آنتی‌اکسیدان و متابولیت ثانویه منبع تغذیه‌ای مهمی در تامین و حفظ سلامت انسان است. اهمیت ویژه دانه کنجد به‎دلیل وجود آنتی‌اکسیدان طبیعی مهمی به نام سزامین است. به‎دلیل کاربرد این آنتی‌اکسیدانت در پیشگیری از بروز بیماری‌ها به‎خصوص سرطان‌ها تلاش‌های زیادی در راستای شناخت ییشتر ژن‌های دخیل در مسیر بیوسنتز این ماده و افزایش سطح بیان ژن‌های رمز کننده آنزیم‌های مربوطه انجام شده است. در این مطالعه سطح بیان ژن‌های کلیدیCYP81Q1 ،CYP81Q2 ،CYP81Q3 و C3H دخیل در بیوسنتز سزامین در دانه 10 رقم کنجد شامل رقم یکتا، زودرس فلسطینی، ناز تک شاخه، ناز چند شاخه، اولتان، جیرفت، دشتستان 5، دشتستان 2، ورامین و کرج 1 با روش QRT-PCR و ژن خانه‌دار 18S rRNA بررسی شد. براساس نتایج حاصله سطح بیان ژن CYP81Q1 در رقم زودرس فلسطینی پایین بوده و بعلت پایین بودن مقدار سزامین آن، این رقم را نمی‌توان در مقایسه با سایر ارقام به‎عنوان یک رقم روغنی مطلوب از نظر کیفییت معرفی کرد. رقم یکتا در بین ارقام بیشترین سطح بیان ژن CYP81Q1 را داشت و یکی از بهترین ارقام در تولید روغن از نظر کیفی و کمی است. ژن CYP81Q2 در رقم ناز چند شاخه بیشترین و ژن CYP81Q3 در رقم زودرس فلسطینی کمترین سطح بیان را داشتند. همچنین ارقام کرج 1، یکتا و دشتستان 5 بیشترین سطح بیان ژن C3H و اولتان کمترین سطح بیان را داشتند. ارقام کرج 1، یکتا و دشتستان 5 جزء ارقام تقریباً دیررس هستند. ارقام دیررس دارای روغن بیشتر و محتوای سزامین بالاتری در مقایسه با ارقام زودرس هستند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Expression of CYP genes involved in sesamin biosynthesis pathway in different varieties of sesame seeds (Sesamum indicum L.)

نویسندگان [English]

  • Azedeh Rayani 1
  • Fatemeh Dehghan Nayeri 2
1 M.Sc. in Agricultural Biotechnology, Faculty of Agriculture and Natural Resources, Imam Khomeini International University, Qazvin, Iran.
2 Assistance Professor of Agricultural Biotechnology, Faculty of Agriculture and Natural Resources, Imam Khomeini International University, Qazvin, Iran.
چکیده [English]

Sesame (Sesamum indicum L.) is one of the oldest oilseed crops that has been a main food source providing beneficial nutritional outcomes to human health due to its high contents of antioxidants and secondary metabolites. The importance of sesame arises from presence of antioxidant sesamin. Over recent decades, due to being used in cancer cases, there have been numerous efforts aimed at better understanding of the genes underlying sesamin biosynthesis and increasing their expression. In this research, expression levels of the key genes in sesamin biosynthesis pathway including CYP81Q1, CYP81Q2, CYP81Q3 and C3H genes were measured in 10 sesame cultivars seeds (Yekta, early Palestinian, Naz tak shakheh, Naz chand shakheh, Oltan, Jiroft, Dashtestan 5, Dashtestan 2, Varamin and Karaj 1) by QRT-PCR technique and 18S rRNA gene as reference gene. Our findings showed that the level of CYP81Q1 gene expression was low in Early Palestinian that has low sesamin content. Therefore, this might not be considered as a qualitatively desired oil cultivar compared to others, whereas Yekta had the highest level of CYP81Q1 expression the best varieties for oil production both qualitatively and quantitatively. The highest expression level of CYP81Q2 was observed in Naz chand shakheh, while the lowest CYP81Q2 expression was found in Early Palestinian. Karaj1, Yekta and Dashtestan 5 showed the highest whereas Oltan had the lowest expression level of C3H. Karaj 1, Yekta and Dashtestan 5 were relatively from the late mature group that was reported to have higher contents of oil and sesamin than early ones.

کلیدواژه‌ها [English]

  • "Sesame"
  • "Sesamin"
  • "QRT-PCR"
  • "Gene expression"

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