با همکاری مشترک دانشگاه پیام نور و انجمن بیوتکنولوژی جمهوری اسلامی ایران

نوع مقاله : علمی پژوهشی

نویسندگان

1 گروه به نژادی گیاهی، دانشکده علوم زراعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری

2 هیئت علمی دانشگاه علوم کشاورزی و منابع طبیعی ساری و رئیس پژوهشکده ژنتیک و زیست فناوری طبرستان

3 دانشیار گروه بیوتکنولوژی و به‎نژادی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران

4 گروه مهندسی ژنتیک و بیولوژی، پژوهشکده ژنتیک و زیست فناوری کشاورزی طبرستان، دانشگاه علوم کشاورزی و منابع طبیعی ساری

چکیده

MicroRNAها گروه بزرگی از RNAهای کوچک و غیرکدکننده هستند که با برش mRNA مورد هدف و یا مهار ترجمه، بیان این ژن‌ها را تنظیم می‌کنند. خانواده miR164 گیاهی بسیار حفاظت‌شده بوده و از طریق تنظیم ژن‌های NAC مورد هدف خود، در پاسخ گیاهان به تنش‌های غیرزیستی نقش دارند. در مطالعه حاضر، 68 ژن بالقوه کدکننده دمین NAC در Aeluropus littoralis به‌عنوان یک گیاه هالوفیت از خانواده Poaceae شناسایی شد. در میان ژن‌های AlNAC شناسایی شده، 4 ژن به‌عنوان هدف miR164 پیش‌بینی شدند. حفظ‌شدگی بالای جایگاه‌های تششخیص miR164 در ژن‌های AlNAC حاکی از نقش ضروری جایگاه‌های هدف در کارکرد طبیعی این ژن‌ها به‌عنوان عوامل رونویسی می‌باشد. الگوی بیان ژن انتخابی AlNAC1L.1 در پاسخ به تنش‌های شوری و خشکی و فیتوهورمون ABA در بافت‌های برگ، ساقه و ریشه با استفاده از RT-qPCR مورد بررسی قرار گرفت. نتایج نشان داد که ژن AlNAC1L.1 در زمان 6 ساعت بعد از اعمال تنش در تمامی بافت‌ها کاهش بیان نشان می‌دهد. در بین تیمارها، تیمار سدیم‌کلرید 600 میلی‌مولار بیان AlNAC1L.1 را در بافت‌های برگ، ساقه و ریشه به ترتیب حدود 217- ، 26- و 9- برابر کاهش داد. بنابراین، AlNAC1L.1 به‌عنوان ارتولوگ ژن OMTN6 (ژن NAC هدف miR164 در برنج) می‌تواند نقش تنظیم‌کننده منفی در پاسخ به تیمار‌های شوری، خشکی و ABA ایفا نماید. این نتایج نشان داد که کارکرد برخی از پروتئین‌های NAC می‌تواند در بین گونه‌ها حفاظت‌شده باشد. در مجموع، این یافته‌ها منبع مفیدی برای تجزیه و تحلیل بیشتر میان‌کنش‌های بین ژن‌های NAC و خانواده miR164 در پاسخ به تنش‌های غیرزیستی فراهم آورده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Identification and evaluation of conserved miR164-targeted Aeluropus littoralis NAC genes in response to abiotic stress

نویسندگان [English]

  • Samira Mohammadi 1
  • Ghorbanali Nematzadeh 2
  • Hamid Najafi Zarini 3
  • Seyyed Hamidreza Hashemi-petroudi 4

1 Department of Plant Biotechnology and breeding, Sari Agricultural Sciences and Natural Resources University

2 . Department of Biotechnology and breeding. Sari Agricultural Sciences and Natural Resources University (SANRU). Sari. Iran

3 Associate professor. Department of Biotechnology and breeding. Sari Agricultural Sciences and Natural Resources University (SANRU). Sari. Iran

4 Department of Genetic Engineering and Biology, Genetics and Agricultural Biotechnology Institute of Tabarestan (GABIT), Sari Agricultural Sciences and Natural Resources University (SANRU)

چکیده [English]

MicroRNAs are a large class of small and non-coding RNAs that regulate gene expression by binding target mRNA, which leads to cleavage or translational inhibition. Plant miR164 family is highly conserved and is involved in the responses of plants to biotic stresses through the regulation of their target NAC genes. In the present study, 68 putative NAC domain-encoding genes (NACs) were identified in Aeluropus littoralis, a halophyte plant of family Poaceae. Among the AlNAC genes identified, 4 were predicted putative targets for regulation by miR164. The high conservation of miR164 recognition sites in AlNAC genes indicates the essential role of target sites in the normal function of these genes as transcription factors. Expression profile of AlNAC1L.1 candidate gene in response to salt and drought stresses and ABA phytohormone in leaf, stem and root tissues was analyzed by RT-qPCR. The results showed that AlNAC1L.1 gene down-regulated in all tissues at 6 hours after applying stresses. Among the treatments, 600 mM NaCl treatment reduced AlNAC1L.1 expression in leaf, stem and root tissues to about -217, -26 and -9 folds, respectively. Therefore, the AlNAC1L.1 which is ortholog of known Oryza miR164-targeted NAC gene OMTN6, may play negative regulatory role in response to salt, drought and ABA treatments. These results indicated that function of some NAC proteins might be conserved among species. Collectively, these findings provided a useful resource for further analysis of the interactions between NAC genes and their intricate regulation by miR164 in response to abiotic stresses.

کلیدواژه‌ها [English]

  • Abiotic stress
  • miR164
  • NAC Transcription Factors
  • post-transcriptional regulation
  • stress-responses
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