Population genetic structure and diversity of Teucrium polium in Iran using ISSR markers

Document Type : Systematics and Biodiversity of Plants

Authors

1 PhD Student, Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Research Associate Prof., Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran

3 Associate Prof., Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran

Abstract

Teucrium polium is a Mediterranean native subshrub with large distribution range and high medicinal values which overexploitation of its population has become a serious danger and conservation attempts is needed. Having the genetic information of its population can help to clarify the complicated phylogenetic relationships of species within the sections, genetic conservation and establishing breeding programs to develop cultivars and ultimately preventing declining the populations of T. polium. The genetic diversity parameters and populations structures of 16 populations of T. polium at the local scale in the Alborz mountain range of Iran were assessed using inter-simple sequence repeats (ISSR) primers. The averages of polymorphism (P%), Nei’s genetic diversity (H), and Shannon’s Information Index (I) were 33.24%, 0.118 and 0.179, respectively. The population of Asara to Gach-Sar presented the highest P%; 43.28%, H; 0.163 and I; 0.243. AMOVA analysis indicated that, a large portion of genetic variation as within population (77%), and a relatively high genetic differentiation (Gst: 0.311) and gene flow (Nm: 1.107) among populations were observed. UPGMA tree and PCoA plot of ISSR data divided the populations into three genetic groups to a significant extent based on the geographical origins. Similarly, the results showed that, STRUCTURE analysis grouped the populations into three clusters with significant geographical affinity. Teucrium polium exhibited a strong structure and genetic differentiation with low to moderate genetic diversity.
 
 
 
 

Keywords


Article Title [Persian]

ساختار ژنتیکی جمعیتی و تنوع Teucrium polium در ایران با استفاده از نشانگرهای ISSR

Authors [Persian]

  • فاطمه مهاجر تبریزی 1
  • یونس عصری 2
  • ایرج مهرگان 3
1 دانشجوی دکتری، گروه زیست‏شناسی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران
2 دانشیار پژوهش، مؤسسه تحقیقات جنگل‌ها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران
3 دانشیار گروه زیست‌شناسی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران
Abstract [Persian]

Teucrium polium L. متعلق به تیره نعناییان (Lamiaceae)، درختچه‏ای کوچک، بومی مدیترانه، با دامنه گسترش وسیع و ارزش دارویی بالاست که برداشت بی‌رویه آن از جمعیت‌های طبیعی تبدیل به تهدید جدی گردیده و نیازمند اقدامات محافظتی می‌باشد. داشتن اطلاعات ژنتیکی جمعیت‌های آن می‌تواند برای روشن شدن روابط پیچیده فیلوژنتیک گونه‏ها درون بخش‏ها، حفاظت از منابع ژنتیکی و ایجاد برنامه اصلاحی جهت توسعه ارقام و نهایتا جلوگیری از کاهش جمعیت‌های T. polium استفاده گردد. پارامترهای تنوع ژنتیکی و ساختار جمعیتی 16 جمعیت T. polium در سطح محلی در رشته کوه‏ البرز ایران با استفاده از نشانگر مولکولی ISSR مورد بررسی قرار گرفت. میانگین‏های درصد چندریختی (P%)، ضریب تنوع نی (H) و ضریب شاخص شانون (I) به ترتیب 24/33، 118/0 و 179/0 بود. جمعیت آسارا به گچسر بالاترین مقادیر درصد چندریختی، ضریب تنوع نی و ضریب شاخص شانون به ترتیب 28/43، 163/0 و 243/0 را نشان داد. تجزیه و تحلیل واریانس مولکولی (AMOVA) سطح بالایی از تنوع ژنتیکی درون جمعیت‌ها (77%) را نشان داد و تمایز ژنتیکی نسبتا بالا (311/0 :Gst) و جریان ژنی (107/1 Nm:) در بین جمعیت‏ها مشاهده شد.نتایج تحقیق حاضر همچنین نشان داد که تجزیه و تحلیل درخت UPGMA و نقشه PCoA از داده‏های ISSR جمعیت‏های عمدتا مرتبط با منشا جغرافیایی را می‌توان به سه گروه ژنتیکی تقسیم کرد. ساختار جمعیتی و تمایز ژنتیکی قوی با سطح تنوع ژنتیکی متوسط به پایین در T. polium مشاهده گردید.
 
 

Keywords [Persian]

  • آنالیز ساختار
  • دگرگشنی
  • تمایز ژنتیکی
  • تنوع ژنتیکی
  • نعناییان
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