نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زیست شناسی، واحد علوم و تحقیقات تهران، دانشگاه آزاد اسلامی، صندوق پستی: 775-14515، تهران ـ ایران

2 پژوهشکده ی کاربرد پرتوها، پژوهشگاه علوم و فنون هسته ای، سازمان انرژی اتمی، صندوق پستی: 3486-11365، تهران ـ ایران

چکیده

 تنوع ژنتیکی حاصل از دو جهش‌زای فیزیکی متفاوت (پرتو گاما، باریکه‌ی الکترونی) در دزهای مختلف (50 تا Gy 400) و دو رطوبت متفاوت (5/6 و %5/12) در دانه‌های گندم نان رقم طبسی با استفاده از نشان‌گرهای دی ان ا چندریختی تصادفی تقویت شده مورد بررسی قرار گرفت. بیش‌ترین میانگین ناجور تخم‌زایی در جمعیت 2 (با مقدار 155/0) و کم‌ترین مقدار آن در جمعیت 5 (با مقدار 042/0) مشاهده شد. براساس نتیجه‌های به دست آمده، بیش‌ترین فاصله‌ی ژنتیکی یا کم‌ترین تشابه ژنتیکی، بین جمعیت TE1M (ردیف‌های جهش یابنده‌ی نسل 1 رقم طبسی که با الکترون جهش یافته بودند) و جمعیت TE2M (ردیف‌های جهش یابنده‌ی نسل 2 رقم طبسی که با الکترون جهش یافته بودند) مشاهده شد. کم‌ترین فاصله‌ی ژنتیکی یا بیش‌ترین تشابه ژنتیکی بین جمعیت TG2M (جمعیت ردیف‌های جهش یابنده‌ی نسل 2 رقم طبسی که با پرتو گاما جهش یافته بودند) و جمعیت TE2M (جمعیت ردیف‌های جهش یابنده‌ی نسل 2 رقم طبسی که با الکترون جهش ‌یافته بودند) مشاهده شد. تجزیه‌ی خوشه‌ای پنج جمعیت ردیف‌های جهش یافته و شاهدهای رقم طبسی براساس مقدار تشابه ژنتیکی و با استفاده از روش جفت گروه بدون وزن با میانگین حسابی انجام و نمودار درختی با برش نمودار از نقطه تشابه 89/0 دو گروه حاصل شد. براساس نتایج به دست آمده، تنوع بین جمعیت‌ها معنی‌دار و بیش‌تر از تنوع درون جمعیت‌ها بود.
 

کلیدواژه‌ها

عنوان مقاله [English]

Investigating the genetic diversity arising from two physical mutagens (gama ray, electron beam) using random amplified polymorphic DNA markers in the (Triticum aestivum L.) plant, Tabasi cultivar

نویسندگان [English]

  • Fariba Zarrabi ahrabi 1
  • Ahmad Majd 1
  • Abbas Majdabadi 2
  • Taher Nejad Sattari 1

چکیده [English]

 This article aims at investigating the genetic diversity arising from two physical mutagens (gamma ray, electron beam) with different doses (50-400 Gy) and two different levels of humidity (6.5% and 12.5%) in the (Triticum aestivum L.) plant in Tabasi cultivar, using RAPD markers. The maximum and minimum average rates of heterozygosity were obtained in the second and the fifth populations (0.155 and 0.042), respectively. Based on the obtained results, the highest genetic distance or the lowest genetic similarity was observed between M1TE population (the first generation mutant lines mutated by electron) and M2TE population (the second generation mutant lines mutated by electron). The lowest genetic distance or the highest genetic similarity was found between M2TG (the second generation mutant lines of mutated by gamma ray) and M2TE (the second generation mutant lines mutated by electron) populations. Five mutant lines and Tabasi species witnesses were investigated based on common genetic values using UPGMA cluster analysis. Cutting the obtained dendrogram from the similar point (0.89), two groups were achieved. Based on the obtained results the inter-population diversity was more significant than the intra-population diversity.
 

کلیدواژه‌ها [English]

  • RAPD
  • Gamma Ray
  • Electron Beam
  • Triticum aestivum
  • Tabasi cultivor
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