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بررسی ساختار ژنتیکی جمعیت‌های قارچ Pyrenophora gramineaعامل بیماری لکه نواری جو با استفاده از نشانگر ISSR

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه گیاه‌پزشکی، دانشکدۀ کشاورزی، دانشگاه ایلام

2 کارشناس ارشد بیماری‌شناسی گیاهی، دانشکدۀ کشاورزی، دانشگاه ایلام

چکیده

لکه ‌نواری یکی از مهم‌ترین بیماری‌های جو در استان ایلام است که قارچ Pyrenophora graminea آن را ایجاد می‌کند. برای تعیین ساختار ژنتیکی جمعیت‌های قارچ P. graminea از گیاهان آلودۀ جو در مزارع مناطق مختلف استان ایلام که زخم‌های قهوه‌ای‌رنگ نواری در اندام‌های هوایی داشتند، به‌طور تصادفی نمونه‌برداری صورت گرفت. در نهایت 69 جدایه از نمونه‌های آلوده با استفاده از محیط کشت سیب‌زمینی ـ دکستروز ـ آگار به‌دست آمد. برای آزمون بیماری‌زایی عامل بیماری به دلیل تولید نشدن اسپور کافی در محیط کشت مصنوعی از روش ساندویچی برای آلوده‌سازی بذرها استفاده شد. برای مطالعۀ تنوع ژنتیکی در جدایه‌ها از هشت نشانگر ISSR مخصوص قارچP. gramineaاستفاده گردید. تعداد کل 171 آلل در بین همۀ جمعیت‌ها در اثر آغازگر بین ریزماهواره مشخص شدند. تعداد آلل‌ها برای هر نشانگر از 16 تا 30 عدد متغیر بودند.گروه‌بندی جدایه‌ها بر اساس ضریب تشابه دایس و روش UPGMA انجام گرفت و بر این اساس سیزده گروه مشخص شد. مقایسۀ پارامترهای مربوط به تنوع ژنتیکی در جمعیت‌ها نشان داد که جمعیت دره‌شهر )32/0 (h= دارای بالاترین تنوع ژنتیکی است. کوچک‌ترین فاصلۀ ژنتیکی به مقدار 019/0 بین جمعیت‌های آسمان‌آباد و سیروان مشاهده گردید. بر اساس فنوگرام به‌دست‌آمده برای جمعیت‌ها، دو گروه جمعیت نشان داده شد. یک گروه شامل جمعیت دره‌شهر و گروه بعدی شامل جمعیت‌های ایوان، آسمان‌آباد، سیروان و چرداول بود. تجزیۀ واریانس مولکولی برای مقایسۀ تنوع ژنتیکی داخل و بین جمعیت‌ها نشان داد که بیشترین تنوع مربوط به داخل جمعیت‌ها به مقدار 94 درصد است و میزان تنوع ژنتیکی در بین جمعیت‌ها بسیار کم است و این میزان تنوع ژنتیکی بین جمعیت‌ها را می‌توان با مقدار بالای جریان ژنی به مقدار 576/4 بین جمعیت‌ها توجیه کرد.

کلیدواژه‌ها


عنوان مقاله [English]

Study on genetic structure of Pyrenophora graminea populations the causal agent of barley leaf stripe disease using ISSR marker

نویسندگان [English]

  • Khoshnood Nooralahi 1
  • Masoumeh Shahbazi 2
1 Assistant Professor, Department of Plant Protection, Plant Pathology, Faculty of Agriculture, University of Ilam
2 Former Graduate Student, Plant Pathology, Faculty of Agriculture, University of Ilam
چکیده [English]

Barley leaf stripe caused by Pyrenophora graminea is one of the most important diseases of barley in Ilam province. In order to determine the genetic structure of P. graminea populations, sampling was randomly carried out on aerial parts of barley plants with leaf brown lesions, from different regions in Ilam province. A total of 69 P. graminea isolates were obtained from infected samples using potato dextrose agar media. Pathogenicity test and inoculation of seeds were done with Sandwich method, because causal agent cannot produce enough spores on artificial media. A set of eight Inter simple sequence repeat primers (ISSR) were used to determine genetic diversity of P. graminea isolates. This set ISSR primers revealed a total of 171 alleles for P. graminea isolates in all populations. The number of alleles varied from 16 to 30 for each marker. Cluster analysis were carried out with according Dice similarity coefficient and UPGMA method. Based on dendrogram thirteen groups were revealed. A Comparison of the parameters of genetic diversity in seven population showed that Darehshahr population has the highest genetic diversity (h= 0.32) and the smallest genetic distance was observed between population Asemanabad and Sirvan (0.019). The phonogram revealed two distinct groups, one group contained Darehshahr and the other Ivan, Asemanabad, Sirvan and Chardavol populations. Molecular analysis of variance to compare the genetic diversity within and between populations showed the greatest diversity related within populations (94%) and the level of genetic variation among populations was very low (6%). High level of genetic variation within populations can be justified by highest amount of gen flow (Nm= 4.576).

کلیدواژه‌ها [English]

  • genetic structure
  • Pyrenophora graminea
  • ISSR
  • Barley
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