شناسایی ویروس های آران ای دار همراه با زردی کدوئیان در جنوب شرق ایران و تنوع ژنتیکی ویروس شایع آن

نویسندگان

1 دانشجوی دکتری ویروس شناسی و بیماری های ویروسی گیاهی، گروه گیاهپزشکی، دانشگاه علوم کشاورزی ومنابع طبیعی گرگان، گرگان، ایران.

2 دانشیار گروه گیاهپزشکی، دانشگاه علوم کشاورزی ومنابع طبیعی گرگان، گرگان، ایران.

3 استادیار گروه گیاهپزشکی، دانشگاه علوم کشاورزی ومنابع طبیعی گرگان، گرگان، ایران.

4 استادیار گروه زیست شناسی، دانشگاه سیستان و بلوچستان، زاهدان، ایران.

5 استادیار گروه گیاهپزشکی، مجتمع آموزش عالی سراوان، ایران.

چکیده

چکیده
بیماری­های زردی محصولات در گلخانه و مزارع کدوئیان که توسط ویروس­های قابل انتقال با مگس سفیدBemisia) (tabaci ایجاد می­شود به طور فزاینده­ای در جهان و ایران در حال افزایش می­باشند. به منظور بررسی آلودگی­های ویروسی در استان سیستان و بلوچستان، تعداد 195 نمونه­ی برگ دارای علایم ویروسی جمع آوری و آلودگی آن­ها به برخی از ویروس­های شایع کدوئیان از طریق RT-PCR با آغازگرهای اختصاصی مورد بررسی و برخی از آنها تعیین توالی شدند. نتایج بدست آمده نشانگر آلودگی 59 % نمونه­ها به ویروس­های غالب کدوئیان در کلیه­ی مناطق مورد بررسی بود. برخی از نمونه­ها به ویروس اختلال کوتولگی زرد کدوئیان (Cucurbit yellow stunting disorder virus)، ویروس زردی شته زاد کدوئیان (Cucurbit AphidBorneYellows virus)، ویروس زردی رگبرگ خیار (Cucumber vein yellowing virus)، ویروس زردی کلروتیک کدوئیان (Cucurbit chlorotic yellows virus) و ویروس کوتولگی سبززرد هندوانه ((Watermelon chlorotic stunt virus آلوده بودند. بیشترین میزان آلودگی نمونه­های جمع آوری شده به ترتیب 43، 28 و 8 درصد مربوط به ویروس­های WCSV، CVYV و CYSDV بود. نتایج آنالیزهای تبارزایی روی جدایه­های CYSDV نشان داد که جدایه­ها در دو زیرگروه شرقی و غربی و دو جدایه SB و SB2 همراه با 12 جدایه­ی ایرانی و چهار جدایه­ی عربستان در زیرگروه شرقی قرار گرفتند. همچنین مطالعات ژنتیکی روی بخشی از ژن پروتئین پوششی نشان داد که در جدایه­های ایرانی و زیرگروه شرقی، جهش CGA به CCA اتفاق افتاده که منجر به جایگزینی آرژنین به جای گلوتامین در کدون 73 پروتئین پوششی شده است. بنابراین اختلاف نوکلئوتیدی جدایه­های ایرانی در مقایسه با جدایه­های مناطق مختلف نشان­دهنده­ی تنوع ژنتیکی بالا و قدمت طولانی این ویروس بومی در ایران است
 

 

کلیدواژه‌ها


عنوان مقاله [English]

Identification of RNA-Associating Viruses with Yellow Cucurbits in South Eastern Iran and Genetic Diversity of the Prevalent Virus

نویسندگان [English]

  • zahra Sadeghi 1
  • Saeid Nasrolahnejad 2
  • Milad Legzian 3
  • Seyed Emaeil Razavi 4
  • Majid Jafari 5
1 Ph. D. Student of Virology and Plant Viral Diseases, Department of Plant Protection, Gorgon University of Agricultural Sciences & Natural Resources,Gorgan, Iran.
2 Associate Professor Respectively, Department of Plant Protection, Gorgon University of Agricultural Sciences & Natural Resources,Gorgan, Iran.
3 Assistant Professor Respectively, Department of Plant Protection, Gorgon University of Agricultural Sciences & Natural Resources,Gorgan, Iran.
4 Assistant Professor, Department of Biology, University of Sistan and Baluchestan, Zahedan. Iran.
5 Assistant Professor, Department of Plant Protection, Higher Educational Complex of Saravan, Iran
چکیده [English]

Abstract
Yellowing disease of greenhouse and open-grown cucurbits by whitefly-transmitted viruses is dramatically rising in the world and Iran. To study the viral infection of cucurbits in Sistan-Baluchistan Province, 195 leaf samples with viral symptoms were collected and tested for infection of some prevalent cucurbit viruses by RT-PCR using specific primers and some expected amplified DNA fragments were sequenced. Results confirmed the presence of viral infection (%59) in all surveyed areas. Including CABYV, CYSDV, CCYV, CVYV and WmCSV. The most infection of collected samples were %43, % 28 and % 8 of WmCSV, CVYV and CYSDV respectively. Phylogenetic analysis showed that the CYSDV isolates were divided into two sub-groups of East and West and two SB and SB2 isolates with 12 Iranian isolates and 4 Saudi Arabia isolates were clustered in eastern subgroup. Also genetic studies on the part of the coat protein gene showed that in Iranian isolates and Eastern subgroup the CGA had changed to CCA which led to the substitution of Glutamine by arginine at the codon position 73 of coat protein. Therefore, the nucleotide differences of Iranian isolates than the isolates from different regions indicate high genetic diversity and long dating of this native virus in Iran                                                         .                              
 

کلیدواژه‌ها [English]

  • Keywords: Cucurbit yellow stunting disorder virus (CYSDV)
  • Genetic diversity
  • Sistan and Baluchestan Province
  • viral infection
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