اثر ژنوتیپ گیاه و مکان جغرافیایی بر روی فراوانی باکتری اندوفیت متیلوباکتریوم در میوه دو رقم توت‌فرنگی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار بیوتکنولوژی گیاهی، گروه زراعت و اصلاح نباتات، دانشکده کشاورزی، دانشگاه کردستان، سنندج

2 دانش‌آموخته ارشد بیوتکنولوژی کشاورزی، دانشگاه کردستان، سنندج

3 دانشیار بیماری‌شناسی گیاهی، گروه گیاهپزشکی، دانشکده کشاورزی، دانشگاه کردستان، سنندج

چکیده

اندوفیت به گروهی از میکروارگانیسم ها اطلاق می­گردد که در قسمتهای داخلی بافت­های گیاهان زندگی نموده و بر بسیاری از خصوصیات گیاه میزبان تأثیر می­گذارند. گونه‌های مختلف باکتری اندوفیت متیلوباکتریوم در سنتز کاراتنوئیدها، تولید ترکیبات فنولی و فرار، همچنین در افزایش سطح تولید اجزای سازنده عطر و طعم در میوه مؤثر
می­باشند. تنوع و فراوانی این باکتری‌ها تحت تأثیر ژنوتیپ گیاه میزبان، شرایط اقلیمی و خاک می‌باشد. این مطالعه به منظور جداسازی باکتری‌های جنس متیلوباکتریوم از دو رقم توت‌فرنگی در مناطق مختلف استان کردستان انجام شد. در این پژوهش باکتری‌های اندوفیت از میوه دو رقم توت‌فرنگی کردستان و پاروس جمع­آوری شده از سه منطقه انگوژان، گاورود و نشور در استان کردستان جداسازی شدند. شناسایی جدایه های باکتری براساس تعیین توالی ژن  16S rDNA انجام گردید. بدین منظور پس از استخراج DNA ژنومی جدایه­ها، ژن 16S rDNA به روش PCR تکثیر و پس از تعیین توالی میزان شباهت توالی­های به دست آمده با توالی نوکلئوتیدی ژن 16S rDNA سایر باکتری‌های مرجع با استفاده از نرم افزار Blastn محاسبه گردید. سپس جمعیت جدایه­های باکتری‌ در زمان‌های (مراحل) مختلف رسیدگی میوه تعیین گردید. نتایج به دست آمده نشان داد که باکتری جدا شده در هر دو رقم کردستان و پاروس متعلق به جنس متیلوباکتریوم (Methylobacterium) می باشد. جمعیت باکتری‌های متیلوباکتریوم در ارقام مورد مطالعه در مناطق مشابه از لحاظ آماری متفاوت بود. رقم کردستان در مقایسه با رقم پاروس، در هر سه منطقه برتری معنی‌داری از لحاظ جمعیت باکتری نشان داد (p< 0.05). بیشترین جمعیت باکتری در هر دو رقم و در مناطق جغرافیایی مورد مطالعه در مرحله رسیدگی میوه محاسبه گردید. با توجه به تفاوت دو رقم گیاه از لحاظ عطر و طعم و همچنین تفاوت معنی‌دار جمعیت باکتری احتمال تأثیر این باکتری‌ها در عطر و طعم این دو رقم وجود دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of plant genotype and geographical location on the frequency of endophytic Methylobacterium in two strawberry cultivars fruit

نویسندگان [English]

  • Bahman Bahramnejad 1
  • mohammad Akhtari 2
  • Behrouz Harighi 3
  • mohammad Naji 2
1 Associated professor in Plant Biotechnology, Department of Agronomy and Plant Breeding, Faculty of Agriculture, University of Kurdistan
2 Former Master of Science student of University of Kurdistan
3 Associated professor in Plant Pathology, Department of Plant Protection, Faculty of Agriculture, University of Kurdistan
چکیده [English]

Endophytes are microorganisms (bacteria or fungi or actinomycetes) that reside inside the internal tissues of plant with no negative effect on host plants. Endophytic bacteria trigger many positive effects on host plants. The aroma and flavor of strawberry fruit are important characteristics that is affected by endophytic bacteria such as Methylobacterium. Endophytic bacteria, are effective in the synthesis of carotenoids and the production of volatile and phenolic compounds. In addition, they are effective in producing the aromatic components in fruit. Endophytic bacterial frequency and genotype can be affected by host plant genotype, climatic and soil conditions. This study was carried out to isolate endophytic bacteria from two strawberry cultivars (Kurdistan and Parous) in three regions (Angouzan, Gavrood and Noshur) in Kurdistan province. For accurate identification of bacterial isolates, 16S-rRNA gene sequencing was used for identification of purified endophytic isolates and their frequency determined at different times of fruit ripening. The results revealed that the all endophytic bacterial isolates from both cultivars were belong to the genus Methylobacterium. The frequency of these bacteria was statistically different in two cultivars and in different sampling time. The frequency of Methylobacterium significantly was higher in Kurdistan cultivar compared to Parous cultivar in all three regions (p <0.05). The highest frequency of Methylobacterium was observed in the fruit ripening time. It seems that Methylobacterium and its frequency probably have an effect on the aroma and delicacy of these two varieties.

کلیدواژه‌ها [English]

  • Kurdistan
  • Parous
  • Endophytic Bacteria
  • 16SrRNA
  • Strawberry
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