Pseudomonas marginalis: یک بیمارگر بالقوه برای گیاهان گلخانه‌ای و گیاهان زراعی با سیستم آبیاری بارانی

نوع مقاله : مقاله کامل پژوهشی

نویسنده

عضو هیات عملی

چکیده

طی سال‌های 96-1389، از مناطق مختلف استان چهارمحال و بختیاری، تعداد 243 نمونه از گیاهان زراعی (با سیستم آبیاری بارانی) و گلخانه‌ای با علائم لکه‌های نکروتیک، سوختگی حاشیه برگ، پوسیدگی میوه و پژمردگی جمع‌آوری شد. نمونه‌ها موردبررسی آزمایشگاهی برای جداسازی و شناسایی باکتری‌های همراه با علائم فوق بر اساس روش‌های استاندارد باکتری‌شناسی گیاهی قرار گرفتند و جنس‌های مختلفی از باکتری‌ها جداسازی شد، اما فراوانی جداسازی باکتری‌های فلورسنت بیشتر از سایر جنس‌های باکتری‌ها بود. 5/53 درصد جدایه‌ها  به Pseudomonas marginalisو 2/18 درصد به P. syringae pv syringaeتعلق داشتند. جدایه‌های P. marginalis از خیار، سیب‌زمینی، گوجه‌فرنگی، فلفل، گندم، چغندرقند و دیفن باخیا و جدایه‌های P. syringae pv syringae  از خیار، چغندرقند، گندم و گوجه‌فرنگی در میزبان خود بیماری‌زا بودند. واکنش زنجیره‌ای پلیمراز با آغازگرهای عمومی 16Sf/16Sr و R1378/PO27F، طراحی‌شده برای γ-Proteobacteria انجام شد و هم‌ردیف سازی ترادف نوکلئوتید‌ها در بانک جهانی ژن تشخیص باکتری‌های جداشده را بر اساس ویژگی‌های بیوشیمیایی و فیزیولوژیکی تأیید کرد. ارزیابی فایلوژنتیکی بر اساس ترادف نوکلئوتید ژن 16SrDNA برای 10 جدایه ایرانی P. marginalisنشان داد که از نظر مولکولی از هم متمایز هستند. این پژوهش نشان داد که جدایه‌های P. marginalis می‌توانند به‌عنوان بیمارگر بالقوه برای گیاهان زراعی، با سیستم آبیاری بارانی و گیاهان گلخانه‌ای در شرایط مساعد باشند.

کلیدواژه‌ها


عنوان مقاله [English]

Pseudomonas marginalis as a potential pathogen of greenhouse grown plants and crops with sprinkler irrigation

نویسنده [English]

  • N. AMANIFAR
Faculty member
چکیده [English]

During 2010-2017, samples of different plants grown in greenhouses and crops with sprinkler irrigation systems, in Chaharmahal va Bakhtiary province, showing symptoms of necrotic spots, marginal leaf blight, fruit rot, and wilting were collected and tested for the presence of bacteria associated with those symptoms. The isolated bacteria were identified based on standard methods for the identification of plant pathogenic bacteria. Pathogenicity of strains was tested on appropriate hosts under greenhouse conditions. Although various genera of bacteria were isolated, isolation frequency of fluorescent pseudomonads was more than other genera of bacteria. Fifty-three and a half percent of pseudomonads was identified as Pseudomonas marginalis and 18.2% as P. syringae pv syringae. The isolates of P. marginalis from cucumber, potato, tomato, pepper, wheat, beet, and dieffenbachia and strains of P. syringae pv syringae from cucumber, sugar beet, wheat, and tomato were pathogenic on their respective hosts. Polymerase chain reaction with universal primers 16Sf / 16Sr and R1378 / PO27F, designed for detection of γ-Proteobacteria, confirmed the identity of the isolated bacteria based on biochemical and physiological tests by the alignment of nucleotide sequences in the GeneBank. Phylogenetic analysis based on 16SrDNA gene sequences of 10 isolates of  P. marginalis were differentiated from each other. This investigation showed that strains of P. marginalis can  bepotential pathogens for greenhouse plants and field crops  with sprinkler irrigation.

کلیدواژه‌ها [English]

  • Fluorescent bacteria
  • marginal leaf blight
  • sprinkler irrigation
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