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نوع مقاله : مقالات پژوهشی

نویسندگان

1 دانشجوی دکتری آلودگی محیطزیست، واحد تنکابن، دانشگاه آزاد اسلامی، تنکابن، ایران.

2 استادیارگروه محیط زیست/ دانشگاه آزاد واحد تنکابن

3 دانشیار،گروه میکروبیولوژی، واحد تنکابن، دانشگاه آزاد اسلامی، تنکابن، ایران.

چکیده

زمینه و هدف: دیازینون، یک حشره­کش ارگانوفسفره است که به‌طور گسترده در شالیزار­ها و باغات استفاده می­شود. ورود آلاینده مقاوم به منابع تأمین آب شرب، خاک و محصولات کشاورزی، می­تواند اثرات مخربی بر سلامت انسان و محیط زیست داشته باشد. مطالعه حاضر با هدف شناسایی و جداسازی باکتری­های تجزیه­ کننده سم دیازینون و سنجش مقدار سمی که باکتری­های برتر در محیط مایع و خاک تجزیه می­کنند، انجام گرفت.
مواد و روش­ها: در این پژوهش نمونه­برداری از باغات تنکابن انجام شد. شناسایی و تعیین توالی سویه­ها با استفاده از واکنش زنجیره ای پلیمراز بر اساس S rRNA16 صورت گرفت. میزان تجزیه دیازینون توسط باکتری‌های جدا شده با دستگاه کروماتوگرافی گازی سنجش شد.
یافته­ ها: دو سویه باکتری تجزیه­ کننده دیازینون از جنس سراشیا و انتروباکترکلوآکا شناسایی شدند. باکتری­ها با غلظت 10 و 20 پی­پی­ام دیازینون در محیط براث و خاک به‌مدت 10 روز کشت داده شدند و مقدار تجزیه سم مورد اندازه­گیری قرار گرفت. بر اساس نتایج، باکتری سراشیا در محیط براث با غلظت اولیه 10 و 20 پی­پی­ام، 3/64% و 4/78% مصرف دیازینون داشت و در محیط خاک با همین غلظت 2/90% و 25/98% سم دیازینون را تجزیه کرد. باکتری انتروباکترکلوآکا در محیط براث و خاک به‌ترتیب 1/23%، 95/17% و 19/31%، 05/88% دیازینون را مصرف و تجزیه کرد. با توجه به نتایج حاصل، باکتری سراشیا بیشترین قابلیت تجزیه را نسبت به انتروباکتر دارد.
نتیجه­­ گیری: نتایج این تحقیق نشان داد برخی میکروارگانیسم­های موجود در خاک، توانایی تجزیه دیازینون را دارند. استفاده از این میکروارگانیسم­ها و دیگر روش­های زیستی جهت پاک­سازی خاک­های آلوده می­تواند روش مناسبی باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Biodegradability of Diazinon Poison in Grand Soils by Bacterias Isolated from them

نویسندگان [English]

  • Mona Mansouri 1
  • Aptin Rahnavard 2
  • Masood Ghane 3

1 Phd student of Environmental Pollution, TonekabonBranch , Islamic Azad University, Tonekabon, Iran.

2 Assistant Professor the Department of Environment / Azad University of Tonkabon Branch

3 Associate Professor,Department of Microbiology,Tonekabon Branch, Islamic Azad University, Tonekabon, Iran.

چکیده [English]

Background and purpose: Diazinon is an organophosphorus insecticide that is widely used in paddy fields and gardens. The entry of resistant pollutants into drinking water sources, soil, and agricultural products can be harmful to human health and the environment. This study aimed to identify and isolate diazinon-degrading bacteria and measure the amount of poison decomposed by superior bacteria in liquid and soil environments.
Materials and methods: Sampling was conducted from Tonekabon gardens. The strains were identified and sequenced using polymerase chain reaction based on 16S rRNA. The rate of diazinon degradation by the isolated bacteria was measured by gas chromatography
Results: Two strains of diazinon-degrading bacteria, Serratia and Enterobacter cloacae, were identified. Bacteria with diazinon concentrations of 10 and 20 ppm were cultured in broth and soil for 10 days, and the amount of poison decomposition was measured. The results indicated that Serratia bacteria in the broth medium, with initial concentrations of 10 and 20 ppm, consumed 64.3% and 78.4% of diazinon, respectively, while in the soil with the same concentration, it decomposed 90.2% and 98.25% of diazinon. Enterobacter cloacae bacteria consumed and decomposed diazinon in the broth and soil environments, with percentages of 23.1, 17.95, 31.19, and 88.05%, respectively. According to the results, Serratia has a higher decomposition ability compared to Enterobacter.
Conclusion: The results of this research showed that some microorganisms in the soil have the ability to decompose diazinon. Utilizing these microorganisms and other biological methods to clean contaminated soils can be a suitable approach.

کلیدواژه‌ها [English]

  • Keywords:Bacteria
  • Soil
  • Diazinon
  • Biodegradability
  • Serratia
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