اثر پرتو گاما بر روی شاخص‌های تغذیه‌ای مراحل لاروی و حشرات کامل شپشه‌ی آرد Tribolium castaneum (Coleoptera: Tenebrionidae)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 پژوهشکده تحقیقات کشاورزی، پزشکی و صنعتی، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 498-31485، کرج ـ ایران

2 گروه حشره‌شناسی، دانشکده کشاورزی، دانشگاه تربیت مدرس، صندوق پستی: 336-14115، تهران ـ ایران

چکیده

در این پژوهش تأثیر ضدتغذیه‌ای دزهای مختلف پرتو گاما به عنوان یک عامل کنترل­کننده بر روی لاروها و حشرات کامل شپشه­ی آرد Tribolium castaneum (Herbst) بررسی شد. از دزهای 100، 400، 600، 800 و 1000 گری پرتو گاما استفاده شده و پس از گذشت 72 ساعت، شاخص‌های تغذیه‌ای مورد ارزیابی قرار گرفت. نرخ رشد نسبی (RGR)، نرخ مصرف نسبی (RCR)، کارآیی تبدیل غذای خورده شده (ECI) و شاخص بازدارندگی تغذیه (FDI) به عنوان شاخص‌های تغذیه‌ای اندازه‌گیری شدند. تیمارها به روش دیسک آردی در شرایط دمایی 1±27 درجه­ی سلسیوس، رطوبت نسبی 65 درصد و تاریکی ارزیابی شدند. نتایج نشان داد که رشد نسبی لاروها و حشرات کامل پرتو دیده کاهش معنی­داری داشت (P<0.05)  و شدت آن در لاروها بیش­تر بود. نرخ رشد نسبی حشرات کامل با وجود کاهش، در دزهای 400، 600، 800 و 1000 گری تفاوت معنی‌داری نشان نداد. نرخ مصرف نسبی غذا نیز کاهش معنی‌داری نشان داد که میزان آن با دز پرتو رابطه­ی عکس داشت. آزمایش­ها نشان داد که استفاده از پرتو گاما با دز تا 800 گری هیچ گونه تأثیر معنی‌داری بر شاخص کارآیی تبدیل غذای خورده شده­ی لاروها نداشت و تنها در دز 1000 گری کاهش معنی­دار مشاهده گردید. هم­چنین پرتو گاما اثر بازدارندگی تغذیه‌ای بالایی به ویژه در لاروهای شپشه­ی آرد نشان داد ولی این اثر در بین دزهای 100 تا 800 گری معنی‌دار نبود. براساس نتایج به دست آمده، پرتو گاما با تأثیر ضدتغذیه‌ای که ایجاد می‌کند می‌تواند عامل مؤثر در کنترل شپشه­ی آرد باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Gamma Radiation on Nutritional Indices of Larval and Adults Stages of Tribolium castaneum (Coleoptera: Tenebrionidae)

نویسندگان [English]

  • M Ahmadi 1
  • S Moharramipour 2
چکیده [English]

In this study antifeedant effect of different doses of gamma radiation as a controlling safe method on flour weevil, Tribolium castaneum (Herbst) larvae and adult was studied. Doses of 100, 400, 600, 800 and 1000Gy of gamma radiation were used and after 72 hours, nutritional indices were evaluated. The relative growth rate (RGR), relative consumption rate (RCR), efficiency of conversion of ingested food (ECI)and feeding deterrence index (FDI) as nutritional indices were evaluated. Treatments were assessed by flour wheat disc at 27±1˚C and 65% humidity in a dark condition. The results showed that the relative growth rate of flour weevil larvae and adults decreased significantly (P<0.05) by gamma radiation and the severity of this reduction in larvae was higher than the adults. Although the relative growth rates decreased in adults, this rate in doses of 400, 600, 800 and 1000Gy showed no significant difference. The relative food consumption rate also decreased with the gamma radiation and its value found to be inversely proportional to the dose radiation. Our experiments showed that the use of gamma radiation exposure to 800Gy had no significant effect on the efficiency of conversion of ingested food of larvae and reduction was observed only when the gamma radiation was used in 1000Gy. The feeding deterrence effect of gamma radiation, especially on the larvae was high but no significant difference between doses of 100 to 800Gy was observed. The results showed that gamma radiation that induces antifeedant effect can be applied as an effective method in control of T. castaneum.

کلیدواژه‌ها [English]

  • Gamma radiation
  • Relative Growth Rate
  • Relative Consumption Rate
  • Efficiency of Conversion of Ingested Food
  • Feeding Deterrent Index
  • Tribolium castaneum

 

 

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