با همکاری انجمن‏‌ بیماری شناسی گیاهی ایران

نوع مقاله : حشره شناسی کشاورزی

نویسندگان

1 دانش آموخته‌ی کارشناسی ارشد، گروه گیاه‌پزشکی، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران

2 دانشیار، گروه گیاه‌پزشکی، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران

3 استاد، گروه گیاه‌پزشکی، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران

چکیده

ذخیره‌سازی در سرما یک روش ارزشمند برای کاهش هزینه‌ها در تولید انبوه عوامل بیولوژیک می‌باشد. در بعضی از زنبورهای پارازیتوئید، رژیم دمایی نوسان‌دار (مواجهه‌ی طولانی با دمای پایین در ترکیب با دوره‌های کوتاه در دماهای بالاتر)، منجر به بهبود بقاء و باروری می‌شود. در این مطالعه شفیره‌های زنبور پارازیتوئید Lysiphlebus fabarum (Marshall) (Braconidae: Aphidiinae)، روی شته سیاه باقلا، Aphis fabae به مدت دو هفته در شرایط سرمای شش درجه‌ی سلسیوس (رطوبت نسبی 60-50 درصد و دوره نوری 14 ساعت روشنایی و 10 ساعت تاریکی)، ذخیره‌سازی شدند تا رفتار جفت‌گیری حشرات بالغ نوظهور و همچنین شایستگی نتاج آن‌ها در دو شرایط دمایی نوسان‌دار (روزانه دو ساعت در دمای 21 درجه سلسیوس) و ثابت مقایسه شود. نتایج نشان داد که حشرات نر ظاهر شده در شرایط دمایی نوسان‌دار برخلاف تیمار دمایی ثابت از نظر شناسایی بو، سرعت راه رفتن و جفت‌گیری موفق، تفاوت معنی‌داری با حشرات نر شاهد نداشت. همچنین نگهداری در سرما در شرایط نوسان‌دار تاثیری روی شایستگی نتاج نسل اول (درصد پارازیتیسم، درصد ظهور حشرات کامل و نسبت جنسی) نداشت. در مجموع نتایج نشان داد که نگهداری شفیره‌‌های زنبور پارازیتوئید L. fabarum در شرایط دمایی نوسان‌دار یک روش حفاظتی مؤثر محسوب می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The impact of cold storage on mating behavior of emerging adults and progeny fitness, in a parasitoid wasp, Lysiphlebus fabarum, under constant and fluctuating temperatures (Article in English)

نویسندگان [English]

  • H. MAHI 1
  • A. RASEKH 2
  • P. SHISHEHBOR 3

1 Former M.Sc. student, Department of Plant Protection, College of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Department of Plant Protection, College of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran

3 Department of Plant Protection, College of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran

چکیده [English]

Cold storage is a valuable method for reducing the cost of producing large amounts of biological agents. Fluctuating thermal regimes (prolonged exposures at low temperatures combined with periodic short higher temperature) are reported to improve cold survival and fecundity in some parasitoid species.  In this study, the pupal stage of the parasitoid wasp Lysiphlebus fabarum (Marshall) (Braconidae: Aphidiinae), within mummies of Aphis fabae were stored for a period of two weeks at 6±1°C (50–60% RH, L14:D10 photoperiod), and the mating behavior of emerging adults and fitness of their progeny were compared under fluctuating thermal regime (2 h daily at 21°C) versus constant low temperature. Results revealed that the males emerging from fluctuating temperature regime, in contrast to constant temperature treatment, were not significantly different from the control males in odour recognition, walking speed, and number of mating success. Moreover, the fitness of the first generation progenies (percent parasitism, percent adult emergence and sex ratio) was not influenced by cold storage under fluctuating temperature treatment. Our results confirmed that cold storage of L. fabarum pupae under fluctuating regime is a protection method when compared to constant low temperature exposure.

کلیدواژه‌ها [English]

  • Aphis fabae
  • Aphidiidae
  • mating behavior
  • odour recognition
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