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Cold hardiness strategy in field collected larvae of Scrobipalpa ocellatella (Lepidoptera: Gelechiidae) | ||
| Journal of Entomological Society of Iran | ||
| مقاله 5، دوره 36، شماره 4 - شماره پیاپی 67، خرداد 2017، صفحه 287-296 اصل مقاله (262.28 K) | ||
| نویسندگان | ||
| Zahra Ganji1؛ Saeid Moharramipour* 2 | ||
| 1Agriculture & Natural resources Campus of Tehran University | ||
| 2Department of Entomology, Faculty of Agriculture, Tarbiat Modares University | ||
| چکیده | ||
| The beet moth, Scrobipalpa ocellatella is recognized as a widespread agricultural pest. Cold hardiness strategy of the beet moth larvae was investigated through monitoring seasonal changes at supercooling points and lower lethal temperatures. Furthermore, the role of microhabitat in winter survival was studied. The mean SCPs of the last instar larvae was not significantly different from November 2010 to April 2011. Mean inoculative freezing point (-8.0 ± 1.44 °C) of the last instar larvae was significantly higher than mean SCP (-14.9 ± 0.93 °C). The cold hardiness of the pest shows seasonal fluctuation in response to reduction of air temperature. A 50% mortality (LT50) occurred at -11 ºC in November and -14 ºC in January and reduced to -18 ºC in February and finally increased to -14.5 ºC in April. Glycerol, sorbitol, trehalose, and myo-inositol were identified components in whole body extracts of S. ocellatella larvae. However, total cryoprotectants could not have significant effects on the cold tolerance. Larvae of S. ocellatella could tolerate subzero temperatures near their SCPs. Our findings show that beet moth larvae utilize moderately chill tolerance strategy during winter. | ||
| کلیدواژه‌ها | ||
| Cold hardiness؛ inoculative freezing point؛ lower lethal temperature؛ beet moth؛ suprcooling point | ||
| عنوان مقاله [English] | ||
| استراتژی سرما سختی لاروهای بید چغندر قند Scrobipalpa ocellatella (Lepidoptera: Gelechiidae) جمع آوری شده از مزرعه | ||
| نویسندگان [English] | ||
| زهرا گنجی1؛ سعید محرمی پور2 | ||
| 1پردیس کشاورزی و منابع طبیعی دانشگاه تهران | ||
| 2گروه حشره شناسی دانشکده کشاورزی دانشگاه تربیت مدرس | ||
| چکیده [English] | ||
| The beet moth, Scrobipalpa ocellatella is recognized as a widespread agricultural pest. Cold hardiness strategy of the beet moth larvae was investigated through monitoring seasonal changes at supercooling points and lower lethal temperatures. Furthermore, the role of microhabitat in winter survival was studied. The mean SCPs of the last instar larvae was not significantly different from November 2010 to April 2011. Mean inoculative freezing point (-8.0 ± 1.44 °C) of the last instar larvae was significantly higher than mean SCP (-14.9 ± 0.93 °C). The cold hardiness of the pest shows seasonal fluctuation in response to reduction of air temperature. A 50% mortality (LT50) occurred at -11 ºC in November and -14 ºC in January and reduced to -18 ºC in February and finally increased to -14.5 ºC in April. Glycerol, sorbitol, trehalose, and myo-inositol were identified components in whole body extracts of S. ocellatella larvae. However, total cryoprotectants could not have significant effects on the cold tolerance. Larvae of S. ocellatella could tolerate subzero temperatures near their SCPs. Our findings show that beet moth larvae utilize moderately chill tolerance strategy during winter. | ||
| کلیدواژه‌ها [English] | ||
| Cold hardiness, inoculative freezing point, lower lethal temperature, beet mothlarvae, supercooling point, Iran | ||
| مراجع | ||
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