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Cooling rate and starvation affect supercooling point and cold tolerance of the Khapra beetle, Trogoderma granarium Everts fourth instar larvae (Coleoptera: Dermestidae).
J Therm Biol. 2018 Jan; 71:24-31.JT

Abstract

Trogoderma granarium Everts (Coleoptera: Dermestidae) is an important insect pest of stored products. In this study, the survival strategies of T. granarium fourth instar larvae were investigated at different sub-zero temperatures following different cooling rates, acclimation to different relative humidity (RH) and different starvation times. Our results show that larvae of T. granarium are freeze-intolerant. There was a strong link between cooling rates and supercooling point, which means the slower the decrease in temperature, the lower the supercooling point. Trehalose content was greater in insects cooled at a rate of 0.5°C/min. According to results, the RH did not affect supercooling point. However, acclimation to an RH of 25% increased mortality following exposure to - 10°C/24h. The time necessary to reach 95% mortality was 1737h and 428h at - 5°C and - 10°C. The lowest lipid and trehalose content was detected in insects acclimated to 25% RH, although, the different RH treatments did not significantly affect glycogen content of T. granarium larvae. The supercooling point of larvae was gradually increased following starvation. By contrast, fed larvae had the greatest lipid, glycogen, and trehalose content, and insects starved for eight days had the lowest energy contents. There was a sharp decline in the survival of larvae between - 11 and - 18°C after 1h exposure. Our results indicate the effects of cooling rate and starvation on energy reserves and survival of T. granarium. We conclude that T. granarium may not survive under similar stress conditions of the stored products.

Authors+Show Affiliations

Department of Plant Protection, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran. Electronic address: m.mohammadzadeh@stu.vru.ac.ir.Department of Plant Protection, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29301697

Citation

Mohammadzadeh, M, and H Izadi. "Cooling Rate and Starvation Affect Supercooling Point and Cold Tolerance of the Khapra Beetle, Trogoderma Granarium Everts Fourth Instar Larvae (Coleoptera: Dermestidae)." Journal of Thermal Biology, vol. 71, 2018, pp. 24-31.
Mohammadzadeh M, Izadi H. Cooling rate and starvation affect supercooling point and cold tolerance of the Khapra beetle, Trogoderma granarium Everts fourth instar larvae (Coleoptera: Dermestidae). J Therm Biol. 2018;71:24-31.
Mohammadzadeh, M., & Izadi, H. (2018). Cooling rate and starvation affect supercooling point and cold tolerance of the Khapra beetle, Trogoderma granarium Everts fourth instar larvae (Coleoptera: Dermestidae). Journal of Thermal Biology, 71, 24-31. https://doi.org/10.1016/j.jtherbio.2017.10.007
Mohammadzadeh M, Izadi H. Cooling Rate and Starvation Affect Supercooling Point and Cold Tolerance of the Khapra Beetle, Trogoderma Granarium Everts Fourth Instar Larvae (Coleoptera: Dermestidae). J Therm Biol. 2018;71:24-31. PubMed PMID: 29301697.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cooling rate and starvation affect supercooling point and cold tolerance of the Khapra beetle, Trogoderma granarium Everts fourth instar larvae (Coleoptera: Dermestidae). AU - Mohammadzadeh,M, AU - Izadi,H, Y1 - 2017/10/23/ PY - 2017/06/25/received PY - 2017/10/10/revised PY - 2017/10/21/accepted PY - 2018/1/6/entrez PY - 2018/1/6/pubmed PY - 2018/7/28/medline KW - Cooling rates KW - Energy contents KW - Relative humidity KW - Starvation KW - The Khapra beetle SP - 24 EP - 31 JF - Journal of thermal biology JO - J Therm Biol VL - 71 N2 - Trogoderma granarium Everts (Coleoptera: Dermestidae) is an important insect pest of stored products. In this study, the survival strategies of T. granarium fourth instar larvae were investigated at different sub-zero temperatures following different cooling rates, acclimation to different relative humidity (RH) and different starvation times. Our results show that larvae of T. granarium are freeze-intolerant. There was a strong link between cooling rates and supercooling point, which means the slower the decrease in temperature, the lower the supercooling point. Trehalose content was greater in insects cooled at a rate of 0.5°C/min. According to results, the RH did not affect supercooling point. However, acclimation to an RH of 25% increased mortality following exposure to - 10°C/24h. The time necessary to reach 95% mortality was 1737h and 428h at - 5°C and - 10°C. The lowest lipid and trehalose content was detected in insects acclimated to 25% RH, although, the different RH treatments did not significantly affect glycogen content of T. granarium larvae. The supercooling point of larvae was gradually increased following starvation. By contrast, fed larvae had the greatest lipid, glycogen, and trehalose content, and insects starved for eight days had the lowest energy contents. There was a sharp decline in the survival of larvae between - 11 and - 18°C after 1h exposure. Our results indicate the effects of cooling rate and starvation on energy reserves and survival of T. granarium. We conclude that T. granarium may not survive under similar stress conditions of the stored products. SN - 0306-4565 UR - https://www.unboundmedicine.com/medline/citation/29301697/Cooling_rate_and_starvation_affect_supercooling_point_and_cold_tolerance_of_the_Khapra_beetle_Trogoderma_granarium_Everts_fourth_instar_larvae__Coleoptera:_Dermestidae__ DB - PRIME DP - Unbound Medicine ER -