NDLI: The effect of temperature on the diapause and cold hardiness of Dendrolimus tabulaeformis (Lepidoptera: Lasiocampidae)

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The effect of temperature on the diapause and cold hardiness of Dendrolimus tabulaeformis (Lepidoptera: Lasiocampidae)

Content Provider	Semantic Scholar
Author	Zeng, Ju-Ping Ge, Feng Su, Jian-Wei Wang, Yong
Copyright Year	2008
Abstract	Pine caterpillar, Dendrolimus tabulaeformis Tsai et Liu, is a major pine pest in North China. The larvae enter diapause in the third or fourth instar before winter. Supercooling points (SCP) and cold hardiness of the diapausing larvae were investigated and compared in non-acclimated, acclimated and de-acclimated larvae. A bimodal frequency distribution was observed with a break point of -14°C in the SCP. Larvae in the low group (LG, SCP d -14°C) were more cold tolerant with lower lethal temperatures than those in the high group (HG, SCP > -14°C). This bimodality occurred in three patterns, LG (> 60% of individuals in LG), LG-HG ( 60% of individuals in HG), in response to cold acclimation and de-acclimation. The cold hardiness was ranked as: LG > LG-HG > HG pattern. Cold hardiness was enhanced by an increase in concentrations of tre- halose, galactose, glucose and mannose in the haemolymph as well as by decrease in metabolism after cold acclimation, but was lost after de-acclimation. Loss of cold hardiness was correlated with decrease in sugars and increase in metabolic rate. In conclusion, the species is a chill tolerant insect, adopting the strategy of depressing SCP through accumulation of low molecular weight sugars in the haemolymph, concomitant with metabolic depression.
Starting Page	599
Ending Page	606
Page Count	8
File Format	PDF HTM / HTML
DOI	10.14411/eje.2008.080
Volume Number	105
Alternate Webpage(s)	http://www.eje.cz/pdfs/eje/2008/04/08.pdf
Alternate Webpage(s)	https://doi.org/10.14411/eje.2008.080
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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