Cold Tolerance and Cold-Resistant Substances in Two Tomicus Species during Critical Transferring Periods

Xiukui Pan, Siyu Chen, Qiyan Peng, Li Guo, Lei Gao, Zhen Zhang, Maofa Yang and Chengxu Wu ()
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Xiukui Pan: College of Forestry, Guizhou University, Guiyang 550025, China
Siyu Chen: College of Forestry, Guizhou University, Guiyang 550025, China
Qiyan Peng: College of Forestry, Guizhou University, Guiyang 550025, China
Li Guo: School of Biological Science and Engineering, Xingtai University, Xingtai 054001, China
Lei Gao: Key Laboratory of National Forestry and Grassland Administration on Ecological Landscaping of Challenging Urban Sites, Shanghai Academy of Landscape Architecture Science and Planning, Shanghai 200232, China
Zhen Zhang: Key Laboratory of Forest Protection of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
Maofa Yang: Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Institute of Entomology, Ministry of Agriculture, Guizhou University, Guiyang 550025, China
Chengxu Wu: College of Forestry, Guizhou University, Guiyang 550025, China

Agriculture, 2022, vol. 13, issue 1, 1-12

Abstract: The pine shoot beetles Tomicus minor and Tomicus yunnanensis are important stem borers of Pinus yunnanensis in southwestern China. To determine strategies for cold resistance and changes in major cold-resistant substances in adults of two Tomicus species during two critical transferring periods, “shoot-to-trunk” and “trunk-to-shoot”, the insects’ supercooling point (SCP), freezing point (FP), and antifreeze protective substances were determined. The SCP and FP did not differ between female and male adults in the shoot-to-trunk phase, but were significantly lower in females in the trunk-to-shoot period. Although there was no difference in the SCP and FP between the two Tomicus species adults, both indexes were significantly lower in the shoot-to-trunk period than in the trunk-to-shoot period. The trehalose content in females of two Tomicus species was significantly lower than that in males in the trunk-to-shoot period, and the protein, glycerol, glycogen, fat, and sorbitol contents were different between the species in the same period. The protein and water content in adults of both species were significantly lower in the shoot-to-trunk period than in the trunk-to-shoot period, but the content of glycerol, trehalose, water, sorbitol, glycogen, and fat content were significantly higher in the shoot-to-trunk. Different types of cold-resistant substances regulating sex, species, and developmental stages were found, and the most abundant were cold-resistant substances regulating developmental stages.

Keywords: Tomicus minor; Tomicus yunnanensis; bark beetle; supercooling point; freezing point; cold-resistant substance (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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