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http://dx.doi.org/10.5656/KSAE.2021.02.0.002

Cold Hardiness Change in Solenopsis japonica (Hymenoptera: Formicidae) by Rapid Cold Hardening  

Park, Youngjin (Plant Quarantine Technique Center, Animal and Plant Quarantine Agency)
Vatanparast, Mohammad (Plant Quarantine Technique Center, Animal and Plant Quarantine Agency)
Lee, Jieun (Plant Quarantine Technique Center, Animal and Plant Quarantine Agency)
Publication Information
Korean journal of applied entomology / v.60, no.2, 2021 , pp. 193-199 More about this Journal
Abstract
Solenopsis japonica, which is belonging to Formicidae in Hymenoptera, is a native ant species in Korea. However, it had not been studied for cold hardiness of S. japonica to understand on its overwintering mechanisms in field so far. Cold tolerance on developmental stages was measured at different cold temperature with various exposure times. Workers showed more survival at 5℃ and 10℃ compared with other stages and elevated cold tolerance when workers were exposed at 15℃ for more than 12h incubation as a rapid cold hardening (RCH) condition. RCH treatment not only increased survival of workers at cold temperatures, but also decreased supercooling point (SCP) and freezing point (FP). RCH group increased the survival rate by 44% at 10℃ compared with Non-RCH group. SCP and FP were depressed from -10.0 to -14.2℃ and from -11.3 to -15.3℃, respectively, after RCH treatment. Cold temperature increased expression level of cold- and stress-related genes such as glycerol kinase and heat shock protein. These results indicate unacclimated cold tolerance of S. japonica and its acclimation to low temperature by RCH.
Keywords
Solenopsis japonica; Cold hardiness; Rapid cold hardening; Supercooling point;
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