Botsch Jamieson C, Daniels Jesse D, Roeder Karl A
Department of Biology, Austin Peay State University, Clarksville, TN, USA.
Oak Ridge Associated Universities, Oak Ridge, TN, USA.
J Insect Sci. 2025 Mar 14;25(2). doi: 10.1093/jisesa/ieaf043.
Insect responses to warming temperatures are determined partly by their physiology, which is influenced by genetic factors and plasticity induced by past temperature exposure. The effect that prior high temperature exposure has on insect thermal tolerance is complex and depends on the degree of heat stress experienced; high heat exposure may allow for individuals to tolerate higher temperatures through hardening or may reduce an individual's capacity to withstand higher temperatures through accumulated heat stress. In this study, we assessed how short exposures to high temperatures and a laboratory colony's geographical origin affected the critical thermal maximum (CTmax) of western corn rootworm (Diabrotica virgifera virgifera LeConte), an economically important pest. Despite a wide latitudinal range of source populations, western corn rootworm colonies did not differ in their CTmax. Regardless of colony origin, we found that exposing western corn rootworm to higher temperatures resulted in lower CTmax, which suggests that heat stress accumulated. This study highlights how western corn rootworm experiences heat stress at temperatures near the temperatures they experience in the field, which may have important and currently unknown implications for its behavior.
昆虫对气温升高的反应部分取决于其生理机能，而生理机能受遗传因素以及过去温度暴露所诱导的可塑性影响。先前高温暴露对昆虫耐热性的影响很复杂，且取决于所经历的热应激程度；高温暴露可能会使个体通过硬化来耐受更高温度，或者可能会因累积的热应激而降低个体承受更高温度的能力。在本研究中，我们评估了短时间高温暴露以及实验室种群的地理起源如何影响西部玉米根萤叶甲（Diabrotica virgifera virgifera LeConte）的临界热最大值（CTmax），这是一种具有经济重要性的害虫。尽管源种群的纬度范围很广，但西部玉米根萤叶甲种群的临界热最大值并无差异。无论种群起源如何，我们发现将西部玉米根萤叶甲暴露于更高温度会导致临界热最大值降低，这表明热应激出现了累积。这项研究凸显了西部玉米根萤叶甲在接近其田间经历温度的条件下如何承受热应激，这可能对其行为产生重要且目前未知的影响。
