Li Yongteng, Zhang Yueliang, Liu Xiangdong, Guo Huifang
Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Weigang No. 1, Nanjing, 210095, China.
Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
Environ Entomol. 2017 Aug 1;46(4):988-994. doi: 10.1093/ee/nvx101.
There is ample evidence that insecticide resistance causes fitness costs and benefits in pests, while the impact of insecticide resistance on thermotolerance of pests is mostly unclear. The Laodelphax striatellus (Fallén), is an important rice insect pest, which has developed resistance to buprofezin in China. Here, we investigated differences in heat tolerance and cold tolerance among L. striatellus lines with variable buprofezin resistance. The lethal time for 50% of the individuals to die (LT50) at 40 °C increased with an increase in buprofezin resistance level, whereas both the survival rate under -22 °C and the supercooling point of planthoppers did not differ significantly between resistant and susceptible strains. The metabolic enzyme carboxylesterase was found to have an association with buprofezin resistance. Our research showed that buprofezin resistance was positively related with heat tolerance in L. striatellus, but it had no effect on cold tolerance. Insecticide resistance in L. striatellus may therefore have broader implications for the ecology of L. striatellus, and the management of buprofezin resistance in this pest may be challenging.
有充分证据表明，杀虫剂抗性在害虫中会产生适应性成本和收益，而杀虫剂抗性对害虫耐热性的影响大多尚不清楚。灰飞虱（Laodelphax striatellus (Fallén)）是一种重要的水稻害虫，在中国已对噻嗪酮产生抗性。在此，我们研究了不同噻嗪酮抗性水平的灰飞虱品系在耐热性和耐寒性方面的差异。在40°C下50%个体死亡的致死时间（LT50）随着噻嗪酮抗性水平的提高而增加，而在-22°C下的存活率和飞虱的过冷却点在抗性品系和敏感品系之间没有显著差异。发现代谢酶羧酸酯酶与噻嗪酮抗性有关。我们的研究表明，灰飞虱对噻嗪酮的抗性与耐热性呈正相关，但对耐寒性没有影响。因此，灰飞虱的杀虫剂抗性可能对灰飞虱的生态学有更广泛的影响，并且对这种害虫噻嗪酮抗性的管理可能具有挑战性。
