Characterization of the voltage-gated sodium channel of the Asian citrus psyllid, Diaphorina citri

• 来源期刊: 中国昆虫科学（英文版）
• 关键词: citrus greening disease management knockdown resistance (kdr) target-site insensitivity
• 年，卷（期）: 2017,（1）
• 页码范围: 47-59
• 页数: 13页
• 语种: 英文
• DOI: 10.1111/1744-7917.12288

摘要

The Asian citrus psyllid,Diaphorina citri Kuwayama (Hemiptera:Liviidae),is an important insect pest of citrus.It is the vector of ‘Candidatus’ Liberibacter asiaticus,a phloem-limited bacterium that infects citrus,resulting in the disease Huanglongbing (HLB).Disease management relies heavily on suppression of D.citri populations with insecticides,including pyrethroids.In recent annual surveys to monitor insecticide resistance,reduced susceptibility to fenpropathrin was identified in several field populations ofD.citri.The primary target of pyrethroids is the voltage-gated sodium channel (VGSC).The VGSC is prone to target-site insensitivity because of mutations that either reduce pyrethroid binding and/or alter gating kinetics.These mutations,known as knockdown resistance or kdr,have been reported in a wide diversity of arthropod species.Alternative splicing,in combination with kdr mutations,has been also associated with reduced pyrethroid efficacy.Here we report the molecular characterization of the VGSC in D.citri along with a survey of alternative splicing across developmental stages of this species.Previous studies demonstrated that D.citri has an exquisite enzymatic arsenal to detoxify insecticides resulting in reduced efficacy.The results from the current investigation demonstrate that target-site insensitivity is also a potential basis for insecticide resistance to pyrethroids in D.citri.The VGSC sequence and its molecular characterization should facilitate early elucidation of the underlying cause of an established case of resistance to pyrethroids.This is the first characterization ofa VGSC from a hemipteran to this level of detail,with the majority of the previous studies on dipterans and lepidopterans.