Molecular characterization and evolution of a chemosensory receptor gene family in three notorious rice planthoppers, Nilaparvata lugens, Sogatella furcifera and Laodelphax striatellus, based on genome and transcriptome analyses

Conserved odorant co‐receptor (Orco) genes are closely related to insect olfaction. Knockdown Orco rice planthoppers lose much of their olfactory ability and fail to seek out rice plants. BACKGROUND The white‐backed planthopper (WBPH) Sogatella furcifera, the brown planthopper (BPH) Nilaparvata luge...

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Published in:Pest management science 2018-09, Vol.74 (9), p.2156-2167
Main Authors: He, Peng, Engsontia, Patamarerk, Chen, Guang‐Lei, Yin, Qian, Wang, Jun, Lu, Xu, Zhang, Ya‐Nan, Li, Zhao‐Qun, He, Ming
Format: Article
Language:English
Subjects:
Allelochemicals
Anosmia
Chemoreception
Gene expression
Genes
genome
Genomes
Host searching behavior
Ion channels (ligand-gated)
Laodelphax striatellus
Nilaparvata lugens
odorant receptor, gustatory receptor, ionotropic receptor
Odorant receptors
Organic chemistry
Pest control
Pests
Phylogeny
Receptors
Ribonucleic acid
Rice
rice planthoppers
RNA
RNA-mediated interference
Sogatella furcifera
Taste receptors
Viruses
Volatile compounds
Volatiles
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Summary:Conserved odorant co‐receptor (Orco) genes are closely related to insect olfaction. Knockdown Orco rice planthoppers lose much of their olfactory ability and fail to seek out rice plants. BACKGROUND The white‐backed planthopper (WBPH) Sogatella furcifera, the brown planthopper (BPH) Nilaparvata lugens, and the small brown planthopper (SBPH) Laodelphax striatellus (Hemiptera: Delphacidae) are rice pests that damage rice plants by sap‐sucking and by transmitting viruses. Host‐seeking behavior involves chemosensory receptor genes that include odorant receptors (ORs), ionotropic receptors (IRs) and gustatory receptors (GRs). RESULTS We used genome and transcriptome data to identify 141 ORs, 28 GRs and 25 IRs in BPH; 135 ORs, 18 GRs and 16 IRs in WBPH; and 37 ORs, 14 GRs and 6 IRs in SBPH. A phylogenetic analysis identified several specific OR clades of rice planthoppers, the results indicating that these OR members might be used to respond to specific host volatiles. OR co‐receptor (Orco) is the most conserved and essential OR gene among these species and RNA interference (RNAi) can decrease their mRNA expression level to
ISSN:1526-498X
1526-4998
DOI:10.1002/ps.4912