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Olfactory co‐receptor Orco stimulated by Rice stripe virus is essential for host seeking behavior in small brown planthopper
Author(s) -
Li Shuo,
Zhou Changwei,
Zhou Yijun
Publication year - 2019
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.5086
Subject(s) - brown planthopper , biology , olfaction , context (archaeology) , host (biology) , pest analysis , insect , olfactory receptor , botany , genetics , ecology , gene , paleontology
BACKGROUND Laodelphax striatellus , the small brown planthopper (SBPH), is an economically important pest, besides sucking damage, which transmits rice viruses to cause severe damages to rice. In the process of virus transmission, the host orientation behavior of insect is mainly driven by olfaction. In this context, the molecular basis of olfaction in SBPH is of particular interest. RESULTS Here, we identified the gene that encodes olfactory receptor co‐receptor (Orco) and analyzed its expression profiles in Rice stripe virus (RSV)‐infected and RSV‐free SBPH. It was found that LstrOrco shared high identity with other Orcos from different order insects. LstrOrco was mainly expressed in the head of SBPH, and its expression was significantly stimulated by RSV‐infection. The behavioral bioassay revealed that viruliferous SBPH might have a stronger olfactory and seeking ability for rice than RSV‐free insect. After silencing of LstrOrco expression, the olfaction and seeking behavior of nymphs for rice seedlings was significantly inhibited, mainly in the increase of the ‘no response’ percent and the prolongation of the response time. CONCLUSION These results suggested that Orco played an important role in olfactory signaling and seeking behavior of SBPH, which provided a basic for future development of olfactory‐based agriculture pest management strategies. © 2018 Society of Chemical Industry