Back to Search Start Over

Mechanisms of Insecticidal Action of Metarhizium anisopliae on Adult Japanese Pine Sawyer Beetles (Monochamus alternatus)

Authors :
Ho Myeong Kim
Jong Cheol Kim
Hae Woong Park
Seul-Gi Jeong
Jung Eun Yang
In Seong Choi
Jae Su Kim
Kwang Ho Lee
Junheon Kim
Source :
ACS Omega, ACS Omega, Vol 5, Iss 39, Pp 25312-25318 (2020)
Publication Year :
2020
Publisher :
American Chemical Society (ACS), 2020.

Abstract

Pine wilt disease, caused by Bursaphelenchus xylophilus (pine wood nematode), leads to severe environmental and economic damage. Here, we report the results of experiments on the biological control of pine wilt disease through termination of the insect vector of the nematode and the mechanism of the insecticidal action of Metarhizium anisopliae JEF-279 against Monochamus alternatus (Japanese pine sawyer). A combined treatment with a fungal conidia suspension and a fungal protease-containing culture filtrate caused 75.8% mortality of the insect vector. Additionally, the presence of destruxins was confirmed in the dead Japanese pine sawyer adults, and half of the 10 protein spots in proteomic analysis were identified as an actin related to muscle contraction. Based on proteomic and microscopic analyses, the infection cycle of the Japanese pine sawyer by M. anisopliae JEF-279 was inferred to proceed in the following sequence: (1) host adhesion and germination, (2) epicuticle degradation, (3) growth as blastospore, (4) killing by various fungal toxins (insecticidal metabolites), (5) immune response as defense mechanism, and (6) hyphal extrusion and conidiation. Consequently, the combined fungal conidia suspension and protease-containing culture filtrate treatment may be applied as an insecticidal agent, and flaccid paralysis is likely a major mechanism underlying the insecticidal action of M. anisopliae JEF-279 on host insects.

Details

ISSN :
24701343
Volume :
5
Database :
OpenAIRE
Journal :
ACS Omega
Accession number :
edsair.doi.dedup.....32913a55930277b31f6e625039acbfb6