Skip to main content
Research article - Peer-reviewed, 2020

Root-associated entomopathogenic fungi manipulate host plants to attract herbivorous insects

Cotes, Belen; Thoming, Gunda; Amaya-Gomez, Carol V.; Novak, Ondrej; Nansen, Christian

Abstract

Root-associated entomopathogenic fungi (R-AEF) indirectly influence herbivorous insect performance. However, host plant-R-AEF interactions and R-AEF as biological control agents have been studied independently and without much attention to the potential synergy between these functional traits. In this study, we evaluated behavioral responses of cabbage root flies [Delia radicum L. (Diptera: Anthomyiidae)] to a host plant (white cabbage cabbage Brassica oleracea var. capitata f. alba cv. Castello L.) with and without the R-AEF Metarhizium brunneum (Petch). We performed experiments on leaf reflectance, phytohormonal composition and host plant location behavior (behavioral processes that contribute to locating and selecting an adequate host plant in the environment). Compared to control host plants, R-AEF inoculation caused, on one hand, a decrease in reflectance of host plant leaves in the near-infrared portion of the radiometric spectrum and, on the other, an increase in the production of jasmonic, (+)-7-iso-jasmonoyl-l-isoleucine and salicylic acid in certain parts of the host plant. Under both greenhouse and field settings, landing and oviposition by cabbage root fly females were positively affected by R-AEF inoculation of host plants. The fungal-induced change in leaf reflectance may have altered visual cues used by the cabbage root flies in their host plant selection. This is the first study providing evidence for the hypothesis that R-AEF manipulate the suitability of their host plant to attract herbivorous insects.

Published in

Scientific Reports
2020, volume: 10, number: 1, article number: 22424
Publisher: NATURE RESEARCH

Authors' information

Cotes Ramal, Belén
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Thoming, Gunda
Norwegian Inst Bioecon Res
Amaya Gomez, Carol Viviana
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Amaya Gomez, Carol Viviana
Corporación colombiana de investigación agropecuaria (AGROSAVIA)
Institute of Experimental Botany of the Czech Academy of Sciences
Novak, Ondrej
Palacky University Olomouc
Nansen, Christian
University of California Davis

Associated SLU-program

SLU Network Plant Protection

UKÄ Subject classification

Microbiology
Botany

Publication Identifiers

DOI: https://doi.org/10.1038/s41598-020-80123-5

URI (permanent link to this page)

https://res.slu.se/id/publ/110454