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Eurydema oleracea negatively affects defenses in Arabidopsis by inducing salicylic acid-mediated signaling pathway

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Abstract

The study of defense mechanisms of plants against herbivorous insects can clarify the evolutionary mechanisms of these interactions and has significant implications for agriculture. The herbivore Eurydema oleracea is an invasive crop pest; however, knowledge on how it affects plant immune responses is lacking. In the present study, we demonstrate that insect feeding causes the induction of both salicylic acid (SA) and jasmonic acid (JA)-mediated signaling pathways in infested Arabidopsis plants. Using transgenic SA-deficient NahG, we show that the two phytohormones crosstalk antagonistically. In particular, the rapid and strong induction of SA-related gene expression partially suppresses the JA-dependent signaling pathway. This results in increased plant susceptibility to the herbivore, evidenced by an increase of leaf damage inflicted by the adult insects and increased development of the nymphs. Our findings suggest that E. oleracea manipulates hormone signaling components of Arabidopsis as a strategy of attack to suppress plant defense traits. Our work contributes to knowledge on the adaptation of insect pests to plant responses, and is useful for developing management strategies to combat harmful herbivores in agriculture.

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Funding

This work was supported by the “Fondo di Ateneo per la Ricerca di Base 2017” financed by University of Perugia.

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LE, GS and SP conceived and designed the experiments; LE, GS, CB performed the experiments and analyzed the data; all of the authors interpreted the results, drafted and revised the manuscript.

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Correspondence to Luisa Ederli.

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The authors declare that they have no conflicts of interest.

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All applicable international, national and/or institutional guidelines for the care and use of animals were followed. This article does not contain any studies with human participants performed by any of the authors.

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Communicated by Ritu Chaudhary.

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Ederli, L., Salerno, G., Bianchet, C. et al. Eurydema oleracea negatively affects defenses in Arabidopsis by inducing salicylic acid-mediated signaling pathway. Arthropod-Plant Interactions 14, 139–148 (2020). https://doi.org/10.1007/s11829-019-09728-6

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  • DOI: https://doi.org/10.1007/s11829-019-09728-6

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