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Insect eggs trigger systemic acquired resistance against a fungal and an oomycete pathogen
Author(s) -
Alfonso Esteban,
Stahl Elia,
Glauser Gaétan,
Bellani Etienne,
Raaymakers Tom M.,
Van den Ackerveken Guido,
Zeier Jürgen,
Reymond Philippe
Publication year - 2021
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.17732
Subject(s) - oomycete , pseudomonas syringae , botrytis cinerea , biology , systemic acquired resistance , pathogen , salicylic acid , microbiology and biotechnology , botany , insect , mutant , arabidopsis , genetics , gene
Summary Plants are able to detect insect eggs deposited on leaves. In Arabidopsis, eggs of the butterfly species Pieris brassicae (common name large white) induce plant defenses and activate the salicylic acid (SA) pathway. We previously discovered that oviposition triggers a systemic acquired resistance (SAR) against the bacterial hemibiotroph pathogen Pseudomonas syringae . Here, we show that insect eggs or treatment with egg extract (EE) induce SAR against the fungal necrotroph Botrytis cinerea BMM and the oomycete pathogen Hyaloperonospora arabidopsidis Noco2. This response is abolished in ics1 , ald1 and fmo1 , indicating that the SA pathway and the N‐hydroxypipecolic acid (NHP) pathway are involved. Establishment of EE‐induced SAR in distal leaves potentially involves tryptophan‐derived metabolites, including camalexin. Indeed, SAR is abolished in the biosynthesis mutants cyp79B2 cyp79B3 , cyp71a12 cyp71a13 and pad3‐1, and camalexin is toxic to B. cinerea in vitro . This study reveals an interesting mechanism by which lepidopteran eggs interfere with plant–pathogen interactions.