Aphid-derived protein elicitors trigger distinct plant innate immune responses that are dependent on BAK1 and PAD3. The importance of pathogen-associated molecular pattern-triggered immunity (PTI) against microbial pathogens has been recently demonstrated. However, it is currently unclear if this layer of immunity mediated by surface-localized pattern recognition receptors (PRRs) also plays a role in basal resistance to insects, such as aphids. Here, we show that PTI is an important component of plant innate immunity to insects. Extract of the green peach aphid (GPA; Myzus persicae) triggers responses characteristic of PTI in Arabidopsis (Arabidopsis thaliana). Two separate eliciting GPA-derived fractions trigger induced resistance to GPA that is dependent on the leucine-rich repeat receptor-like kinase BRASSINOSTEROID INSENSITIVE1-ASSOCIATED KINASE1 (BAK1)/SOMATIC-EMBRYOGENESIS RECEPTOR-LIKE KINASE3, which is a key regulator of several leucine-rich repeat-containing PRRs. BAK1 is required for GPA elicitor-mediated induction of reactive oxygen species and callose deposition. Arabidopsis bak1 mutant plants are also compromised in immunity to the pea aphid (Acyrthosiphon pisum), for which Arabidopsis is normally a nonhost. Aphid-derived elicitors induce expression of PHYTOALEXIN DEFICIENT3 (PAD3), a key cytochrome P450 involved in the biosynthesis of camalexin, which is a major Arabidopsis phytoalexin that is toxic to GPA. PAD3 is also required for induced resistance to GPA, independently of BAK1 and reactive oxygen species production. Our results reveal that plant innate immunity to insects may involve early perception of elicitors by cell surface-localized PRRs, leading to subsequent downstream immune signaling.
The Leucine-Rich Repeat Receptor-Like Kinase BRASSINOSTEROID INSENSITIVE1-ASSOCIATED KINASE1 and the Cytochrome P450 PHYTOALEXIN DEFICIENT3 Contribute to Innate Immunity to Aphids in Arabidopsis1[C][W][OPEN]
David C. Prince,Claire Drurey,C. Zipfel,S. Hogenhout
Published 2014 in Plant Physiology
ABSTRACT
PUBLICATION RECORD
- Publication year
2014
- Venue
Plant Physiology
- Publication date
2014-02-28
- Fields of study
Biology, Medicine, Environmental Science
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- arabidopsis thaliana
The model plant species used to assay aphid elicitor responses and insect resistance.
Aliases: Arabidopsis
- bak1 mutant plants
Arabidopsis plants carrying mutations in BAK1 used to test the role of this kinase in aphid immunity.
Aliases: bak1 mutants
- bak1/somatic-embryogenesis receptor-like kinase3
A leucine-rich repeat receptor-like kinase pair involved in receptor-like pattern recognition signaling in Arabidopsis.
Aliases: BAK1, SERK3
- callose deposition
The accumulation of callose at cell walls as a plant defense-associated response.
Aliases: callose accumulation
- camalexin
An Arabidopsis phytoalexin that functions as an antimicrobial secondary metabolite.
- gpa-derived elicitor fractions
Separate fractions isolated from green peach aphid extracts that retain elicitor activity in Arabidopsis assays.
Aliases: eliciting GPA-derived fractions
- green peach aphid (gpa)
The aphid species Myzus persicae used as the insect source for extracts and elicitor fractions in this paper.
Aliases: GPA, Myzus persicae, green peach aphid
- induced resistance to gpa
A heightened Arabidopsis resistance state measured after exposure to aphid-derived elicitors and challenge with GPA.
Aliases: GPA resistance, induced resistance
- pad3
The Arabidopsis cytochrome P450 PHYTOALEXIN DEFICIENT3 involved in camalexin biosynthesis.
Aliases: PHYTOALEXIN DEFICIENT3
- pattern-triggered immunity
A layer of plant innate immunity initiated by perception of conserved elicitors at the cell surface.
Aliases: PTI
- pea aphid
Acyrthosiphon pisum, an aphid species used as a nonhost insect challenge in Arabidopsis.
Aliases: Acyrthosiphon pisum
- reactive oxygen species
Short-lived oxygen-derived molecules produced during early immune signaling in plant cells.
Aliases: ROS
REFERENCES
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