Chemical priming of immunity without costs to plant growth
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Otros documentos de la autoría: Buswell, Will; Schwarzenbacher, Roland E.; Luna Diez, Estrella; Sellwood, Matthew A.; Chen, Beining; Flors, Victor; Pétriacq, Pierre; Ton, Jurriaan
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Título
Chemical priming of immunity without costs to plant growthAutoría
Fecha de publicación
2018Editor
WileyISSN
0028-646X; 1469-8137Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.15062Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
b-Aminobutyric acid (BABA) induces broad-spectrum disease resistance, but also represses
plant growth, which has limited its exploitation in crop protection. BABA perception relies on
binding to the aspartyl-tRNA ... [+]
b-Aminobutyric acid (BABA) induces broad-spectrum disease resistance, but also represses
plant growth, which has limited its exploitation in crop protection. BABA perception relies on
binding to the aspartyl-tRNA synthetase (AspRS) IBI1, which primes the enzyme for secondary
defense activity. This study aimed to identify structural BABA analogues that induce
resistance without stunting plant growth.
Using site-directed mutagenesis, we demonstrate that the (L)-aspartic acid-binding domain
of IBI1 is critical for BABA perception. Based on interaction models of this domain, we
screened a small library of structural BABA analogues for growth repression and induced resistance
against biotrophic Hyaloperonospora arabidopsidis (Hpa).
A range of resistance-inducing compounds were identified, of which (R)-b-homoserine
(RBH) was the most effective. Surprisingly, RBH acted through different pathways than BABA.
RBH-induced resistance (RBH-IR) against Hpa functioned independently of salicylic acid, partially
relied on camalexin, and was associated with augmented cell wall defense. RBH-IR
against necrotrophic Plectosphaerella cucumerina acted via priming of ethylene and jasmonic
acid defenses. RBH-IR was also effective in tomato against Botrytis cinerea. Metabolic profiling
revealed that RBH, unlike BABA, does not majorly affect plant metabolism.
RBH primes distinct defense pathways against biotrophic and necrotrophic pathogens without
stunting plant growth, signifying strong potential for exploitation in crop protection. [-]
Publicado en
New Phytologist (2018) 218Derechos de acceso
info:eu-repo/semantics/openAccess
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