Abstract
The discovery of the BABA receptor: scientific implications and application potential.
Highlights
The most effective priming agent is β-aminobutyric acid (BABA). This non-protein amino acid primes defense reactions that are controlled by salicylic acid (SA)-dependent and -independent signaling pathways (Zimmerli et al, 2000; Ton et al, 2005), conferring protection in different plant species against an exceptionally broad spectrum of stresses, including microbial pathogens, herbivores, and abiotic stresses (Jakab et al, 2001; Cohen, 2002)
A screen for Arabidopsis mutants in BABA-IR against the biotrophic oomycete Hyaloperonospora arabidopsidis led to the identification of the Impaired in BABA-induced Immunity 1 (IBI1) gene, encoding an aspartyl-tRNA synthetase (AspRS)
The stereochemical similarity between the amino acid substrate of IBI1 (Laspartate; L-asp) and the active enantiomer of BABA (R-BABA) suggested that IBI1 might function as the BABA receptor
Summary
A potentially novel IPM tool is plant priming agents: stimuli that sensitize the plant’s immune system for augmented activation against future pathogen/herbivore attacks. Because priming leads to augmented activation of multi-genic defense mechanisms (Ton et al, 2006; Ahmad et al, 2010), the resulting resistance has the potential to be more durable than protection by single resistance (R-) genes.
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