Abstract：
:Specific chemicals can prime the plant immune system for augmented defense. β-aminobutyric acid (BABA) is a priming agent that provides broad-spectrum disease protection. However, BABA also suppresses plant growth when applied in high doses, which has hampered its application as a crop defense activator. Here we describe a mutant of Arabidopsis thaliana that is impaired in BABA-induced disease immunity (ibi1) but is hypersensitive to BABA-induced growth repression. IBI1 encodes an aspartyl-tRNA synthetase. Enantiomer-specific binding of the R enantiomer of BABA to IBI1 primed the protein for noncanonical defense signaling in the cytoplasm after pathogen attack. This priming was associated with aspartic acid accumulation and tRNA-induced phosphorylation of translation initiation factor eIF2α. However, mutation of eIF2α-phosphorylating GCN2 kinase did not affect BABA-induced immunity but relieved BABA-induced growth repression. Hence, BABA-activated IBI1 controls plant immunity and growth via separate pathways. Our results open new opportunities to separate broad-spectrum disease resistance from the associated costs on plant growth.
journal_name
Nat Chem Bioljournal_title
Nature chemical biologyauthors
Luna E,van Hulten M,Zhang Y,Berkowitz O,López A,Pétriacq P,Sellwood MA,Chen B,Burrell M,van de Meene A,Pieterse CM,Flors V,Ton Jdoi
10.1038/nchembio.1520subject
Has Abstractpub_date
2014-06-01 00:00:00pages
450-6issue
6eissn
1552-4450issn
1552-4469pii
nchembio.1520journal_volume
10pub_type
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