Involved in the biosynthesis of the siderophore pyochelin (PubMed:10555976). Specifically adenylates salicylate and loads it onto the holo form of PchE via a thioester linkage to the phosphopanthetheine moiety (PubMed:10555976). Is also involved in the synthesis of the antifungal antibiotic dihydroaeruginoic acid (Dha or hydroxyphenyl-thiazolinyl-carboxylate), a precursor of pyochelin (By similarity). ATP + holo-[non-ribosomal peptide synthase] + salicylate = AMP + diphosphate + salicyl-[non-ribosomal peptide synthase] kcat is 74 min(-1) with salicylate as substrate. Siderophore biosynthesis. Antifungal biosynthesis. Belongs to the ATP-dependent AMP-binding enzyme family.