Involved in the biosynthesis of the siderophore pyochelin (PubMed:8982005). Specifically adenylates salicylate and loads it onto the holo form of PchE via a thioester linkage to the phosphopanthetheine moiety (By similarity). Is also involved in the synthesis of the antifungal antibiotic dihydroaeruginoic acid (Dha or hydroxyphenyl-thiazolinyl-carboxylate), a precursor of pyochelin (PubMed:8982005). ATP + holo-[non-ribosomal peptide synthase] + salicylate = AMP + diphosphate + salicyl-[non-ribosomal peptide synthase] Siderophore biosynthesis. Antifungal biosynthesis. Part of the pchDCBA operon. Is probably positively controlled by PchR. Repressed by iron. Insertion mutant does not produce Dha and pyochelin. Belongs to the ATP-dependent AMP-binding enzyme family.