N-3-oxo-butyryl-L-Homoserine lactone is a bacterial quorum-sensing signaling molecule.1 It induces expression of rhiI in R. leguminosarum, a gene with roles in the interaction of the rhizosphere with legumes.
1.Rodelas, B., Lithgow, J.K., Wisniewski-Dye, F., et al.Analysis of quorum-sensing-dependent control of rhizosphere-expressed (rhi) genes in Rhizobium leguminosarum bv. viciaeJ. Bacteriol.181(12)3816-3823(1999)