N-hexanoyl-DL-Homoserine lactone is a bacterial quorum sensing signaling molecule that is produced by mammalian pathogenic and rhizosphere-colonizing bacteria.^1,2,3Application of N-hexanoyl-DL-homoserine lactone (60 µM) to tomato leaves suppresses the development of lesions induced by the plant pathogenic fungiB. cinerea.²It also increases root length and shoot diameter when applied toA. thalianaseedlings in a hydroponic growth system at a concentration of 10 µM.³

1.Ngeow, Y.F., Cheng, H.J., Chen, J.W., et al.Short chain N-acylhomoserine lactone production by clinical multidrug resistant Klebsiella pneumoniae strain CSG20Sensors (Basel)13(11)15242-15251(2013) 2.Hu, Z., Shao, S., Zheng, C., et al.Induction of systemic resistance in tomato against Botrytis cinerea by N-decanoyl-homoserine lactone via jasmonic acid signalingPlanta247(5)1217-1227(2018) 3.von Rad, U., Klein, I., Dobrev, P.I., et al.Response of Arabidopsis thaliana to N-hexanoyl-??-homoserine-lactone, a bacterial quorum sensing molecule produced in the rhizospherePlanta229(1)73-85(2008)