Ten articles published in the "Special Issue: Salicylic Acid Signalling in Plants" are summarized, in order to get a global picture about the mode of action of salicylic acid in plants, and about its interaction with other stress-signalling routes. Its ecological aspects and possible practical use are also discussed.
Keywords: acclimation; biosynthesis; cross talk; hormones; phenolics; plant growth and development; plant stress; salicylic acid; signalling.