**Tibor Janda \*, Gabriella Szalai and Magda Pál**

Department of Plant Physiology, Agricultural Institute, Centre for Agricultural Research, H-2462 Martonvásár, Hungary; szalai.gabriella@agrar.mta.hu (G.S.); pal.magda@agrar.mta.hu (M.P.)

**\*** Correspondence: janda.tibor@agrar.mta.hu; Tel.: +36-22-569509

Received: 7 April 2020; Accepted: 8 April 2020; Published: 10 April 2020

**Abstract:** 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
