N-butyryl-homoserine lactone, a bacterial quorum-sensing signaling molecule, induces intracellular calcium elevation in Arabidopsis root cells

► C4-HSL may act as an elicitor from bacteria in plant. ► Ca2+ signaling participates in the sensing of plant cells to bacterial QS signals. ► C4-HSL can promote a transient elevation in [Ca2+]cyt.