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Significance Lignin deposition in plants is affected by environmental stress, and stress-signaling involves increases in the levels of the plant hormone abscisic acid (ABA). Here we show, using a combination of biochemical and genetic approaches, how ABA can regulate lignin biosynthesis. This involves phosphorylation of the master lignin transcription factor NST1 by a family of protein kinases (SnRK2s) that are themselves activated by phosphorylation as a result of ABA recognition by its receptor. This work provides a basis for designing trees and other biomass plants that are better adapted to stress and climate change.

Abscisic acid regulates secondary cell-wall formation and lignin deposition in Arabidopsis thaliana through phosphorylation of NST1