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Certain plant cells synthesize secondary cell walls besides primary cell walls. This biosynthesis is strictly controlled by an array of transcription factors. Here, we show that SND1, a regulator of cell-wall biosynthesis, regulates abscisic acid (ABA) biosynthesis to ensure optimal plant growth. In  Arabidopsis , the lack of SND1 and its homolog NST1 leads to the deficiency of secondary cell walls, preventing  snd1nst1  double mutant seedlings from growing upright. Compared to wild type seedlings, the  snd1  knockout mutant seedlings accumulated less anthocyanin and exhibited low tolerance to salt stress. Compared to wild type seedlings, the  snd1  knockout seedlings were more sensitive to salt stress. Although SND1 can bind to the promoter of  Myb46 , we observed that SND1 binds directly to the promoter of the  ABI4  gene, thereby reducing ABA levels under normal growth conditions. Thus, plants adjust secondary cell wall thickening and growth via SND1. SND1 has a dual function: it activates the Myb46 pathway, fostering lignin biosynthesis to produce sufficient cell wall components for growth, while maintaining a low ABA concentration, as it inhibits growth. This dual function of SND1 may help plants modulate their growth efficiently.

Dual role of SND1 facilitates efficient communication between abiotic stress signalling and normal growth in Arabidopsis