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Significance Wood is a widely used renewable feedstock for industrial production and energy generation. The secondary cell wall (SCW) is the major component of wood. Two key transcription factor families, Vascular-Related NAC-Domain (VND) and Secondary Wall-Associated NAC Domain (SND), are master gene regulators for SCW biosynthesis. However, plants exhibit stunted growth or abnormal SCW development under excess VND or SND gene expression. In this study, we show that two splice variants, PtrVND6-C1IR and PtrSND1-A2IR , each from VND and SND families, act as negative regulators. We propose that PtrVND6-C1IR and PtrSND1-A2IR function together for reciprocal cross-regulation of VND and SND families to maintain homeostasis for xylem differentiation and plant development.

Reciprocal cross-regulation of VND and SND multigene TF families for wood formation in Populus trichocarpa