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In the plant cell cycle, a group of genes with mitotic functions is transcribed specifically during G2 and M phases. Such G2/M-specific genes are regulated by a common mechanism involving a cis-acting element called mitosisspecific activator (MSA) and R1R2R3-class Myb transcription factors that bind to the element. We have previously shown that a group of structurally related R1R2R3-Myb proteins acts as transcriptional activators, which include NtmybA1 and NtmybA2 from tobacco and MYB3R1 and MYB3R4 from Arabidopsis thaliana. Loss-of-function mutations in MYB3R1 and MYB3R4 showed reduced shoot elongation and significant impairment in cytokinesis during somatic cell division in A. thaliana. However, it remained unclear if this type of Myb transcription factors also have equivalent developmental roles in evolutionarily distant species. Here, we showed virus-induced silencing of both NtmybA1 and NtmybA2 causes similar defects in cytokinesis and severely dwarfed phenotype. Our results showed that a group of evolutionarily conserved R1R2R3-Myb transcriptional activators has common physiological functions in the promotion of cytokinesis and shoot elongation in different plant species.

Virus-induced silencing of NtmybA1 and NtmybA2 causes incomplete cytokinesis and reduced shoot elongation in Nicotiana benthamiana