LONESOME HIGHWAY-TARGET OF MONOPTEROS5 transcription factor complex promotes a predifferentiation state for xylem vessel differentiation in the root apical meristem by inducing the expression of VASCULAR-RELATED NAC-DOMAIN genes.
Study revealed the evolutionary trajectory for the heterodimeric TMO5/LHW transcription factor complex which is rate-limiting for vascular cell proliferation in Arabidopsis thaliana. Both regulators have origins predating vascular tissue emergence and even terrestrialization. TMO5 evolved its modern function including dimerization with LHW at the origin of land plants.
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