Annals of Botany

Control of adventitious rooting and xylogenesis in arabidopsis

A study of Arabidopsis transcription factors finds that AR-formation and xylogenesis are inversely related but involve fine-tuning by the same proteins.
Control of adventitious rooting and xylogenesis in arabidopsis
Control of adventitious rooting and xylogenesis in arabidopsis

The Arabidopsis thaliana transcription factors SHORT ROOT (SHR) and SCARECROW (SCR) affect primary/lateral root development, as do the auxin-influx carriers LAX3 and AUX1. Della Rovere et al. study their involvement in adventitious root (AR) formation and xylogenesis using null-mutant seedlings grown with or without auxin-plus-cytokinin. They find that AR-formation and xylogenesis are developmental programmes that are inversely related, but which involve fine-tuning by the same proteins, namely SHR, SCR and AUX1. Pericycle activity is central for the equilibrium between xylary development and AR-formation in the hypocotyl, with a role for AUX1 in switching between, and balancing of, the two developmental programmes.

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