Tryptophan-dependent auxin biosynthesis is required for HD-ZIP III-mediated xylem patterning.

ABSTRACT: The development and growth of higher plants is highly dependent on the conduction of water and minerals throughout the plant by xylem vessels. In Arabidopsis roots the xylem is organized as an axis of cell files with two distinct cell fates: the central metaxylem and the peripheral protoxylem. During vascular development, high and low expression levels of the class III HD-ZIP transcription factors promote metaxylem and protoxylem identities, respectively. Protoxylem specification is determined by both mobile, ground tissue-emanating miRNA165/6 species, which downregulate, and auxin concentrated by polar transport, which promotes HD-ZIP III expression. However, the factors promoting high HD-ZIP III expression for metaxylem identity have remained elusive. We show here that auxin biosynthesis

SUBMITTER: Ursache R 

PROVIDER: S-EPMC7055496 | biostudies-literature | 2014 Mar

REPOSITORIES: biostudies-literature