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Modulation of Phospholipid Signaling by GLABRA2 in Root-Hair Pattern Formation

2003; American Association for the Advancement of Science; Volume: 300; Issue: 5624 Linguagem: Inglês

10.1126/science.1083695

1095-9203

Yohei Ohashi, Atsuhiro Oka, Renato A. Rodrigues-Pousada, Marco Possenti, Ida Ruberti, Giorgio Morelli, Takashi Aoyama,

Polysaccharides and Plant Cell Walls

The root-hair pattern of Arabidopsis is determined through a regulatory circuit composed of transcription factor genes. The homeobox gene GLABRA2 (GL2) has been considered a key component, acting farthest downstream in this regulation. GL2 modified to include a transactivating function caused epidermal cells to develop ectopic root hairs or root hair-like structures. With this system, the phospholipase Dzeta1 gene (AtPLDzeta1) was identified as a direct target of GL2. Inducible expression of AtPLDzeta1 promoted ectopic root-hair initiation. We conclude that GL2 exerts its regulatory effect on root-hair development through modulation of phospholipid signaling.