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Science 30 May 2003:
Vol. 300. no. 5624, pp. 1427 - 1430
DOI: 10.1126/science.1083695
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Reports

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

Yohei Ohashi,1 Atsuhiro Oka,1 Renato Rodrigues-Pousada,2 Marco Possenti,2 Ida Ruberti,3 Giorgio Morelli,2 Takashi Aoyama1*

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 D{zeta}1 gene (AtPLD{zeta}1) was identified as a direct target of GL2. Inducible expression of AtPLD{zeta}1 promoted ectopic root-hair initiation. We conclude that GL2 exerts its regulatory effect on root-hair development through modulation of phospholipid signaling.

1 Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
2 Istituto Nazionale di Ricerca per gli Alimenti e la Nutrizione, Via Ardeatina 546, 00178 Rome, Italy.
3 Centro di studio per gli Acidi Nucleici, c/o Dipartimento di Genetica e Biologia Molecolare, Università di Roma La Sapienza, Piazzale Aldo Moro 5, 00185 Rome, Italy.

* To whom correspondence should be addressed. E-mail: aoyama{at}scl.kyoto-u.ac.jp

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Science. ISSN 0036-8075 (print), 1095-9203 (online)