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Science 6 January 2006:
Vol. 311. no. 5757, pp. 94 - 98
DOI: 10.1126/science.1118875
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Reports

Cytokinin Signaling and Its Inhibitor AHP6 Regulate Cell Fate During Vascular Development

Ari Pekka Mähönen,1 Anthony Bishopp,1* Masayuki Higuchi,2* Kaisa M. Nieminen,1 Kaori Kinoshita,2 Kirsi Törmäkangas,1 Yoshihisa Ikeda,3 Atsuhiro Oka,4 Tatsuo Kakimoto,2{dagger} Ykä Helariutta1,5,6{dagger}

The cell lineages that form the transporting tissues (xylem and phloem) and the intervening pluripotent procambial tissue originate from stem cells near the root tip. We demonstrate that in Arabidopsis, cytokinin phytohormones negatively regulate protoxylem specification. AHP6, an inhibitory pseudophosphotransfer protein, counteracts cytokinin signaling, allowing protoxylem formation. Conversely, cytokinin signaling negatively regulates the spatial domain of AHP6 expression. Thus, by controlling the identity of cell lineages, the reciprocal interaction of cytokinin signaling and its spatially specific modulator regulates proliferation and differentiation of cell lineages during vascular development, demonstrating a previously unrecognized regulatory circuit underlying meristem organization.

1 Plant Molecular Biology Laboratory, Institute of Biotechnology, POB 56, FI-00014, University of Helsinki, Finland.
2 Department of Biology, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
3 Laboratory of Plant Molecular Biology, Rockefeller University, New York, NY 10021, USA.
4 Laboratory of Molecular Biology, Institute for Chemical Research, Kyoto University, Uji 611-0011, Japan.
5 Department of Biology, FI-20014, University of Turku, Finland.
6 Umeå Plant Science Center, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83, Umeå, Sweden.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: kakimoto{at}bio.sci.osaka-u.ac.jp (T.K.); yhelariu{at}operoni.helsinki.fi (Y.H.)

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