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Plant and Cell Physiology Advance Access originally published online on February 15, 2007
Plant and Cell Physiology 2007 48(3):540-549; doi:10.1093/pcp/pcm024
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Characterization of OsPID, the Rice Ortholog of PINOID, and its Possible Involvement in the Control of Polar Auxin Transport

Yutaka Morita and Junko Kyozuka*

Graduate School of Agriculture and Life Sciences, University of Tokyo, Yayoi, Bunkyo, Tokyo, 113-0032 Japan

*Corresponding author: E-mail: akyozuka{at}mail.ecc.u-tokyo.ac.jp; Fax, +81 3-5841-5087.


  Abstract

PINOID, a serine threonine protein kinase in Arabidopsis, controls auxin distribution through a positive control of subcellular localization of PIN auxin efflux carriers. Compared with the rapid progress in understanding mechanisms of auxin action in dicot species, little is known about auxin action in monocot species. Here, we describe the identification and characterization of OsPID, the PINOID ortholog of rice. Phylogenetic analysis showed that the rice genome contains a single PID ortholog, OsPID. Constitutive overexpression of OsPID caused a variety of abnormalities, such as delay of adventitious root development, curled growth of shoots and agravitropism. Abnormalities observed in the plants that overexpress OsPID could be phenocopied by treatment with an inhibitor of active polar transport of auxin, indicating that OsPID could be involved in the control of polar auxin transport in rice. Analysis of OsPID mRNA distribution showed a complex pattern in shoot meristems, indicating that it probably plays a role in the pattern formation and organogenesis in the rice shoot.

Keywords: Auxin - Crown root - Polar auxin transport - PINOID - Rice - SAM

Abbreviations: AuxRE, auxin-responsive element; CHX, cycloheximide; NPA, N-1-naphthylphthalamic acid; RT–PCR, reverse transcription–PCR; SAM, shoot apical meristem.

(Received January 7, 2007; Accepted February 5, 2007)
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