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Plant and Cell Physiology Advance Access published online on January 19, 2009
Plant and Cell Physiology, doi:10.1093/pcp/pcp006
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

BARREN INFLORESCENCE2 interaction with ZmPIN1a suggests a role in auxin transport during maize inflorescence development

Andrea Skirpan1, Angela Hendrickson Culler2,4, Andrea Gallavotti3,5, David Jackson3, Jerry D. Cohen2 and Paula McSteen1

1Department of Biology, The Pennsylvania State University, 208 Mueller Lab, University Park, PA 16802.
2Department of Horticultural Science, University of Minnesota, 252 Alderman Hall, 1970 Folwell Avenue, St. Paul, MN 55108.
3Cold Spring Harbor Laboratory, 1 Bungtown Rd, Cold Spring Harbor, NY 11724.

Corresponding author: Paula McSteen, Department of Biology, The Pennsylvania State University, 208 Mueller Lab, University Park, Pennsylvania 16802 USA Phone: 814-863-1112 Fax: 814-865-9131 E-mail: pcm11{at}psu.edu


  Abstract

Polar auxin transport, mediated by the PIN-FORMED (PIN) class of auxin efflux carriers, controls organ initiation in plants. In maize, BARREN INFLORESCENCE2 (BIF2) encodes a serine/threonine protein kinase co-orthologous to PINOID (PID), which regulates the subcellular localization of AtPIN1 in Arabidopsis. We show that BIF2 phosphorylates ZmPIN1a, a maize homolog of AtPIN1, in vitro and regulates ZmPIN1a subcellular localization in vivo similar to the role of PID in Arabidopsis. In addition, bif2 mutant inflorescences have lower auxin levels later in development. We propose that BIF2 regulates auxin transport through direct regulation of ZmPIN1a during maize inflorescence development.

Keywords: auxin transport - barren inflorescence2 - maize - PINOID - PIN-FORMED

4Present address: Monsanto Company, 800 N. Lindbergh Blvd., Saint Louis, MO 63167.

5Present address: Section of Cell and Developmental Biology, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093.

(Received October 24, 2008; Accepted January 8, 2009)
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