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Plant and Cell Physiology Advance Access originally published online on January 19, 2009
Plant and Cell Physiology 2009 50(3):652-657; 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 email: journals.permissions@oxfordjournals.org

Short Communication

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, USA
2Department of Horticultural Science, University of Minnesota, 252 Alderman Hall, 1970 Folwell Avenue, St Paul, MN 55108, USA
3Cold Spring Harbor Laboratory, 1 Bungtown Rd, Cold Spring Harbor, NY 11724, USA

*Corresponding author: E-mail, pcm11{at}psu.edu; Fax, +1-814-865-9131.


  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.

Abbreviations: BM, branch meristem; FM, floral meristem; GST, glutathione S-transferase; IM, inflorescence mer-istem; SEM, scanning electron microscopy; SM, spikelet meristem; SPM, spikelet pair meristem; YFP, yellow fluorescent protein.

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

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

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