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Plant and Cell Physiology Advance Access published online on July 24, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm094
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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 e-mail: journals.permissions@oxfordjournals.org

CRM1/BIG-mediated auxin action regulates Arabidopsis inflorescence development

Nobutoshi Yamaguchi1, Mitsuhiro Suzuki1, Hidehiro Fukaki2,3, Miyo Morita Terao2, Masao Tasaka2 and Yoshibumi Komeda1,*

1 Laboratory of Plant Science, Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
2 Graduate School of Biological Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan

Corresponding author: Nobutoshi Yamaguchi, Laboratory of Plant Science, Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. Phone: +81-3-5841-4454, Fax: +81-3-5841-4454, E-mail: komeda-y{at}biol.s.u-tokyo.ac.jp


  Abstract

The shape of the inflorescence in Arabidopsis thaliana ecotype Columbia is a raceme with individual flowers developing acropetally. The ecotype Landsberg harboring the erecta (er) mutation shows a corymb-like inflorescence, namely, a compact inflorescence with a flattened arrangement of flower buds at the tip. To gain insight into inflorescence development, we previously isolated corymb-like inflorescence mutants, named corymbosa1 (crm1) and found that the corymb-like inflorescence in crm1-1 was due to reduced cell elongation of pedicels and stem internodes. Double mutants of crm1 with er and crm2, and crm1-1 crm2-1 er-105 triple mutants show an additive phenotype. The crm1-1 is caused by a mutation in BIG, which is required for polar auxin transport. CRM1/BIG is expressed in inflorescence meristems, floral meristems and vascular tissues. We analyzed a collection of 12 reduced lateral root formation (rlr) mutants, which are allelic to crm1-1, and categorized the mutants into three classes, depending on the plant developmental defects. Although all 12 alleles had new stop codons, the phenotype of heterozygous crm1-1/doc1-1 and Northern blotting suggest that new crm1/big mutant alleles are hypomorphic. Auxin-responsive DR5rev::GFP expression was decreased in crm1-1 vasculature of pedicels and stem internodes. PINFORMED1 (PIN1) and CRM1/BIG are expressed in vasculature of pedicels and stem internodes. Severity of corymb-like inflorescence in crm1/big mutants correlated with increased levels of PIN1. Our results suggest that CRM1/BIG controls the elongation of the pedicels and stem internodes through auxin action.

Keywords: Arabidopsis thaliana-BIG - gene-Corymb-like inflorescence - corymbosa1 - Inflorescence development - Polar auxin transport

3Present address: Graduate School of Science, Kobe University, 1-1 Rokkodai, Kobe, 657-8501, Japan


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J. Exp. Bot., July 18, 2008; (2008) ern109v1.
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