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Plant and Cell Physiology Advance Access published online on November 6, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm152
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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

An ABC transporter gene of Arabidopsis thaliana, AtWBC11, is involved in cuticle development and prevention of organ fusion

Bin Luo1,2, Xue-Yi Xue1,2, Wen-Li Hu1, Ling-Jian Wang1 and Xiao-Ya Chen1

1 National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 300 Fenglin Road, Shanghai 200032, P.R. China
2 Graduate School of the Chinese Academy of Sciences, Shanghai 200032, P.R. China

Corresponding author: Dr. Xiao-Ya Chen. 300 Fenglin Road, Shanghai 200032, P.R. China, E-mail: xychen{at}sibs.ac.cn; Tel: 86-21-54924033; Fax: 86-21-54924015


  Abstract

Cuticle, including wax and cutin, is the barrier covering plant aerial organs and protecting the inner tissues. The Arabidopsis thaliana ABC transporter CER5 (AtWBC12) has been identified as a wax exporter. Agreeing with the latest report (Bird et al. 2007) of another wax exporter, AtWBC11, here we show that atwbc11 mutants displayed organ fusions and stunted growth, and became vulnerable to chlorophyll leaching and toluidine-blue staining. Chemical analysis showed that wax and cutin monomers were both reduced in the atwbc11 mutant. AtWBC11 was widely expressed in aerial organs. Interestingly, we found that the expression was light-dependent and the phytohormone ABA upregulated AtWBC11 expression. We also found that while AtWBC11 promoter had a broad pattern of activity, the expression was converted to epidermis-specific when the reporter gene was fused to AtWBC11 cDNA. Furthermore, RNA blot analysis supported epidermis-specific expression of AtWBC11. Our results support that AtWBC11 is in involved in cuticle development.

Keywords: ABC transporter - Arabidopsis thaliana - cuticle - cutin - wax

(Received October 5, 2007; Accepted October 31, 2007)
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