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JXB Advance Access published online on January 6, 2009
Journal of Experimental Botany, doi:10.1093/jxb/ern323
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© 2009 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Architectural phenotypes in the transparent testa mutants of Arabidopsis thaliana

Charles S. Buer* and Michael A. Djordjevic

Genomic Interactions Group, Australian Research Council Centre of Excellence for Integrative Legume Research, School of Science, College of Medicine, Biology, and Environment, The Australian National University, PO Box 475, Canberra ACT 2601, Australia

* To whom correspondence should be addressed: E-mail: charles.buer{at}anu.edu.au

Flavonoids are low molecular weight secondary plant metabolites with a myriad of functions. As flavonoids affect auxin transport (an important growth-controlling hormone) and are biologically active in eukaryotes, flavonoid mutants were expected to have undescribed architectural phenotypes. The Arabidopsis thaliana transparent testa (tt) mutants are compromised in the enzymatic steps or transcriptional regulators affecting flavonoid synthesis. tt mutant seedlings were grown on hard-slanted agar (a stress condition), under varying light conditions, and in soil to examine the resulting growth patterns. These tt mutants revealed a wide variety of architectural phenotypes in root and aerial tissues. Mutants with increased inflorescences, siliques, and lateral root density or reduced stature are traits that could affect plant yield or performance under certain environmental conditions. The regulatory genes affected in architectural traits may provide useful molecular targets for examination in other plants.

Key words: Aglycone, Arabidopsis, auxin, ethylene, flavonoid, plant architecture

Received 7 July 2008; Revised 17 November 2008 Accepted 19 November 2008


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