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Published on September 22, 2006; 10.1104/pp.106.085191

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Received June 15, 2006
Accepted September 15, 2006

The Arabidopsis Tetratricopeptide Repeats Containing Protein TTL1 Is Required for Osmotic Stress Responses and ABA Sensitivity

Abel Rosado , Arnaldo L. Schapire , Ray A. Bressan , Antoine L. Harfouche , Paul M. Hasegawa , Victoriano Valpuesta , and Miguel A. Botella *

Departamento de Biología Molecular y Bioquímica Universidad de Málaga, 29010 Málaga, Spain
Center for Plant Environmental Stress Physiology Purdue University, West Lafayette, Indiana 47907-2010, USA

* Corresponding author; email: mabotella{at}uma.es.

Mutations in the Arabidopsis thaliana TTL1 (Tetratricopetide-repeat Thioredoxin-Like 1) cause reduced tolerance to NaCl and osmotic stress that is characterized by reduced root elongation, disorganization of the root meristem and impaired osmotic responses during germination and seedling development. Expression analyses of genes involved in ABA biosynthesis and catabolism suggest that TTL1 is not involved in the regulation of ABA levels, but is required for ABA regulated responses. TTL1 regulates the transcript levels of several dehydration responsive genes such as the transcription factor DREB2A, and genes encoding dehydration response proteins such as ERD1, ERD3 and COR15a. The TTL1 gene encodes a novel plant protein with tetratricopeptide repeats (TPR) and a region with homology to thioredoxin proteins. Based on homology searches there are 4 TTL members in the Arabidopsis genome with similar intron-exon structure and conserved amino acid domains. Proteins containing TPR motifs act as scaffold forming multiprotein complexes and are emerging as essential elements for plant hormonal responses such as gibberellins and ethylene. In this report, we identify TTL1 as a positive regulator of the ABA signaling during germination and seedling development under stress.




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