The Arabidopsis short-chain dehydrogenase/reductase 3, an ABSCISIC ACID DEFICIENT 2 homolog, is involved in plant defense responses but not in ABA biosynthesis
Journal
Plant Physiology and Biochemistry
Journal Volume
51
Journal Volume
51
Pages
63-73
Start Page
63
End Page
73
ISSN
09819428
Date Issued
2012-02
Author(s)
Hwang, San-Gwang
Hsiao, Yi-Yun
Kuo, Ching-Hsuan
Chang, Pi-Fang
Deng, Wen-Ling
Chiang, Ming-Hau
Shen, Hwei-Ling
Cheng, Wan-Hsing
Abstract
ABSCISIC ACID DEFICIENT2 (ABA2) encodes a short-chain dehydrogenase/reductase1 (SDR1) that catalyzes the multi-step conversion of xanthoxin to abscisic aldehyde during abscisic acid (ABA) biosynthesis in Arabidopsis thaliana. In this study, AtSDR2 and AtSDR3, the two closest homologs to AtABA2, were investigated for their potential role in ABA biosynthesis. AtSDR2 showed undetectable transcription in plants grown under normal conditions or under stress. AtSDR3 and AtABA2 have different spatial and temporal expression patterns. Complementation testing demonstrated that the pABA2::. SDR3 transgene failed to complement the aba2 mutant phenotype, and that transgenic plants showed the same levels of ABA as the aba2 mutants. These data suggest that AtSDR3 confers no functional redundancy to AtABA2 in ABA biosynthesis. Interestingly, microarray data derived from Genevestigator suggested that AtSDR3 might have a function that is related to plant defense. Pseudomonas syringae pv. tomato (Pst) DC3000 infection and systemic acquired resistance (SAR) activator application further demonstrated that AtSDR3 plays an important role in plant defense responses at least partially through the regulation of AtPR-1 gene expression.
Subjects
Abscisic acid
Glucose insensitive
Pathogenesis-related
Pseudomonas syringae pv. tomato DC3000
Short-chain dehydrogenase/reductase
Systemic acquired resistance
Publisher
Elsevier Masson SAS
Type
journal article