Plant Molecular Biology

, Volume 64, Issue 1–2, pp 205–217

Altered ABA, proline and hydrogen peroxide in an Arabidopsis glutamate:glyoxylate aminotransferase mutant

Article

DOI: 10.1007/s11103-007-9145-z

Cite this article as:
Verslues, P.E., Kim, YS. & Zhu, JK. Plant Mol Biol (2007) 64: 205. doi:10.1007/s11103-007-9145-z

Abstract

Plant responses to abiotic stress are determined both by the severity of the stress as well as the metabolic status of the plant. Abscisic acid (ABA) is a key component in integrating these various signals and controlling downstream stress responses. By screening for plants with decreased RD29A:LUC expression, we isolated two alleles, glutamate:glyoxylate transferase1-1 (ggt1-1) and ggt1-2, of a mutant with altered ABA sensitivity. In addition to reduced ABA induction of RD29A, ggt1-1 was altered in ABA and stress regulation of Δ1-pyrroline-5-carboxylate synthase, proline dehydrogenase and 9-cis-epoxycarotenoid dioxygenase 3, which encode enzymes involved in Pro and ABA metabolsim, respectively. ggt1-1 also had altered ABA and Pro contents after stress or ABA treatments while root growth and leaf water loss were relatively unaffected. A light-dependent increase in H2O2 accumulation was observed in ggt1-1 consistent with the previously characterized role of GGT1 in photorespiration. Treatment with exogenous H2O2, as well as analysis of a mutant in nucleoside diphosphate kinase 2 which also had increased H2O2 content but is not involved in photorespiration or amino acid metabolism, demonstrated that the greater ABA stimulation of Pro accumulation in these mutants was caused by altered H2O2 content as opposed to other metabolic changes. The results suggest that metabolic changes that alter H2O2 levels can affect both ABA accumulation and ABA sensitivity.

Keywords

Abiotic stress Abscisic acid Glutamate:glyoxylate aminotransferase Hydrogen peroxide Nucleoside diphosphate kinase 2 Proline 

Abbreviations

ABA

Abscisic acid

COR15

Cold responsive 15

GGT1

Glutamate:glyoxylate transferase 1

NCED3

9-cis-Epoxycarotenoed dioxygenase 3

NDPK2

Nucleoside diphosphate kinase 2

P5CS1

Δ1-Pyrroline-5-carboxylate synthase 1

PEG

Polyethylene glycol 8000

ProDH

Proline dehydrogenase

QPCR

Quantitative real-time reverse transcriptase PCR

RAB18

Responsive to ABA18

RD29A:LUC

RD29A (responsive to dessication29A) promoter controlling expression of the luciferase coding region

ROS

Reactive oxygen species

SA

Salicylic acid

SHMT1

Serine-hydroxylmethyl transferase

Supplementary material

11103_2007_9145_MOESM1_ESM.pdf (3.5 mb)
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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Paul E. Verslues
    • 1
  • Yong-Sig Kim
    • 2
  • Jian-Kang Zhu
    • 1
  1. 1.Department of Botany and Plant Sciences, Institute for Integrative Genome BiologyUniversity of CaliforniaRiversideUSA
  2. 2.Department of Plant SciencesUniversity of ArizonaTucsonUSA

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