Planta

, Volume 222, Issue 5, pp 926–932

Expression of the Apx gene family during leaf senescence of Arabidopsis thaliana

  • Irina I. Panchuk
  • Ulrike Zentgraf
  • Roman A. Volkov
Rapid Communication

Abstract

Oxygen-free radicals are thought to play an essential role in senescence. Therefore, the expression patterns of the small gene family encoding the H2O2 scavenging enzymes ascorbate peroxidase (APX; EC 1.11.1.11) were analyzed during senescence of Arabidopsis thaliana (L.) Heinh. Applying real-time RT-PCR, the mRNA levels were quantified for three cytosolic (APX1, APX2, APX6), two chloroplastic types (stromal sAPX, thylakoid tAPX), and three microsomal (APX3, APX4, APX5) isoforms identified in the genome of Arabidopsis. The genes of chloroplastic thylakoid-bound tAPX and the microsomal APX4 exhibit a strong age-related decrease of mRNA level in leaves derived from one rosette as well as in leaves derived from plants of different ages. In contrast to the tAPX, the mRNA of sAPX was only reduced in old leaves of old plants. The microsomal APX3 and APX5, and the cytosolic APX1, APX2, and APX6 did not show remarkable age-related changes in mRNA levels. The data show that expression of the individual APX genes is differentially regulated during senescence indicating possible functional specialization of respective isoenzymes. The hydrogen peroxide levels seem to be controlled very precisely in different cell compartments during plant development.

Keywords

Actin2 Arabidopsis Ascorbate peroxidase Leaf senescence Real-time RT-PCR 

Abbreviations

APX

Ascorbate peroxides

CAT

Catalase

SAG

Senescence-associated gene

SDG

Senescence-downregulated gene

ROS

Reactive oxygen species

REU

Relative expression units

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Irina I. Panchuk
    • 1
  • Ulrike Zentgraf
    • 2
  • Roman A. Volkov
    • 1
  1. 1.Department of BiochemistryNational University of ChernivtsyChernivtsyUkraine
  2. 2.ZMBP—Center of Molecular Biology of PlantsUniversity of TübingenTübingenGermany

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