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Photosynthetica

, Volume 48, Issue 1, pp 16–22 | Cite as

Light-independent accumulation of essential chlorophyll biosynthesis- and photosynthesis-related proteins in Pinus mugo and Pinus sylvestris seedlings

  • K. BreznenováEmail author
  • V. Demko
  • A. Pavlovič
  • E. Gálová
  • R. Balážová
  • J. Hudák
Original Papers

Abstract

Dark-grown seedlings of Pinus mugo Turra and Pinus sylvestris L. accumulate chlorophyll (Chl) and its precursor protochlorophyllide (Pchlide). Pchlide reduction is a key regulatory step in Chl biosynthesis. In the dark, Pchlide is reduced by light-independent Pchlide oxidoreductase (DPOR) encoded by three plastid genes chlL, chlN, and chlB (chlLNB). To investigate the differences in chlLNB gene expressions, we compared the dark-grown and 24-h illuminated seedlings of P. mugo and P. sylvestris. Expression of these genes was found constitutive in all analyzed samples. We report light-independent accumulation of important proteins involved in Chl biosynthesis (glutamyl-tRNA reductase) and photosystem formation (D1 and LHCI). Chl and Pchlide content and plastid ultrastructure studies were also performed.

Additional key words

chlorophyll biosynthesis conifer seedlings plastid gene expression plastid ultrastructure protochlorophyllide reduction 

Abbreviations

ALA

5-aminolevulinic acid

Chl

chlorophyll

Chlide

chlorophyllide

chlLNB

chlL, chlN, and chlB genes

cpDNA

plastid DNA

DPOR

light-independent protochlorophyllide oxidoreductase

GluTR

glutamyl-tRNA reductase

LHC

light-harvesting complex

LPOR

light-dependent protochlorophyllide oxidoreductase

Pchlide

protochlorophyllide

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Notes

Acknowledgements

This research work was supported by the grant from the Slovak Research and Development Agency (APVV-20-020805). We thank Y. Fujita and B. Grimm for kindly providing the primary antibodies used in this work and Jarmila Šramková for excellent technical assistance.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • K. Breznenová
    • 1
    Email author
  • V. Demko
    • 1
  • A. Pavlovič
    • 1
  • E. Gálová
    • 2
  • R. Balážová
    • 1
  • J. Hudák
    • 1
  1. 1.Department of Plant Physiology, Faculty of Natural SciencesComenius UniversityBratislavaSlovak Republic
  2. 2.Department of Genetics, Faculty of Natural SciencesComenius UniversityBratislavaSlovak Republic

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