Chloroplast NAD kinase is essential for energy transduction through the xanthophyll cycle in photosynthesis

Hideyuki Takahashi*, Ayako Watanabe, Ayumi Tanaka, Shin Nosuke Hashida, Maki Kawai-Yamada, Kintake Sonoike, Hirofumi Uchimiya

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)


Photosynthetic parameters of the nadk2 mutant of Arabidopsis thaliana, which is defective in chloroplast NAD kinase, were investigated. In this plant, the effective efficiency of photosynthetic electron transport (ΦII) and the quantum yield of open reaction centers of photosystem II (Fv′/Fm′) were decreased. Furthermore, an increase in non-photochemical quenching attributed to energy dissipation from the xanthophyll cycle was observed. The mutant showed an aberrant de-epoxidation state of xanthophyll cycle carotenoids and had a high level of zeaxanthin even under low light conditions. These results indicate that chloroplast NAD kinase, catalyzing phosphorylation of NAD, is essential for the proper photosynthetic machinery of PSII and the xanthophyll cycle.

Original languageEnglish
Pages (from-to)1678-1682
Number of pages5
JournalPlant and Cell Physiology
Issue number12
Publication statusPublished - 2006 Dec
Externally publishedYes


  • Arabidopsis thaliana
  • Energy dissipation
  • NAD kinase
  • PSII
  • Xanthophyll cycle

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology


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