Journal Article

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 and Hirofumi Uchimiya

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 12, pages 1678-1682
Published in print December 2006 | ISSN: 0032-0781
Published online December 2006 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pcl029
Chloroplast NAD Kinase is Essential for Energy Transduction Through the Xanthophyll Cycle in Photosynthesis

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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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.

Keywords: Arabidopsis thaliana; Energy dissipation; NAD kinase; PSII; Xanthophyll cycle

Journal Article.  2304 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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