Journal Article

Elevated Expression of PGR5 and NDH-H in Bundle Sheath Chloroplasts in C<sub>4</sub> <i>Flaveria</i> Species

Yuri Nakajima Munekage, Françoise Eymery, Dominique Rumeau, Stephan Cuiné, Masateru Oguri, Naoya Nakamura, Akiho Yokota, Bernard Genty and Gilles Peltier

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 51, issue 4, pages 664-668
Published in print April 2010 | ISSN: 0032-0781
Published online April 2010 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcq030
Elevated Expression of PGR5 and NDH-H in Bundle Sheath Chloroplasts in C4 Flaveria Species

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  • Biochemistry
  • Molecular and Cell Biology
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Cyclic electron transport around PSI has been proposed to supply the additional ATP required for C4 photosynthesis. To investigate the nature of cyclic electron pathways involved in C4 photosynthesis, we analyzed tissue-specific expression of PGR5 (PROTON GRADIENT REGULATION 5), which is involved in the antimycin A-sensitive pathway, and NDH-H, a subunit of the plastidial NAD(P)H dehydrogenase complex, in four Flaveria species comprising NADP-malic enzyme (ME)-type C4, C3–C4 intermediate and C3 species. PGR5 was highly expressed in the C4 species and enriched in bundle sheath chloroplasts together with NDH-H, suggesting that electron transport of both PGR5-dependent and NDH-dependent cyclic pathways is promoted to drive C4 photosynthesis.

Keywords: C4 photosynthesis; Cyclic electron transport; Flaveria

Journal Article.  2840 words.  Illustrated.

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

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