Current Genetics

, Volume 26, Issue 2, pp 159–165 | Cite as

Chloroplastic genomes of Ginkgo biloba and Chlamydomonas moewusii contain a chlB gene encoding one subunit of a light-independent protochlorophyllide reductase

  • Martine Richard
  • Colette Tremblay
  • Guy Bellemare
Original Articles


We have cloned and sequenced a Chlamydomonas moewusii chloroplastic DNA fragment that includes a 563 amino-acid open reading frame (ORF563, chlB) presenting 89% amino-acid homology with ORF513 from Marchantia polymorpha. It is also homologous to ORF510 from Pinus thumbergii but includes two insertions absent in both M. polymorpha and P. thunbergii. The derived polypeptide is 54% similar to the product of bchB from Rhodobacter capsulatus, identified as one subunit of a light-independent NADH-protochlorophyllide reductase. We also isolated and sequenced an homologous chloroplastic gene from the gymnosperm Ginkgo biloba. Northern hybridizations performed on RNA isolated from synchronized Chlamydomonas eugametos cells showed higher expression between the tenth hour of light and the eighth hour of darkness, peaking during the first 2 h of darkness.

Key words

Chlamydomonas chlB Ginkgo biloba Protochlorophyllide reductase 


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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • Martine Richard
    • 1
  • Colette Tremblay
    • 1
  • Guy Bellemare
    • 1
  1. 1.Département de Biochimie, Faculté des Sciences et de GénieUniversité LavalQuébecCanada

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