Differential expression of antenna and core genes in Prochlorococcus PCC 9511 (Oxyphotobacteria) grown under a modulated light-dark cycle

Environmental Microbiology
Laurence GarczarekW R Hess

Abstract

The continuous changes in incident solar light occurring during the day oblige oxyphototrophs, such as the marine prokaryote Prochlorococcus, to modulate the synthesis and degradation rates of their photosynthetic components finely. How this natural phenomenon influences the diel expression of photosynthetic genes has never been studied in this ecologically important oxyphotobacterium. Here, the high light-adapted strain Prochlorococcus sp. PCC 9511 was grown in large-volume continuous culture under a modulated 12 h-12 h light-dark cycle mimicking the conditions found in the upper layer of equatorial oceans. The pcbA gene encoding the major light-harvesting complex showed strong diel variations in transcript levels with two maxima, one before the onset of illumination and the other near the end of the photoperiod. In contrast, the mRNA level of psbA (encoding the reaction centre II subunit D1), the monocistronic transcript of psbD (encoding D2) and the dicistronic transcript of psbDC were all tightly correlated with light irradiance, with a minimum at night and a maximum at noon. The occurrence of a second peak during the dark period for the monocistronic transcript of psbC (encoding one of the PS II core Chl a antenna proteins...Continue Reading

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Citations

Sep 28, 2007·Archives of Microbiology·Fei CaiGordon C Cannon
Dec 4, 2002·Environmental Microbiology·Julia HoltzendorffWolfgang R Hess
Jul 21, 2007·Gene·Ilka M AxmannWolfgang R Hess
Jan 7, 2014·Marine Genomics·Ilka M AxmannAnnegret Wilde
Aug 26, 2014·Annual Review of Marine Science·Kimberly H Halsey, Bethan M Jones
Aug 6, 2015·PloS One·María-Carmen Fernández-PinosBenjamin Piña
Aug 16, 2017·Scientific Reports·Maria-Carmen Fernández-PinosJordi Dachs
Sep 26, 2019·Frontiers in Microbiology·Emily J DavenportRobert Michael L McKay
May 25, 2021·Frontiers in Microbiology·Marine LandaJonathan P Zehr

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