Light color regulation of photosynthetic antennae biogenesis in marine phytoplankton - Station biologique de Roscoff
Article Dans Une Revue Plant and Cell Physiology Année : 2024

Light color regulation of photosynthetic antennae biogenesis in marine phytoplankton

David M. Kehoe
Kes Lynn Joseph
  • Fonction : Auteur
Adam A. Nguyen
  • Fonction : Auteur

Résumé

ABSTRACT Photosynthesis in the world’s oceans is primarily conducted by phytoplankton, microorganisms that use many different pigments for light capture. Synechococcus is a unicellular cyanobacterium estimated to be the second most abundant marine phototroph, with a global population of 7 x 1026 cells. This group’s success is partly due to the pigment diversity in their photosynthetic light harvesting antennae, which maximize photon capture for photosynthesis. Many Synechococcus isolates adjust their antennae composition in response to shifts in the blue:green ratio of ambient light. This response was named Type 4 chromatic acclimation (CA4). Research has made significant progress in understanding CA4 across scales, from its global ecological importance to its molecular mechanisms. Two forms of CA4 exist, each correlated with the occurrence of one of two distinct but related genomic islands. Several genes in these islands are differentially transcribed by the ambient blue:green light ratio. The encoded proteins control the addition of different pigments to the antennae proteins in blue versus green light, altering their absorption characteristics to maximize photon capture. These genes are regulated by several putative transcription factors also encoded in the genomic islands. Ecologically, CA4 is the most abundant of marine Synechococcus pigment types, occurring in over 40% of the population oceanwide. It predominates at higher latitudes and at depth, suggesting that CA4 is most beneficial under sub-saturating photosynthetic light irradiances. Future CA4 research will further clarify the ecological role of CA4 and the molecular mechanisms controlling this globally important form of phenotypic plasticity.
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Dates et versions

hal-04725332 , version 1 (08-10-2024)

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David M. Kehoe, Avijit Biswas, Bo Chen, Louison Dufour, Théophile Grébert, et al.. Light color regulation of photosynthetic antennae biogenesis in marine phytoplankton. Plant and Cell Physiology, 2024, ⟨10.1093/pcp/pcae115⟩. ⟨hal-04725332⟩
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