Diel regulation of photosynthetic activity in the oceanic unicellular diazotrophic cyanobacterium Crocosphaera watsonii WH8501

Environmental Microbiology
Takako MasudaOndrej Prášil

Abstract

The oceanic unicellular diazotrophic cyanobacterium Crocosphaera watsonii WH8501 exhibits large diel changes in abundance of both Photosystem II (PSII) and Photosystem I (PSI). To understand the mechanisms underlying these dynamics, we assessed photosynthetic parameters, photosystem abundance and composition, and chlorophyll-protein biosynthesis over a diel cycle. Our data show that the decline in PSII activity and abundance observed during the dark period was related to a light-induced modification of PSII, which, in combination with the suppressed synthesis of membrane proteins, resulted in monomerization and gradual disassembly of a large portion of PSII core complexes. In the remaining population of assembled PSII monomeric complexes, we detected the non-functional version of the D1 protein, rD1, which was absent in PSII during the light phase. During the dark period, we also observed a significant decoupling of phycobilisomes from PSII and a decline in the chlorophyll a quota, which matched the complete loss of functional PSIIs and a substantial decrease in PSI abundance. However, the remaining PSI complexes maintained their photochemical activity. Thus, during the nocturnal period of nitrogen fixation C. watsonii operates...Continue Reading

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Citations

Mar 15, 2020·Nature Plants·Joko P TrinugrohoPeter J Nixon
Oct 26, 2018·Photosynthesis Research·Cosmin Ionel SicoraOana Sicora
Sep 26, 2019·Frontiers in Microbiology·Emily J DavenportRobert Michael L McKay
Jun 20, 2020·Photosynthesis Research·Kevin J SheridanTina C Summerfield
Dec 19, 2020·Computational and Structural Biotechnology Journal·Keisuke InomuraMichael J Follows
Apr 27, 2021·Frontiers in Microbiology·Sophie RabouilleOndřej Prášil

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