the model strains Prochlorococcus marinus PCC 9511 and Synechococcus sp. WH7803
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Prochlorococcus marinus PCC 9511
Candidate: toolkit item1 source documents5 linked claims
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Synechococcus sp. WH7803 appears to have developed more efficient mechanisms to cope with light and UV stress, whereas Prochlorococcus marinus PCC 9511 appears to survive stressful daytime periods by deploying a minimal set of protection mechanisms and temporarily reducing key metabolic processes.
Quoted textsource-backed
Altogether our results suggest that while Synechococcus has developed efficient ways to cope with light and UV stress, Prochlorococcus cells seemingly survive stressful hours of the day by launching a minimal set of protection mechanisms and by temporarily bringing down several key metabolic processes.
Prochlorococcus marinus PCC 9511 was more sensitive than Synechococcus sp. WH7803 to oxidative stress induced by hydrogen peroxide.
Quoted textsource-backed
Additionally, Prochlorococcus was more sensitive than Synechococcus to oxidative stress, as shown by the different degrees of PSII photoinactivation after addition of hydrogen peroxide.
In the presence of UV, the PSII repair rate at noon was significantly more depressed in Prochlorococcus marinus PCC 9511 than in Synechococcus sp. WH7803.
Quoted textsource-backed
In the presence of UV, the PSII repair rate was significantly depressed at noon in Prochlorococcus compared to Synechococcus.
Prochlorococcus marinus PCC 9511 exhibited higher sensitivity to photoinactivation than Synechococcus sp. WH7803 under high visible light with or without UV.
Quoted textsource-backed
Prochlorococcus exhibited a higher sensitivity to photoinactivation than Synechococcus under both conditions
Transcriptional analysis revealed major differences between Prochlorococcus marinus PCC 9511 and Synechococcus sp. WH7803 in diel expression patterns of genes involved in photosystem biosynthesis or repair, light-harvesting complexes, CO2 fixation, and protection against light, UV, and oxidative stress.
Quoted textsource-backed
A transcriptional analysis also revealed dramatic discrepancies between the two organisms in the diel expression patterns of several genes involved notably in the biosynthesis and/or repair of photosystems, light-harvesting complexes, CO(2) fixation as well as protection mechanisms against light, UV, and oxidative stress