Mn Transport and the Assembly of Photosystem II

Salomon, Eitan; Ренгер, Г.; Keren, Nir

doi:10.1007/978-94-007-0388-9_15

Cited by 2 publications

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“…In oxygenated, aqueous environments, Fe is found mostly in its oxidized (Fe 3+ ), non‐soluble form (Brand et al ., ; Morel, ; Kranzler et al ., ). Manganese is found mostly in its soluble Mn 2+ state (Salomon et al ., ). Nevertheless, Mn 2+ can be oxidized to the non‐soluble Mn 3+ state by biological or geochemical activities (Rona, ; Pittman, ).…”

Section: Introductionmentioning

confidence: 99%

Acclimation to environmentally relevantMn concentrations rescues a cyanobacterium from the detrimental effects of iron limitation

Salomon

Keren

2015

Environmental Microbiology

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The functions of micronutrient transition metals in photosynthetic organisms are interconnected. So are the effects of their limitation. Here we present evidence for the effects of Mn limitation on Fe limitation responses in the cyanobacterium Synechocystis sp. PCC 6803. Low Mn acclimated cells were able to detect and respond to iron insufficiency by inducing specific Fe transporters. However, they did not bleach, lose additional photosystem I activity and did not induce isiA transcription. Induction of the isiAB operon is a hallmark of iron limitation, and the isiA protein is considered to be central to the acclimation of the photosynthetic apparatus. Our results suggest that acclimation to environmentally relevant Mn concentrations that much lower than those used in laboratory experiments reduces the detrimental effects of iron limitation and modifies iron stress responses.

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