Encyclopedia of Life Sciences 2010
DOI: 10.1002/9780470015902.a0000306.pub2
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Cyanobacterial Heterocysts

Abstract: Cyanobacteria are phototrophic bacteria carrying out oxygen‐producing photosynthesis. Indeed, cyanobacteria were the inventors of oxygenic photosynthesis carried out by eukaryotic algae and plants. Besides showing the capability of building their cellular carbon from carbon dioxide, available in the atmosphere, several strains of cyanobacteria have also acquired the ability to fix molecular dinitrogen (N 2 ). As the enzyme responsible for nitrogen fixation ( nitrogenas… Show more

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Cited by 20 publications
(16 citation statements)
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“…S10). PSI fluorescence inside the heterocysts often showed a gradient parallel to the filament axis, as reported previously from an electron microscopy study (Maldener and Muro-Pastor, 2010). The intercalary heterocysts often showed bright PSI fluorescence peaks near their connections to adjacent vegetative cells, while their central regions were relatively dark.…”
Section: Intracellular Distribution Of Thylakoid Membranes In the Hetsupporting
confidence: 83%
See 1 more Smart Citation
“…S10). PSI fluorescence inside the heterocysts often showed a gradient parallel to the filament axis, as reported previously from an electron microscopy study (Maldener and Muro-Pastor, 2010). The intercalary heterocysts often showed bright PSI fluorescence peaks near their connections to adjacent vegetative cells, while their central regions were relatively dark.…”
Section: Intracellular Distribution Of Thylakoid Membranes In the Hetsupporting
confidence: 83%
“…Many studies have examined the timing and spatial patterns of gene expression after the onset of nitrogen deprivation in heterocyst-forming cyanobacteria (Flores and Herrero, 2010;Kumar et al, 2010;Maldener and Muro-Pastor, 2010;Christman et al, 2011;Flaherty et al, 2011). For example, heterocyst differentiation was critically controlled by two regulator proteins, HetR and NtcA, and their encoding genes were strongly expressed in certain spatially separated cells that ultimately became heterocysts (Black et al, 1993;Olmedo-Verd et al, 2006).…”
Section: Discussion Different Dynamic Changes Of Pbs Subunits and Psimentioning
confidence: 99%
“…Filamentous heterocyst‐forming cyanobacteria are capable of aerobic nitrogen fixation because the oxygen‐sensitive nitrogenase is expressed only in specialized micro‐oxic cells called heterocysts that differentiate in filaments in response to nitrogen deprivation (reviewed: Thiel, ; Flores and Herrero, ; Maldener and Muro‐Pastor, ). The strain Anabaena variabilis ATCC 29413 is unusual among the well‐studied cyanobacteria in that it has an alternative V‐nitrogenase that functions in heterocysts under conditions of both nitrogen and molybdate limitation, when the Mo‐nitrogenase is non‐functional (Thiel, ).…”
Section: Introductionmentioning
confidence: 99%
“…The cells that differentiate do not occur randomly in the filament, and differentiation of adjacent cells into heterocysts is relatively uncommon. The differentiation of a heterocyst depends on a regulatory cascade that not only directs the development of a vegetative cell into a heterocyst, but is also important for the establishment and maintenance of heterocysts in a semiregular pattern in the filaments (3)(4)(5). The spacing of heterocysts ensures that all cells in the filament maintain a constant supply of both fixed nitrogen and fixed carbon.…”
mentioning
confidence: 99%