1972
DOI: 10.1016/0005-2728(72)90170-3
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Absence of Photosystem 2 in heterocysts of the blue-green alga Anabaena

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Cited by 110 publications
(49 citation statements)
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“…The mature heterocyst cannot divide or de-differentiate (53). It has lost photosystem II activity, but still retains photosystem I activity, and hence can perform cyclic photophosphorylation (15).…”
Section: Nitrogen Fixationmentioning
confidence: 99%
“…The mature heterocyst cannot divide or de-differentiate (53). It has lost photosystem II activity, but still retains photosystem I activity, and hence can perform cyclic photophosphorylation (15).…”
Section: Nitrogen Fixationmentioning
confidence: 99%
“…They differ from the vegetative cells in their pigment composition [2], and lack photosystem II-mediated activities [3]. However they contain P-700 and a c-type cytochrome [3] and have recently been found to carry out various photochemical reactions associated with Photosystem I [4,5] It is possible to separate and purify intact heterocysts, which retain nitrogenase activity and a modified photosynthetic apparatus.…”
Section: Introductionmentioning
confidence: 99%
“…They differ from the vegetative cells in their pigment composition [2], and lack photosystem II-mediated activities [3]. However they contain P-700 and a c-type cytochrome [3] and have recently been found to carry out various photochemical reactions associated with Photosystem I [4,5] It is possible to separate and purify intact heterocysts, which retain nitrogenase activity and a modified photosynthetic apparatus. In this paper we describe investigation of isolated heterocyst preparations from Anabaena cylindrica, using electron paramagnetic resonance (EPR) spectroscopy, which demonstrate the existence of Photosystem I components P-700 and bound iron-sulphur proteins, and provide indirect evidence for the presence of a third electron acceptor.…”
Section: Introductionmentioning
confidence: 99%
“…Constituem também importantes organismos fixadores de nitrogênio. As espécies fixadoras de nitrogênio atmosférico possuem vantagem adaptativa sobre os organismos não fixadores constituintes do fitoplâncton (DONZE et al, 1972;SOMPONG et al, 2005). Estas cianobactérias são caracterizadas por formarem células especializadas, denominadas heterócitos que se diferenciam quando há baixa concentração de compostos nitrogenados do meio (BERMAN-FRANK et al, 2007).…”
Section: Cianobactérias E Metabólitos Secundáriosunclassified
“…O nitrogênio fixado é passado para as células vegetativas na forma de compostos nitrogenados capazes de integrar o metabolismo destes organismos (CHORUS & BARTRAM, 1999). A ausência do pigmento acessório ficocianina nos heterócitos sugere que nestas células falta o fotosistema II (PSII) e por isso são incapazes de produzir O2, que tem conhecida capacidade de inibir a atividade da nitrogenase (DONZE et al, 1972). Adicionalmente, para todas cianobactérias, o principal pigmento de captação da luz solar é a clorofila-a.…”
Section: Cianobactérias E Metabólitos Secundáriosunclassified