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Genetic Analysis of Heterocyst Formation
1999Fogg’s observation (1) that heterocyst differentiation is regulated by the availability of fixed nitrogen has been abundantly confirmed (references in 2; see, however, 3,4). Fig. 1 summarizes what has been learned about transcriptional dependencies during the early stages of heterocyst formation. In Anabaena sp. strain PCC 7120, nirAand narBencode NO2 -
C. Peter Wolk, Jinsong Zhu, Renqui Kong
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Gene Expression during Heterocyst Differentiation
2013Abstract Some cyanobacteria (oxygenic phototrophs) grow as chains of vegetative cells (filaments or trichomes). When placed in media lacking combined nitrogen, some cells in the filaments differentiate into N2-fixing heterocysts. The nitrogen fixation system is inactivated by oxygen, and the heterocyst provides a micro-oxic environment for ...
Antonia Herrero +2 more
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Heterocyst Development and Pattern Formation
2014Most of the information about heterocyst development to date is based on the study of three species of heterocyst-forming filamentous cyanobacteria: Anabaena (also Nostoc) sp. strain PCC 7120, A. variabilis ATCC 29413, and Nostoc punctiforme ATCC 29133. This chapter focuses on those genes involved in signaling and regulation.
M. Ramona Aldea +2 more
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Heterocyst Germination under Defined Conditions
Nature, 1965ONLY on rare occasions have heterocysts of blue-green algae been seen to germinate. The observations of a number of investigators have supported various suggestions as to non-reproductive functions of these cells. However, no definitive elucidation of their function has yet been presented1.
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Heterocyst Differentiation in Anabaena ambigua
Biochemie und Physiologie der Pflanzen, 1976Summary The undifferentiated algal filaments of Anabaena ambigua Rao were exposed to N-methyl-N'-nitro-N-nitrosoguanidine (NTG), and UV-irradiation during the induction period of heterocyst formation. NTG has been observed to inhibit the heterocyst differentiation by affecting the enzyme level.
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THE HETEROCYSTS OF BLUE‐GREEN ALGAE (MYXOPHYCEAE)
Biological Reviews, 1975Summary1. Heterocysts are found in many species of filamentous blue‐green algae. They are cells of slightly larger size and with a more thickened wall than the vegetative cells.2. Structural details of the heterocyst are: the presence of three additional wall layers, the absence of granules, sparse thylakoid network throughout, except at the poles ...
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Nitrogen Fixation by Cyanobacterial Heterocysts
1981This paper details current knowledge about nitrogen fixation by cyanobacterial (blue-green algal) heterocysts. I will first review the most direct evidence that aerobic nitrogen fixation is localized in heterocysts; will then recount the results of enzymatic studies which provide examples of specializations apparently supporting this localization; and ...
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