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- W1762895268 abstract "Nostocacean cyanobacteria typically produce gliding filaments termed hormogonia at a low frequency as part of their life cycle. We report here that all Nostoc spp. competent in establishing a symbiotic association with the hornwort Anthoceros punctatus formed hormogonial filaments at a high frequency in the presence of A. punctatus . The hormogonia-inducing activity was produced by A. punctatus under nitrogen-limited culture conditions. The hormogonia of the symbiotically competent Nostoc spp. were characterized as motile (gliding) filaments lacking heterocysts and with distinctly smaller cells than those of vegetative filaments; the small cells resulted from a continuation of cell division uncoupled from biomass increase. An essentially complete conversion of vegetative filaments to hormogonia occurred within 12 h of exposure of Nostoc sp. strain 7801 to A. punctatus growth-conditioned medium. Hormogonia formation was accompanied by loss of nitrogen fixation (acetylene reduction) and by decreases in photosynthetic CO 2 fixation and in vivo NH 4 + assimilation of 30% and approximately 40%, respectively. The rates of acetylene reduction and CO 2 fixation returned to approximately the control rates within 72 to 96 h after hormogonia induction, as the cultures of Nostoc sp. strain 7801 differentiated heterocysts and reverted to the vegetative growth state. The relationship between hormogonia formation and symbiotic competence is discussed." @default.
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- W1762895268 date "1989-01-01" @default.
- W1762895268 modified "2023-09-29" @default.
- W1762895268 title "Characteristics of Hormogonia Formation by Symbiotic <i>Nostoc</i> spp. in Response to the Presence of <i>Anthoceros punctatus</i> or Its Extracellular Products" @default.
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- W1762895268 doi "https://doi.org/10.1128/aem.55.1.125-131.1989" @default.
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