NDLI: Nitrogen fixation by the diazotroph Cylindrospermopsis raciborskii (Cyanophyceae)

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Nitrogen fixation by the diazotroph Cylindrospermopsis raciborskii (Cyanophyceae)

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Willis, Anusuya Chuang, Ann W. Burford, Michele A.
Description	Country affiliation: Australia Author Affiliation: Willis A ( Australian Rivers Institute, Griffith University, 170 Kessels Rd, Nathan, Queensland, 4111, Australia.); Chuang AW ( Australian Rivers Institute, Griffith University, 170 Kessels Rd, Nathan, Queensland, 4111, Australia.); Burford MA ( Australian Rivers Institute, Griffith University, 170 Kessels Rd, Nathan, Queensland, 4111, Australia.)
Abstract	Nitrogen fixation has been proposed as a mechanism that allows the diazotrophic cyanobacterium, Cylindrospermopsis raciborskii, to bloom in nitrogen-limited freshwater systems. However, it is unclear whether dinitrogen fixation $(N_{2}$ fixation) can supplement available dissolved inorganic nitrogen (DIN) for growth, or only provides minimum nitrogen (N) for cell maintenance under DIN deplete conditions. Additionally, the rate at which cells can switch between DIN use and $N_{2}$ fixation is unknown. This study investigated $N_{2}$ fixation under a range of nitrate concentrations. Cultures were grown with pretreatments of nitrate replete (single dose 941 μmol NO 3 − $ · L^{−1})$ and N-free conditions and then either received a single dose of 941 μmol NO 3 − $ · L^{−1}$ (N941), 118 μmol NO 3 − $ · L^{−1}$ (N118) or 0 N. Heterocysts appeared from days 3 to 5 when treatments of high NO 3 − were transferred to N free media (N941:N0), and from day 5 in N941 transferred to N118 treatments. Conversely, transferring cells from N0 to N941 resulted in heterocysts being discarded from day 3 and day 5 for N0:N118. Heterocyst appearance correlated with a detectable rate of $N_{2}$ fixation and up-regulation of nifH gene expression, the discard of heterocysts occurred after sequential reduction of nifH expression and $N_{2}$ fixation. Nitrate uptake rates were not affected by pretreatment, suggesting no regulation or saturation of this uptake pathway. These data demonstrate that for C. raciborskii, $N_{2}$ fixation is regulated by the production or discard of heterocysts. In conclusion, this study has shown that $N_{2}$ fixation only provides enough N to support relatively low growth under N-limited conditions, and does not supplement available nitrate to increase growth rates.
File Format	HTM / HTML
ISSN	00223646
Issue Number	5
Journal	Journal of Phycology
Volume Number	52
e-ISSN	15298817
Language	English
Publisher	Wiley
Publisher Date	2016-10-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Botany
Content Type	Text
Resource Type	Article
Subject	Plant Science Aquatic Science

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Nitrogen uptake and fixation in the cyanobacterium Cylindrospermopsis raciborskii under different nitrogen conditions

Effect of nitrogen forms on growth, cell composition and N2 fixation of Cylindrospermopsis raciborskii in phosphorus-limited chemostat cultures

Photosynthetic characteristics of two Cylindrospermopsis raciborskii strains differing in their toxicity

FACTORS RELATED TO THE DOMINANCE OF CYLINDROSPERMOPSIS RACIBORSKII (CYANOBACTERIA) IN A SHALLOW POND IN NORTHERN TAIWAN(1).

Impact of Nitrogen Sources on Gene Expression and Toxin Production in the Diazotroph Cylindrospermopsis raciborskii CS-505 and Non-Diazotroph Raphidiopsis brookii D9

INTERACTIVE EFFECTS OF IRRADIANCE AND $CO_{2}$ ON $CO_{2}$ FIXATION AND $N_{2}$ FIXATION IN THE DIAZOTROPH TRICHODESMIUM ERYTHRAEUM $(CYANOBACTERIA)^{†}$

DIFFERENTIAL RESPONSES OF ANABAENA SP. PCC 7120 (CYANOPHYCEAE) CULTURED IN NITROGEN-DEFICIENT AND NITROGEN-ENRICHED MEDIA TO ULTRAVIOLET-B RADIATION(1).

Impact of Nitrogen Sources on Gene Expression and Toxin Production in the Diazotroph Cylindrospermopsis raciborskii CS-505 and Non-Diazotroph Raphidiopsis brookii D9

Appearance of Cylindrospermopsis raciborskii in winter in an artificial pond in northern Taiwan

Nitrogen fixation by the diazotroph Cylindrospermopsis raciborskii (Cyanophyceae)

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Nitrogen uptake and fixation in the cyanobacterium Cylindrospermopsis raciborskii under different nitrogen conditions

Effect of nitrogen forms on growth, cell composition and N2 fixation of Cylindrospermopsis raciborskii in phosphorus-limited chemostat cultures

Photosynthetic characteristics of two Cylindrospermopsis raciborskii strains differing in their toxicity

FACTORS RELATED TO THE DOMINANCE OF CYLINDROSPERMOPSIS RACIBORSKII (CYANOBACTERIA) IN A SHALLOW POND IN NORTHERN TAIWAN(1).

Impact of Nitrogen Sources on Gene Expression and Toxin Production in the Diazotroph Cylindrospermopsis raciborskii CS-505 and Non-Diazotroph Raphidiopsis brookii D9

INTERACTIVE EFFECTS OF IRRADIANCE AND $CO_{2}$ ON $CO_{2}$ FIXATION AND $N_{2}$ FIXATION IN THE DIAZOTROPH TRICHODESMIUM ERYTHRAEUM $(CYANOBACTERIA)^{†}$

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Impact of Nitrogen Sources on Gene Expression and Toxin Production in the Diazotroph Cylindrospermopsis raciborskii CS-505 and Non-Diazotroph Raphidiopsis brookii D9

Appearance of Cylindrospermopsis raciborskii in winter in an artificial pond in northern Taiwan

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