The role of heterocytes in the physiology and ecology of bloom-forming harmful cyanobacteria
Dolichospermum flos-aquae and Cylindrospermopsis raciborskii are two cyanobacteria species which cause harmful blooms around the world. Both these species share the capacity to fix atmospheric nitrogen in heterocytes (cell where fixation occurs). While Dolichospermum can express heterocytes at rathe...
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15689883_v60_n_p131_Yema http://hdl.handle.net/20.500.12110/paper_15689883_v60_n_p131_Yema |
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paper:paper_15689883_v60_n_p131_Yema2023-06-08T16:24:09Z The role of heterocytes in the physiology and ecology of bloom-forming harmful cyanobacteria De Tezanos Pinto, Paula Cylindrospermopsis Dolichospermum Heterocyte Nitrogen fixation Nostocales Phosphorus nitrogen phosphorus biomass cyanobacterium Cylindrospermopsis eutrophication metabolism nitrogen fixation physiology Biomass Cyanobacteria Cylindrospermopsis Eutrophication Nitrogen Nitrogen Fixation Phosphorus Dolichospermum flos-aquae and Cylindrospermopsis raciborskii are two cyanobacteria species which cause harmful blooms around the world. Both these species share the capacity to fix atmospheric nitrogen in heterocytes (cell where fixation occurs). While Dolichospermum can express heterocytes at rather regular intervals across the filament, Cylindrospermopsis can only express heterocytes at the end of the filament. The aim of this study was to experimentally assess the role of heterocyte position in the eco-physiological responses of these bloom forming cyanobacteria. Replicated monocultures of each species were grown at different eutrophication scenarios (limiting and sufficient nitrogen and phosphorus concentrations, in factorial design). Dolichospermum reached high biomass regardless of the nitrogen (and phosphorus) provided, suggesting that this species could bloom in situations with and without nitrogen limitation. In contrast, Cylindrospermopsis reached high biomass only when nitrogen supply was high; its biomass was 15-20 times lower when relying on nitrogen fixation. Hence, despite its ability to fix nitrogen, blooms of Cylindrospermopsis would be expected only under high total nitrogen availability. In Dolichospermum heterocytes occurred only in the scenarios without supplied nitrogen while in Cylindrospermopsis heterocytes occurred regardless of nitrogen availability. Yet, in both species nitrogen fixation occurred (heterocytes were functional) only when nitrogen was limiting, and nitrogen fixation increased significantly at higher phosphorus concentration. Finally, in the absence of supplied nitrogen, filament length in Dolichospermum was the longest, while filaments in Cylindrospermopsis were the shortest (up to 13 times shorter than at nitrogen sufficiency). Therefore, heterocyte expression in Dolichospermum, and filament length in Cylindrospermopsis seem good proxies of nitrogen fixation. The eco-physiological responses recorded here help understand the distribution of these species along nutrient gradients in nature. © 2016 Elsevier B.V. Fil:de Tezanos Pinto, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15689883_v60_n_p131_Yema http://hdl.handle.net/20.500.12110/paper_15689883_v60_n_p131_Yema |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Cylindrospermopsis Dolichospermum Heterocyte Nitrogen fixation Nostocales Phosphorus nitrogen phosphorus biomass cyanobacterium Cylindrospermopsis eutrophication metabolism nitrogen fixation physiology Biomass Cyanobacteria Cylindrospermopsis Eutrophication Nitrogen Nitrogen Fixation Phosphorus |
| spellingShingle |
Cylindrospermopsis Dolichospermum Heterocyte Nitrogen fixation Nostocales Phosphorus nitrogen phosphorus biomass cyanobacterium Cylindrospermopsis eutrophication metabolism nitrogen fixation physiology Biomass Cyanobacteria Cylindrospermopsis Eutrophication Nitrogen Nitrogen Fixation Phosphorus De Tezanos Pinto, Paula The role of heterocytes in the physiology and ecology of bloom-forming harmful cyanobacteria |
| topic_facet |
Cylindrospermopsis Dolichospermum Heterocyte Nitrogen fixation Nostocales Phosphorus nitrogen phosphorus biomass cyanobacterium Cylindrospermopsis eutrophication metabolism nitrogen fixation physiology Biomass Cyanobacteria Cylindrospermopsis Eutrophication Nitrogen Nitrogen Fixation Phosphorus |
| description |
Dolichospermum flos-aquae and Cylindrospermopsis raciborskii are two cyanobacteria species which cause harmful blooms around the world. Both these species share the capacity to fix atmospheric nitrogen in heterocytes (cell where fixation occurs). While Dolichospermum can express heterocytes at rather regular intervals across the filament, Cylindrospermopsis can only express heterocytes at the end of the filament. The aim of this study was to experimentally assess the role of heterocyte position in the eco-physiological responses of these bloom forming cyanobacteria. Replicated monocultures of each species were grown at different eutrophication scenarios (limiting and sufficient nitrogen and phosphorus concentrations, in factorial design). Dolichospermum reached high biomass regardless of the nitrogen (and phosphorus) provided, suggesting that this species could bloom in situations with and without nitrogen limitation. In contrast, Cylindrospermopsis reached high biomass only when nitrogen supply was high; its biomass was 15-20 times lower when relying on nitrogen fixation. Hence, despite its ability to fix nitrogen, blooms of Cylindrospermopsis would be expected only under high total nitrogen availability. In Dolichospermum heterocytes occurred only in the scenarios without supplied nitrogen while in Cylindrospermopsis heterocytes occurred regardless of nitrogen availability. Yet, in both species nitrogen fixation occurred (heterocytes were functional) only when nitrogen was limiting, and nitrogen fixation increased significantly at higher phosphorus concentration. Finally, in the absence of supplied nitrogen, filament length in Dolichospermum was the longest, while filaments in Cylindrospermopsis were the shortest (up to 13 times shorter than at nitrogen sufficiency). Therefore, heterocyte expression in Dolichospermum, and filament length in Cylindrospermopsis seem good proxies of nitrogen fixation. The eco-physiological responses recorded here help understand the distribution of these species along nutrient gradients in nature. © 2016 Elsevier B.V. |
| author |
De Tezanos Pinto, Paula |
| author_facet |
De Tezanos Pinto, Paula |
| author_sort |
De Tezanos Pinto, Paula |
| title |
The role of heterocytes in the physiology and ecology of bloom-forming harmful cyanobacteria |
| title_short |
The role of heterocytes in the physiology and ecology of bloom-forming harmful cyanobacteria |
| title_full |
The role of heterocytes in the physiology and ecology of bloom-forming harmful cyanobacteria |
| title_fullStr |
The role of heterocytes in the physiology and ecology of bloom-forming harmful cyanobacteria |
| title_full_unstemmed |
The role of heterocytes in the physiology and ecology of bloom-forming harmful cyanobacteria |
| title_sort |
role of heterocytes in the physiology and ecology of bloom-forming harmful cyanobacteria |
| publishDate |
2016 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15689883_v60_n_p131_Yema http://hdl.handle.net/20.500.12110/paper_15689883_v60_n_p131_Yema |
| work_keys_str_mv |
AT detezanospintopaula theroleofheterocytesinthephysiologyandecologyofbloomformingharmfulcyanobacteria AT detezanospintopaula roleofheterocytesinthephysiologyandecologyofbloomformingharmfulcyanobacteria |
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