Evidence for a CO-concentrating mechanism in the model streptophyte green alga Chara braunii.
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| Natura: | Artículo científico |
| Lingua: | en |
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The New phytologist
2025
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| _version_ | 1868266191336767490 |
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| author | Heise, Carolin M Heß, Daniel A Walke, Peter Voß, Maren Schubert, Hendrik Hess, Wolfgang R Hagemann, Martin |
| author_facet | Heise, Carolin M Heß, Daniel A Walke, Peter Voß, Maren Schubert, Hendrik Hess, Wolfgang R Hagemann, Martin Heise, Carolin M Heß, Daniel A Walke, Peter Voß, Maren Schubert, Hendrik Hess, Wolfgang R Hagemann, Martin |
| collection | PubMed - marine biology |
| contents | Evidence for a CO-concentrating mechanism in the model streptophyte green alga Chara braunii. Heise, Carolin M Heß, Daniel A Walke, Peter Voß, Maren Schubert, Hendrik Hess, Wolfgang R Hagemann, Martin Carbon Dioxide Photosynthesis Gene Expression Regulation, Plant Models, Biological Carbon Isotopes Carbon Chlorophyta Transcriptome Oxygenic photosynthesis in streptophytic algae, such as Charophyceae, is often impeded by low CO levels in aquatic habitats. Consequently, many algal groups evolved a CO-concentrating mechanism (CCM). However, its presence in Charophyceae remains controversial. To explore this, we analyzed the acclimation of photosynthesis, carbon isotope composition, and gene expression in Chara braunii under varying inorganic carbon (Ci) conditions. The photosynthetic activity changed complementarily under low- or high-Ci levels. Notably, the Ci compensation point of photosynthesis was significantly lower in thalli grown at ambient Ci than in elevated Ci. Correspondingly, the delta C levels were lower in thalli from high than low Ci. These results indicate that C. braunii performs a CCM under low Ci, which is suppressed under high Ci. Transcriptomic analyses of algae from different Ci cultivations provided insight into Ci-regulated genes and pointed to the possible association between carbonic anhydrases and aquaporins with the CCM. Collectively, our results indicate that C. braunii expresses a CCM allowing efficient use of CO and bicarbonate under limiting Ci conditions. A tentative scenario is provided summarizing the role of potential players in the CCM. |
| format | Artículo científico |
| id | pubmed_40515453 |
| institution | PubMed |
| language | en |
| publishDate | 2025 |
| publisher | The New phytologist |
| record_format | pubmed |
| spellingShingle | Evidence for a CO-concentrating mechanism in the model streptophyte green alga Chara braunii. Heise, Carolin M Heß, Daniel A Walke, Peter Voß, Maren Schubert, Hendrik Hess, Wolfgang R Hagemann, Martin Carbon Dioxide Photosynthesis Gene Expression Regulation, Plant Models, Biological Carbon Isotopes Carbon Chlorophyta Transcriptome Evidence for a CO-concentrating mechanism in the model streptophyte green alga Chara braunii. Heise, Carolin M Heß, Daniel A Walke, Peter Voß, Maren Schubert, Hendrik Hess, Wolfgang R Hagemann, Martin Carbon Dioxide Photosynthesis Gene Expression Regulation, Plant Models, Biological Carbon Isotopes Carbon Chlorophyta Transcriptome Oxygenic photosynthesis in streptophytic algae, such as Charophyceae, is often impeded by low CO levels in aquatic habitats. Consequently, many algal groups evolved a CO-concentrating mechanism (CCM). However, its presence in Charophyceae remains controversial. To explore this, we analyzed the acclimation of photosynthesis, carbon isotope composition, and gene expression in Chara braunii under varying inorganic carbon (Ci) conditions. The photosynthetic activity changed complementarily under low- or high-Ci levels. Notably, the Ci compensation point of photosynthesis was significantly lower in thalli grown at ambient Ci than in elevated Ci. Correspondingly, the delta C levels were lower in thalli from high than low Ci. These results indicate that C. braunii performs a CCM under low Ci, which is suppressed under high Ci. Transcriptomic analyses of algae from different Ci cultivations provided insight into Ci-regulated genes and pointed to the possible association between carbonic anhydrases and aquaporins with the CCM. Collectively, our results indicate that C. braunii expresses a CCM allowing efficient use of CO and bicarbonate under limiting Ci conditions. A tentative scenario is provided summarizing the role of potential players in the CCM. |
| title | Evidence for a CO-concentrating mechanism in the model streptophyte green alga Chara braunii. |
| topic | Carbon Dioxide Photosynthesis Gene Expression Regulation, Plant Models, Biological Carbon Isotopes Carbon Chlorophyta Transcriptome |
| url | https://pubmed.ncbi.nlm.nih.gov/40515453/ |