ArticlePhotosynthesis research2014
Biochemical and biophysical CO2 concentrating mechanisms in two species of freshwater macrophyte within the genus Ottelia (Hydrocharitaceae).
Article in Photosynthesis research, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers.
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23 citing papers in PubMed, 85 citations in OpenAlex.
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- Open questions on facultative C4-CAM photosynthesis in Portulaca.Journal of experimental botany · 2026Review
- Comprehensive Investigation into the Antioxidant Phytochemicals and Molecular Mechanisms of the GenusInternational journal of molecular sciences · 2026Article
- A novel single-cell NAD-ME CThe New phytologist · 2026Article
- Inorganic carbon utilization strategies of plateau aquatic plants in response to native habitats.Photosynthesis research · 2024Article
- The CAM lineages of planet Earth.Annals of botany · 2023Article
- The diverse diaspora of CAM: a pole-to-pole sketch.Annals of botany · 2023Review
- Different photosynthetic inorganic carbon utilization strategies in the heteroblastic leaves of an aquatic plantFrontiers in plant science · 2023Article
- Evolution of an intermediate CPhotosynthesis research · 2022Review
- Gene co-expression reveals the modularity and integration of C4 and CAM in Portulaca.Plant physiology · 2022Article
- Carbon and nitrogen metabolic regulation in freshwater plantFrontiers in plant science · 2022Article
- Transition From Proto-Kranz-Type Photosynthesis to HCOFrontiers in plant science · 2021Article
- Article
- Structural basis for C4 photosynthesis without Kranz anatomy in leaves of the submerged freshwater plant Ottelia alismoides.Annals of botany · 2020Article
- Insights on the Functions and Ecophysiological Relevance of the Diverse Carbonic Anhydrases in Microalgae.International journal of molecular sciences · 2020Review
- Responses of Leaf Anatomy and COFrontiers in plant science · 2020Article
- Different COPhotosynthesis research · 2018Article
- The intracellular distribution of inorganic carbon fixing enzymes does not support the presence of a C4 pathway in the diatom Phaeodactylum tricornutum.Photosynthesis research · 2018Article
- The Analysis of Leaf Traits of EightFrontiers in plant science · 2018Article
- Inorganic carbon availability in benthic diatom communities: photosynthesis and migration.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2017Review
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6 authors at 5 institutions in 3 countries.
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No grant is acknowledged in the PubMed record.
Abstract
Two freshwater macrophytes, Ottelia alismoides and O. acuminata, were grown at low (mean 5 μmol L(-1)) and high (mean 400 μmol L(-1)) CO2 concentrations under natural conditions. The ratio of PEPC to RuBisCO activity was 1.8 in O. acuminata in both treatments. In O. alismoides, this ratio was 2.8 and 5.9 when grown at high and low CO2, respectively, as a result of a twofold increase in PEPC activity. The activity of PPDK was similar to, and changed with, PEPC (1.9-fold change). The activity of the decarboxylating NADP-malic enzyme (ME) was very low in both species, while NAD-ME activity was high and increased with PEPC activity in O. alismoides. These results suggest that O. alismoides might perform a type of C4 metabolism with NAD-ME decarboxylation, despite lacking Kranz anatomy. The C4-activity was still present at high CO2 suggesting that it could be constitutive. O. alismoides at low CO2 showed diel acidity variation of up to 34 μequiv g(-1) FW indicating that it may also operate a form of crassulacean acid metabolism (CAM). pH-drift experiments showed that both species were able to use bicarbonate. In O. acuminata, the kinetics of carbon uptake were altered by CO2 growth conditions, unlike in O. alismoides. Thus, the two species appear to regulate their carbon concentrating mechanisms differently in response to changing CO2. O. alismoides is potentially using three different concentrating mechanisms. The Hydrocharitaceae have many species with evidence for C4, CAM or some other metabolism involving organic acids, and are worthy of further study.
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