Freshwater angiosperm carbon concentrating mechanisms: processes and patterns

Area of Science:

• Plant Biology
• Aquatic Ecology
• Photosynthesis Research

Background:

• Aquatic angiosperms evolved from terrestrial plants, adapting to underwater life.
• Freshwater environments present challenges like low and fluctuating carbon dioxide (CO2) and light availability.

Purpose of the Study:

• To review structural, morphological, physiological, and biochemical adaptations of freshwater macrophytes.
• To discuss how inorganic carbon influences macrophyte ecology and net carbon uptake.

Main Methods:

• Literature review of adaptations in freshwater macrophytes.
• Analysis of strategies for maximizing underwater carbon uptake.
• Discussion of inorganic carbon utilization and its ecological implications.

Main Results:

• Submerged leaves often show low photosynthetic capacity due to limited CO2 and light.
• Adaptations include aerial/floating leaves, root-associated CO2 supply, and physiological mechanisms.
• Bicarbonate (HCO3-) utilization is a widespread strategy, common in high-alkalinity lakes and elodeids.

Conclusions:

• Freshwater macrophytes employ a range of strategies to overcome carbon limitation.
• Bicarbonate use is a key adaptation for many submerged aquatic plants.
• Environmental factors regulate these strategies to optimize growth rates.