Bringing home the carbon: photorespiratory CO₂ recovery shows diverse efficiency in Brassicaceae.

This article examines the efficiency and diversity of photorespiration, a metabolic pathway in plants that has traditionally been seen as wasteful. The authors focus on the Brassicaceae family, which includes important crop species, and investigate the presence of C3-C4 intermediates, plants that use a photorespiratory shuttle to concentrate carbon. They find that C3-C4 intermediacy is rare but present in some members of the Brassicaceae family, and they analyze the metabolic variation within this family compared to their closest C4 relative. The study provides insights into the evolution and optimization of photosynthetic pathways in different plant species. Additionally, the article discusses the potential of C3-C4 intermediates to enhance climate resilience in the face of climate change. The authors conducted a study on 28 species of Brassicaceae, a plant family without C4 relatives, and discovered significant diversity in their photosynthetic characteristics. They found that C3-C4 intermediates can efficiently reclaim CO2 and improve water use efficiency in low CO2 conditions, making them more adaptable to climate variability and abiotic stress compared to other photosynthetic types. The authors propose that these findings could be utilized to ensure food production and enhance agricultural sustainability in the future. [Extracted from the article]