16 research outputs found
Biophysical Characterization of Mesophyll and Bundle Sheath Chloroplasts Isolated From the Leaves of Eleusine coracana, an Aspartate-Type C4 Plant. II. Photosynthetic Electron Transfer and Energy Conservation Reactions
Photosynthetic characteristics of mesophyll eells isolated from sunflower (helianthus annuus L.) leaves
Molecular biology of C4 photosynthesis in Zea mays: differential localization of proteins and mRNAs in the two leaf cell types
An efficient protocol for perennial ryegrass mesophyll protoplast isolation and transformation, and its application on interaction study between LpNOL and LpNYC1
Sulfide oxidation and carbon fixation by the gutless clamSolemya reidi: an animal-bacteria symbiosis
Incubation of Aquilaria subintegra with Microbial Culture Supernatants Enhances Production of Volatile Compounds and Improves Quality of Agarwood Oil
Plants increase CO2 uptake by assimilating nitrogen via the photorespiratory pathway
Photorespiration is a major bioengineering target for increasing crop yields as it is often considered a wasteful process. Photorespiratory metabolism is integrated into leaf metabolism and thus may have certain benefits. Here, we show that plants can increase their rate of photosynthetic CO2 uptake when assimilating nitrogen de novo via the photorespiratory pathway by fixing carbon as amino acids in addition to carbohydrates. Plants fed NO3 - had higher rates of CO2 assimilation under photorespiratory than low-photorespiratory conditions, while plants lacking NO3 - nutrition exhibited lower stimulation of CO2 uptake. We modified the widely used Farquhar, von Caemmerer and Berry photosynthesis model to include the carbon and electron requirements for nitrogen assimilation via the photorespiratory pathway. Our modified model improves predictions of photosynthetic CO2 uptake and of rates of photosynthetic electron transport. The results highlight how photorespiration can improve photosynthetic performance despite reducing the efficiency of Rubisco carboxylation.</p