Plants increase CO2 uptake by assimilating nitrogen via the photorespiratory pathway

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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Plants Springer Journals

Plants increase CO2 uptake by assimilating nitrogen via the photorespiratory pathway

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Publisher
Springer Journals
Copyright
Copyright © 2017 by The Author(s)
Subject
Life Sciences; Life Sciences, general; Plant Sciences
eISSN
2055-0278
D.O.I.
10.1038/s41477-017-0065-x
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Nature PlantsSpringer Journals

Published: Dec 11, 2017

References

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