Nitrogen assimilation and growth of wheat under elevated carbon dioxide
Authors: Bloom Arnold J. , Smart David R. , Nguyen Duy T. , Searles Peter S. 
Published: July 2002

Simultaneous measurements of CO
2
and O
2
fluxes from wheat (
Triticum aestivum
) shoots indicated that short-term exposures to elevated CO
2
concentrations diverted photosynthetic reductant from NO

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or NO

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reduction to CO
2
fixation. With longer exposures to elevated CO
2
, wheat leaves showed a diminished capacity for NO

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photoassimilation at any CO
2
concentration. Moreover, high bicarbonate levels impeded NO

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translocation into chloroplasts isolated from wheat or pea leaves. These results support the hypothesis that elevated CO
2
inhibits NO

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photoassimilation. Accordingly, when wheat plants received NO

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rather than NH

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as a nitrogen source, CO
2
enhancement of shoot growth halved and CO
2
inhibition of shoot protein doubled. This result will likely have major implications for the ability of wheat to use NO

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as a nitrogen source under elevated CO
2
.