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Delayed NH3 and N2O uptake by maize leaves

Authors

  • G. L. GRUNDMANN,

    Corresponding author
    1. Laboratoire d'Ecologie Microbienne du Sol, URA CNRS 1450, Université Claude Bernard Lyon I, 43 Bd du 11 Novembre 1918, 69622 Villeurbanne Cedex France
      *To whom correspondence should be addressed at: Laboratoire de Biologie Alpine, Université Joseph Fourier, BP 53×38041 Grenoble Cedex, France.
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  • R. LENSI,

    1. Laboratoire d'Ecologie Microbienne du Sol, URA CNRS 1450, Université Claude Bernard Lyon I, 43 Bd du 11 Novembre 1918, 69622 Villeurbanne Cedex France
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  • A. CHALAMET

    1. Laboratoire d'Ecologie Microbienne du Sol, URA CNRS 1450, Université Claude Bernard Lyon I, 43 Bd du 11 Novembre 1918, 69622 Villeurbanne Cedex France
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*To whom correspondence should be addressed at: Laboratoire de Biologie Alpine, Université Joseph Fourier, BP 53×38041 Grenoble Cedex, France.

SUMMARY

15N was used to give evidence of NH3 and N2O absorption by maize leaves. A short-term labelling method (90 min) was chosen with high NH3 concentration (40 μ1 1−1) to assess uptake mechanisms. Two initial entry pathways were suggested for NH3: fast uptake with immediate metabolism and fast storage with progressive metabolism. A storage compartment delayed NH3 absorption after exposure. Similar mechanisms might be involved in N2O uptake.

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