Delayed NH3 and N2 O uptake by maize leaves
G L Grundmann1, R Lensi1, A Chalamet1
1Laboratoire d'Ecologie Microbienne du Sol, URA CNRS 1450, Université Claude Bernard Lyon I, 43 Bd du 11 Novembre 1918, 69622 Villeurbanne Cedex France.
Abstract:
15 N was used to give evidence of NH3 and N2 O 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 N2 O uptake.
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