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Ammonium and nitrate uptake in gap, generalist and understory species of the genus Piper by Arthur L. Fredeen; Christopher B. Field is a Environmental Science article available to read on EtoBox.

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We studied root net uptake of ammonium (NH ) and nitrate (NO ) in species of the genus Piper (Piperaceae) under high, intermediate and low photosynthetically active photon flux densities (PFD). Plants were grown hydroponically, and then transferred to temperature controlled (25° C) root cuvettes for nutrient uptake determinations. Uptake solutions provided NH and NO simultaneously (both) or separately (single). In the first experiment, seven species of Piper, from a broad range of rainforest light habitats ranging from gap to understory, were screened for mineral nitrogen preference (100 μM NH and/or 100 μM NO ) at intermediate PFD (100 μmol m s). Preference for NH relative to NO , defined as the ratio of NH (both):NO (both) net uptake, was higher in understory species than in gap species. Ammonium repression of NO uptake, defined as the ratio of NO (single): NO (both) net uptake, was also higher in understory species as compared to gap species. In a second set of experiments, we examined the effect of nitrogen concentration (equimolar, 10 to 1000 μM) on NH preference and NH repression of NO net uptake at high (500 μmol m s) and low (50 μmol m s) PFD in a gap (P. auritum), generali

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Author

Arthur L. Fredeen; Christopher B. Field

Publisher

Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC (ISSN 0029-8549)

Published

1992

Language

EN

Field

Environmental Science (Physical Sciences)