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Title

Leaf versus root nitrogen uptake by the surfgrass Phyllospadix torreyi

AuthorsTerrados, Jorge ; Williams, Susan L.
KeywordsAmmonium
Nitrate
Leaf uptake
Root uptake
Phyllospadix
Seagrasses
Issue Date10-Apr-1997
PublisherInter Research
CitationMarine Ecology Progress Series (MEPS) 149: 267-277 (1997)
AbstractPhyllospadix torreyi S. Watson ('surfgrass') is one of very few seagrass species that grow on rocks. Thus, unlike most other seagrasses, nutrient uptake across leaves rather than across roots might be very important for nutrient acquisition. Ammonium and nitrate+nitrite uptake by surfgrass leaves was measured under flowing water and modelled (Michaelis-Menten) as a function of external concentrations. Leaf NH4+ uptake showed a Km of 17.4 µM and a Vmax of 125.1 µmol N g dry wt(-1) h(-1). Km and Vmax values for leaf NO3- + NO2- uptake were 10.1 µM and 54.5 µmol N g dry wt(-1) h(-1), respectively. Ammonium available to the roots had little discernible effect on NH4+ uptake by leaves. Low NH4+ uptake rates by roots (<0.2 µmol N g dry wt(-1) h(-1) suggest that surfgrass acquires most of its nitrogen via its leaves.
Description11 pages, 6 figures.
Publisher version (URL)http://dx.doi.org/10.3354/meps149267
URIhttp://hdl.handle.net/10261/11091
DOI10.3354/meps149267
ISSN0171-8630
E-ISSN1616-1599
Appears in Collections:(IMEDEA) Artículos
(CEAB) Artículos
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