2024-03-29T00:34:14Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/110912020-02-03T20:02:25Zcom_10261_132com_10261_8com_10261_88col_10261_385col_10261_341
DIGITAL.CSIC
author
Terrados, Jorge
author
Williams, Susan L.
2009-02-27T12:50:43Z
2009-02-27T12:50:43Z
1997-04-10
Marine Ecology Progress Series (MEPS) 149: 267-277 (1997)
0171-8630
http://hdl.handle.net/10261/11091
10.3354/meps149267
1616-1599
Phyllospadix 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.
eng
openAccess
Ammonium
Nitrate
Leaf uptake
Root uptake
Phyllospadix
Seagrasses
Leaf versus root nitrogen uptake by the surfgrass Phyllospadix torreyi
artículo
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URL
https://digital.csic.es/bitstream/10261/11091/1/m149p267.pdf
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URL
https://digital.csic.es/bitstream/10261/11091/4/m149p267.pdf.txt
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m149p267.pdf.txt