Different strategies of nitrogen acquisition in two tropical seagrasses under nitrogen enrichment
Inés G. Viana
Daniel Arturo Saavedra‐Hortúa
Matern Mtolera
Mirta Teichberg
Abstract
Tropical marine seagrasses live in environments with low nutrient concentrations. However, as land development intensifies along tropical coastlines, the marine environment in which these organisms grow is becoming more nutrient‐rich.
Nitrogen (N) uptake, assimilation, translocation and storage under a diversity of N sources in enriched conditions were investigated in two tropical seagrass species, Cymodocea serrulata and Thalassia hemprichii, from an oligotrophic marine environment.
Both seagrasses were able to take up different inorganic and organic N sources through their above‐ and belowground tissues when enriched with high N concentrations. The uptake rates of T. hemprichii were generally higher than C. serrulata in leaves and rhizome, whereas root uptake was systematically higher in C. serrulata.
Acropetal and basipetal translocation was observed in both species. Reduction and assimilation of N, measured in terms of their nitrate reductase and glutamine synthetase activity, were correlated with nitrate and ammonium uptake rates, respectively. Cymodocea serrulata showed a tendency to immediately use the available N, whereas T. hemprichii allocated more N in assimilation and storage investment. The responses of these seagrasses to N‐enrichment demonstrate their ability to adapt to over‐enrichment by varying N sources in the first step of the eutrophication process.
Viana I.G., Saavedra‐Hortúa D.A., Mtolera M. and Teichberg M. (2019) Different strategies of nitrogen acquisition in two tropical seagrasses under nitrogen enrichment. New Phytologist 223(3): 1217-1229. 10.1111/nph.15885
@article{Viana2019,
Title = {Different strategies of nitrogen acquisition in two tropical seagrasses under nitrogen enrichment},
Author = {Viana, Inés G. and Saavedra‐Hortúa, Daniel Arturo and Mtolera, Matern and Teichberg, Mirta},
Editor = {},
Journal = {New Phytologist},
Year = {2019},
Pages = {1217-1229},
Volume = {223},
Doi = {10.1111/nph.15885},
Abstract = {Tropical marine seagrasses live in environments with low nutrient concentrations. However, as land development intensifies along tropical coastlines, the marine environment in which these organisms grow is becoming more nutrient‐rich.
Nitrogen (N) uptake, assimilation, translocation and storage under a diversity of N sources in enriched conditions were investigated in two tropical seagrass species, Cymodocea serrulata and Thalassia hemprichii, from an oligotrophic marine environment.
Both seagrasses were able to take up different inorganic and organic N sources through their above‐ and belowground tissues when enriched with high N concentrations. The uptake rates of T. hemprichii were generally higher than C. serrulata in leaves and rhizome, whereas root uptake was systematically higher in C. serrulata.
Acropetal and basipetal translocation was observed in both species. Reduction and assimilation of N, measured in terms of their nitrate reductase and glutamine synthetase activity, were correlated with nitrate and ammonium uptake rates, respectively. Cymodocea serrulata showed a tendency to immediately use the available N, whereas T. hemprichii allocated more N in assimilation and storage investment. The responses of these seagrasses to N‐enrichment demonstrate their ability to adapt to over‐enrichment by varying N sources in the first step of the eutrophication process.},
}
TY - JOUR
AU - Viana, Inés G.
AU - Saavedra‐Hortúa, Daniel Arturo
AU - Mtolera, Matern
AU - Teichberg, Mirta
TI - Different strategies of nitrogen acquisition in two tropical seagrasses under nitrogen enrichment
T2 - New Phytologist
PY - 2019
SP - 1217-1229
VL - 223
DO - 10.1111/nph.15885
AB - Tropical marine seagrasses live in environments with low nutrient concentrations. However, as land development intensifies along tropical coastlines, the marine environment in which these organisms grow is becoming more nutrient‐rich.
Nitrogen (N) uptake, assimilation, translocation and storage under a diversity of N sources in enriched conditions were investigated in two tropical seagrass species, Cymodocea serrulata and Thalassia hemprichii, from an oligotrophic marine environment.
Both seagrasses were able to take up different inorganic and organic N sources through their above‐ and belowground tissues when enriched with high N concentrations. The uptake rates of T. hemprichii were generally higher than C. serrulata in leaves and rhizome, whereas root uptake was systematically higher in C. serrulata.
Acropetal and basipetal translocation was observed in both species. Reduction and assimilation of N, measured in terms of their nitrate reductase and glutamine synthetase activity, were correlated with nitrate and ammonium uptake rates, respectively. Cymodocea serrulata showed a tendency to immediately use the available N, whereas T. hemprichii allocated more N in assimilation and storage investment. The responses of these seagrasses to N‐enrichment demonstrate their ability to adapt to over‐enrichment by varying N sources in the first step of the eutrophication process.
ER -
