Growth, nitrogen uptake, and metabolism in two semiarid shrubs grown at ambient and elevated atmospheric CO2 concentrations: Effects of nitrogen supply and source

The effect of differences in nitrogen (N) availability and source on growth and nitrogen metabolism at different atmospheric CO2 concentrations in Prosopis glandulosa and Prosopis flexuosa (native to semiarid regions of North and South America, respectively) was examined. Total biomass, allocation,...

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Autores principales: Causin, H.F., Tremmel, D.C., Rufty, T.W., Reynolds, J.F.
Formato: JOUR
Materias:
Ammonium
CO2
Controlled environments
Nitrate
Nitrogen metabolism
Nitrogen uptake
Prosopis flexuosa
Prosopis glandulosa
carbon dioxide
growth
metabolism
nitrogen
nutrient uptake
semiarid region
shrub
Prosopis
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00029122_v91_n4_p565_Causin
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00029122_v91_n4_p565_Causin
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spelling todo:paper_00029122_v91_n4_p565_Causin2023-10-03T13:54:40Z Growth, nitrogen uptake, and metabolism in two semiarid shrubs grown at ambient and elevated atmospheric CO2 concentrations: Effects of nitrogen supply and source Causin, H.F. Tremmel, D.C. Rufty, T.W. Reynolds, J.F. Ammonium CO2 Controlled environments Nitrate Nitrogen metabolism Nitrogen uptake Prosopis flexuosa Prosopis glandulosa carbon dioxide growth metabolism nitrogen nutrient uptake semiarid region shrub Prosopis Prosopis flexuosa Prosopis flexuosa Prosopis glandulosa Prosopis glandulosa The effect of differences in nitrogen (N) availability and source on growth and nitrogen metabolism at different atmospheric CO2 concentrations in Prosopis glandulosa and Prosopis flexuosa (native to semiarid regions of North and South America, respectively) was examined. Total biomass, allocation, N uptake, and metabolites (e.g., free NO3 -, soluble proteins, organic acids) were measured in seedlings grown in controlled environment chambers for 48 d at ambient (350 ppm) and elevated (650 ppm) CO2 and fertilized with high (8.0 mmol/L) or low (0.8 mmol/L) N (N,level), supplied at either 1:1 or 3:1 NO3 -:NH4 + ratios (Nsource). Responses to elevated CO2 depended on both Nlevel and N source, with the largest effects evident at high Nlevel. A high NO3 -:NH4 + ratio stimulated growth responses to elevated CO2 in both species when N was limiting and increased the responses of P. flexuosa at high Nlevel. Significant differences in N uptake and metabolites were found between species. Seedlings of both species are highly responsive to N availability and will benefit from increases in CO2, provided that a high proportion of NO3- to NH4-N is present in the soil solution. This enhancement, in combination with responses that increase N acquisition and increases in water use efficiency typically found at elevated CO2, may indicate that these semiarid species will be better able to cope with both nutrient and water deficits as CO2 levels rise. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00029122_v91_n4_p565_Causin
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Ammonium
CO2
Controlled environments
Nitrate
Nitrogen metabolism
Nitrogen uptake
Prosopis flexuosa
Prosopis glandulosa
carbon dioxide
growth
metabolism
nitrogen
nutrient uptake
semiarid region
shrub
Prosopis
Prosopis flexuosa
Prosopis flexuosa
Prosopis glandulosa
Prosopis glandulosa
spellingShingle Ammonium
CO2
Controlled environments
Nitrate
Nitrogen metabolism
Nitrogen uptake
Prosopis flexuosa
Prosopis glandulosa
carbon dioxide
growth
metabolism
nitrogen
nutrient uptake
semiarid region
shrub
Prosopis
Prosopis flexuosa
Prosopis flexuosa
Prosopis glandulosa
Prosopis glandulosa
Causin, H.F.
Tremmel, D.C.
Rufty, T.W.
Reynolds, J.F.
Growth, nitrogen uptake, and metabolism in two semiarid shrubs grown at ambient and elevated atmospheric CO2 concentrations: Effects of nitrogen supply and source
topic_facet Ammonium
CO2
Controlled environments
Nitrate
Nitrogen metabolism
Nitrogen uptake
Prosopis flexuosa
Prosopis glandulosa
carbon dioxide
growth
metabolism
nitrogen
nutrient uptake
semiarid region
shrub
Prosopis
Prosopis flexuosa
Prosopis flexuosa
Prosopis glandulosa
Prosopis glandulosa
description The effect of differences in nitrogen (N) availability and source on growth and nitrogen metabolism at different atmospheric CO2 concentrations in Prosopis glandulosa and Prosopis flexuosa (native to semiarid regions of North and South America, respectively) was examined. Total biomass, allocation, N uptake, and metabolites (e.g., free NO3 -, soluble proteins, organic acids) were measured in seedlings grown in controlled environment chambers for 48 d at ambient (350 ppm) and elevated (650 ppm) CO2 and fertilized with high (8.0 mmol/L) or low (0.8 mmol/L) N (N,level), supplied at either 1:1 or 3:1 NO3 -:NH4 + ratios (Nsource). Responses to elevated CO2 depended on both Nlevel and N source, with the largest effects evident at high Nlevel. A high NO3 -:NH4 + ratio stimulated growth responses to elevated CO2 in both species when N was limiting and increased the responses of P. flexuosa at high Nlevel. Significant differences in N uptake and metabolites were found between species. Seedlings of both species are highly responsive to N availability and will benefit from increases in CO2, provided that a high proportion of NO3- to NH4-N is present in the soil solution. This enhancement, in combination with responses that increase N acquisition and increases in water use efficiency typically found at elevated CO2, may indicate that these semiarid species will be better able to cope with both nutrient and water deficits as CO2 levels rise.
format JOUR
author Causin, H.F.
Tremmel, D.C.
Rufty, T.W.
Reynolds, J.F.
author_facet Causin, H.F.
Tremmel, D.C.
Rufty, T.W.
Reynolds, J.F.
author_sort Causin, H.F.
title Growth, nitrogen uptake, and metabolism in two semiarid shrubs grown at ambient and elevated atmospheric CO2 concentrations: Effects of nitrogen supply and source
title_short Growth, nitrogen uptake, and metabolism in two semiarid shrubs grown at ambient and elevated atmospheric CO2 concentrations: Effects of nitrogen supply and source
title_full Growth, nitrogen uptake, and metabolism in two semiarid shrubs grown at ambient and elevated atmospheric CO2 concentrations: Effects of nitrogen supply and source
title_fullStr Growth, nitrogen uptake, and metabolism in two semiarid shrubs grown at ambient and elevated atmospheric CO2 concentrations: Effects of nitrogen supply and source
title_full_unstemmed Growth, nitrogen uptake, and metabolism in two semiarid shrubs grown at ambient and elevated atmospheric CO2 concentrations: Effects of nitrogen supply and source
title_sort growth, nitrogen uptake, and metabolism in two semiarid shrubs grown at ambient and elevated atmospheric co2 concentrations: effects of nitrogen supply and source
url http://hdl.handle.net/20.500.12110/paper_00029122_v91_n4_p565_Causin
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