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1.
New Phytol ; 179(1): 129-141, 2008.
Artigo em Inglês | MEDLINE | ID: mdl-18422899

RESUMO

The adaptive responses to atmospheric nitrogen deposition for different European accessions of Arabidopsis lyrata petraea were analysed using populations along a strong atmospheric N-deposition gradient. Plants were exposed to three N-deposition rates, reflecting the rates at the different locations, in a full factorial design. Differences between accessions in the response to N were found for important phenological and physiological response variables. For example, plants from low-deposition areas had higher nitrogen-use efficiencies (NUE) and C : N ratios than plants from areas high in N deposition when grown at low N-deposition rates. The NUE decreased in all accessions at higher experimental deposition rates. However, plants from high-deposition areas showed a limited capacity to increase their NUE at lower experimental deposition rates. Plants from low-deposition areas had faster growth rates, higher leaf turnover rates and shorter times to flowering, and showed a greater increase in growth rate in response to N deposition than those from high-deposition areas. Indications for adaptation to N deposition were found, and results suggest that adaptation of plants from areas high in N deposition to increased N deposition has resulted in the loss of plasticity.


Assuntos
Poluentes Atmosféricos/metabolismo , Arabidopsis/efeitos dos fármacos , Geografia , Nitrogênio/farmacologia , Adaptação Fisiológica , Arabidopsis/crescimento & desenvolvimento , Arabidopsis/metabolismo , Biomassa , Monitoramento Ambiental , Islândia , Nitrogênio/metabolismo , Noruega , Folhas de Planta/efeitos dos fármacos , Folhas de Planta/crescimento & desenvolvimento , Folhas de Planta/metabolismo , Solo , Reino Unido
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