Growth and photosynthetic responses to copper stress of an invasive cordgrass, Spartina densiflora
Spartina densiflora Brongn. is found in coastal marshes of south-west Spain, growing in sediments with between 300 and 3000 mg Cu kg-1 total soil DW (450-4500 mg Cu kg-1 supposing that the soil porosity is 0.5). An experiment was designed to investigate the effect of copper from 0 to 5000 mg kg-1 (6...
| Autores: | , , , |
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| Formato: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2008 |
| País: | España |
| Recursos: | Universidad de Sevilla (US) |
| Repositorio: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/147606 |
| Acesso em linha: | https://hdl.handle.net/11441/147606 https://doi.org/10.1016/j.marenvres.2008.07.007 |
| Access Level: | acceso abierto |
| Palavra-chave: | Copper Growth rate Invader Photochemistry Photosynthesis Photosynthetic pigments Salt marshes Spartina densiflora Tissue analysis |
| Resumo: | Spartina densiflora Brongn. is found in coastal marshes of south-west Spain, growing in sediments with between 300 and 3000 mg Cu kg-1 total soil DW (450-4500 mg Cu kg-1 supposing that the soil porosity is 0.5). An experiment was designed to investigate the effect of copper from 0 to 5000 mg kg-1 (64 mmol l-1) on the photosynthetic apparatus and the growth of S. densiflora. We also determined total ash, copper, calcium, magnesium and phosphorous concentrations, as well as C/N ratio. S. densiflora survived to concentrations as high as 320 mg Cu kg-1 DW in leaves, although excess of Cu diminished water use efficiency and Ca-, Mg- and P-uptake. Also, quantum efficiency of PSII, net photosynthetic rate, stomatal conductance and pigment concentrations declined with increasing external Cu. Finally, the decline in the photosynthetic function resulted in a biomass reduction of between 50 and 80% (for 600 and 5000 mg Cu kg-1, respectively). |
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