Data/hora: 11/06/2024 03:17:41

Provedor de dados: | 5
País: | France
Título: | Seasonal and plant-part isotopic and biochemical variation in Posidonia oceanica
Autores: | Cresson, Pierre; Boudouresque, Charles François; Ruitton, Sandrine; Casalot, Laurie; Verlaque, Marc; Harmelin-vivien, Mireille.
Data: | 2019
Ano: | 2019
Palavras-chave: | Posidomia oceanica; Mediterranean Sea; Stable isotopes; Biochemical composition.
Resumo: | Posidonia oceanica is an iconic and highly productive Mediterranean seagrass. As most studies have focused on the fate of its production, temporal and plant part-specific variations of isotopic composition and biochemical content were overlooked. Combined seasonal and plant-part stable isotope composition and biochemical concentrations were measured at the lower depth limit of a P. oceanica meadow (~ 25 meter depth), and explained on the basis of previous knowledge of the specific metabolic functioning of each part. The predominance of compounds with complex chemical structure was reflected by the high concentrations of insoluble carbohydrates, high C/N ratios and high ä13C values. Plant parts clustered in 3 groups with similar isotopic or biochemical features and metabolism: rhizomes and juvenile leaves, intermediate and adult leaves, senescent and drifting leaves. This result agrees with the vegetative phenology of the plant. The biochemical composition and the isotopic composition of the plant parts were consistent with previous knowledge regarding the photosynthetic activity and its seasonal variation. Correlations were found between N-linked descriptors (ä15N and protein content), and between ä13C and insoluble carbohydrate concentration. Epibiont values differed considerably from those of the leaf, as this community is taxonomically diverse and seasonally variable. Biochemical and isotopic composition measured confirmed that the current complex metabolism of P. oceanica results from adaptations to the specific features of life in a marine oligotrophic environment.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00505/61640/65566.pdf

https://archimer.ifremer.fr/doc/00505/61640/65567.pdf

DOI:10.12681/mms.18660

https://archimer.ifremer.fr/doc/00505/61640/

Editor: | National Documentation Centre
Formato: | application/pdf
Fonte: | Mediterranean Marine Science (1108-393X) (National Documentation Centre), 2019 , Vol. 20 , N. 2 , P. 357-372

Fonte:

info:eu-repo/semantics/openAccess

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