Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/46475
Título: Endogenous polyamine content and photosynthetic performance under hypo-osmotic conditions reveal Cymodocea nodosa as an obligate halophyte
Autores/as: Zarranz Elso, M.
García-Jiménez, P. 
Robaina, R. R. 
Clasificación UNESCO: 251004 Botánica marina
Palabras clave: Cymodocea nodosa
Fluorescence
Obligate halophyte
Polyamines
Hypo-salinity, et al.
Fecha de publicación: 2012
Editor/a: 1864-7782
Publicación seriada: Aquatic Biology 
Resumen: Endogenous polyamine (PA) content in the seagrass Cymodocea nodosa was monitored at different embryo and seedling developmental stages. Total PA concentration, including putrescine (Put), spermidine (Spd) and spermine (Spm), and the Put (Spm + Spd)−1 ratio decreased during embryo development, from the immature fruit to the mature seed stage (with a sharp decline in the free PA fraction), and subsequently increased during germination and seedling development from the cotyledon to seedling stage, indicating an important role during zygotic embryogenesis and seed germination. In particular, total levels of Put and Spm significantly decreased from the fruit to the mature seed, to be restored after germination. Spd levels remained constant during all the developmental stages studied. When seedlings were subjected to hypoosmotic stress (i.e. salinity decrease from 36 to 5 psu), fluorescence levels decreased, reaching a minimum photochemical efficiency (Fv/Fm) at 5 psu (0.582 ± 0.025, mean ± SE), indicating that seedlings were under high stress. Contrary to expectations, this was followed by a slight decrease in total PA content (showing a significance difference between 5 psu and higher salinities in bound-insoluble PA) and the accumulation of the PA cadaverine (Cad) at 5 psu (indicating cell death), which revealed the inability of this species to face the abiotic stress promoted by long-term salinity decrease. These 2 physiological indicators may suggest that C. nodosa is an obligate halophyte because it requires an environment with relatively high and stable salinity for its survival. Moreover, exogenous application of Spd significantly improved Fv/Fm values at the lowest salinity treatment (5 psu: 0.670 ± 0.012), which suggests a protective role of Spd in maintaining the photosynthetic apparatus of C. nodosa seedlings under long-term hypo-osmotic stress
URI: http://hdl.handle.net/10553/46475
ISSN: 1864-7782
DOI: 10.3354/ab00454
Fuente: Aquatic Biology [ISSN 1864-7782], v. 17, p. 7-17
Colección:Artículos
miniatura
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