Naslov
Depth-related variation of biochemical markers in Posidonia oceanica at the Eastern coast of the Adriatic Sea

Autori
Tkalec, Mirta ; Vidaković-Cifrek, Željka ; Pevalek-Kozlina, Branka ; Bakran-Petricioli, Tatjana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Physiologia Plantarum 133 / Vaughan, Hurry - Oxford : Wiley-Blackwell, 2008

Skup
XVI Congress of the Federation of European Societies of Plant Biology (FESPB)

Mjesto i datum
Tampere, Finska, 17.08.2008. - 22.08.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Posidonia oceanica; biochemical markers; biomonitoring

Sažetak
Posidonia oceanica (L.) Delile is an endemic Mediterranean seagrass that forms vast meadows from the sea surface down to depths of more than 30 meters. Recently, many P. oceanica beds are declining due to both natural and anthropogenic disturbances. Because of its wide distribution, sedentary habit, abundance and sensitivity to ecological modifications meadows of P. oceanica have been recommended for biomonitoring in the Mediterranean Sea. In this study lipid peroxidation and free amino acid content as well as the activity and isoenzyme pattern of peroxidases were investigated in the extracts of Posidonia leaves collected from different depths (5, 15, 20 and 32 m) in an unpolluted site near Lastovo Island in order to find out possible variations of the basic levels of stress biomarkers. In general, sheaths (photosynthetically inactive) had higher levels of MDA and free amino acids than blades (photosynthetically active). With the increasing sea depth MDA content decreased in both blades and sheaths while free amino acids increased. The activity of peroxidases was higher in the blades than in the sheaths although native electrophoresis revealed a common isoenzyme pattern. In both blades and sheaths the highest peroxidase activity was measured in P. oceanica living at 15 m while the lowest was in plants from 32 m. Our results showed depth-related variation in the levels of biochemical markers in Posidonia oceanica which should be taken into account in the future biomonitoring.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA