Cu/Zn superoxide dismutase and catalase activities in Pinus mugo needles growing at elevated stands in the mountains, and their photochemical efficiency of PSII.
J Plant Physiol
; 162(8): 895-902, 2005 Aug.
Article
de En
| MEDLINE
| ID: mdl-16146315
ABSTRACT
Pinus mugo needles were sampled at different altitudes (1420, 1590 and 1920 m a.s.l.) to analyse levels of oxidative stress and changes in maximum photochemical efficiency of PSII. Polyacrylamide gel electrophoresis demonstrated that almost all superoxide dismutase activity represented Cu/Zn superoxide dismutase, and only 4-6% represents Mn superoxide dismutase. In extracts from plants sampled at 1590 and 1920 m a.s.l., lower activity of Cu/Zn superoxide dismutase was found. Comparing these data with immunoblots, it can be concluded that the differences in superoxide dismutase activity was related to protein amount. In needles from higher altitudes, a decrease in catalase activity was detected, as opposed to the protein amount, which was higher in needles from the higher stands. Considering the decrease in catalase and Cu/Zn superoxide dismutase activities in needles collected at 1590 and 1920 m a.s.l., we suggest that higher levels of oxidative stress may induce changes in photochemical efficiency of PSII.
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Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Superoxide dismutase
/
Catalase
/
Pinus
/
Complexe protéique du photosystème II
/
Altitude
Langue:
En
Journal:
J Plant Physiol
Sujet du journal:
BOTANICA
Année:
2005
Type de document:
Article
Pays d'affiliation:
Pologne