Physiology and biochemistry of leaves bleaching in prematurely aging maple (Acer saccharinum L.) trees: II. Functional and molecular adjustment of PSII (CROSBI ID 162209)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Lepeduš, Hrvoje ; Begović, Lidija ; Mlinarić, Selma ; Šimić, Domagoj ; Štolfa, Ivna ; Parađiković, Nada ; Užarević, Zvonimir ; Jurković, Vlatka ; Cesar, Vera
engleski
Physiology and biochemistry of leaves bleaching in prematurely aging maple (Acer saccharinum L.) trees: II. Functional and molecular adjustment of PSII
In the present study we aimed to investigate physiological and molecular mechanisms of photosynthetic performance decline in prematurely aged bleached leaves of silver maple (Acer saccharinum L.) trees. We used in vivo chlorophyll a fluorescence measurement to analyze changes in PSII photochemistry, relative abundance of photosynthetic proteins (D1, LHCII, Cytf and Rubisco LSU), relations between chlorophylls and their precursor protochlorophyllide as well as leaves elemental composition. Decrease in Al, Cr, Cu, Fe, K, Zn and increase in S concentrations were found in bleached leaves in comparison to healthy green ones. Visually, bleached leaves were expressing symptoms characteristically for Fe deficiency. Further, they had considerably decreased chlorophylls and protochlorophyllide contents, overall photosynthetic activity and relative abundance of major photosynthetic proteins. All obtained results indicate that modifications in molecular organization of photosynthetic electron-transport chain components in bleached leaves led to functional adaptation of the PSII achieved by modifications of a certain fraction of reaction centres (RCs) from active to dissipative ones. This provided efficient protective strategy in bleached leaves against high-light induced oxidative damage during summer. Key words: Silver maple, photosynthesis, premature aging, chlorophyll fluorescence
silver maple ; photosynthesis ; premature aging ; chlorophyll fluorescence
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Podaci o izdanju
70 (2)
2011.
137-150
objavljeno
0365-0588
1847-8476
10.2478/v10184-010-0010-9
Povezanost rada
Biologija, Poljoprivreda (agronomija), Biotehnologija