| Título: | Physiology and biochemistry of leaf bleaching in prematurely aging maple (Acer saccharinum L.) trees. II. Functional and molecular adjustment of PSII. |
| Autores: |
Lepedus, Hrvoje; Agricultural Institute Osijek, Južno predgrađe 17, HR-31000 Osijek Begovic, Lidija; Department of Biology, University of J.J. Strossmayer in Osijek, Trg Lj. Gaja 6, HR-31000 Osijek Mlinaric, Selma; Department of Biology, University of J.J. Strossmayer in Osijek, Trg Lj. Gaja 6, HR-31000 Osijek Simic, Domagoj; Agricultural Institute Osijek, Južno predgrađe 17, HR-31000 Osijek Uzarevic, Zvonimir; Faculty of Education, University of J.J. Strossmayer in Osijek, L. Jägera 9, HR-31000 Osijek Stolfa, Ivna; Department of Biology, University of J.J. Strossmayer in Osijek, Trg Lj. Gaja 6, HR-31000 Osijek Paradikovic, Nada; Faculty of Agriculture, University of J. J. Strossmayer in Osijek, Trg Sv. Trojstva 3, HR-31000 Osijek, Croatia Jurkovic, Vlatka; Agricultural Institute Osijek, Južno predgrađe 17, HR-31000 Osijek Cesar, Vera; Department of Biology, University of J.J. Strossmayer in Osijek, Trg Lj. Gaja 6, HR-31000 Osijek |
| Fecha: | 2011-10-05 |
| Publicador: | Acta Botánica Croática |
| Fuente: |
 |
| Tipo: |
Peer-reviewed Article |
| Tema: | Silver maple, photosynthesis, premature aging, chlorophyll fluorescence |
| Descripción: | 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 measurementto 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 elemental composition of the leaves. Decreases in Al, Cr, Cu, Fe, K, Zn and an increase in S concentrations were found in bleached leaves in comparison to healthy green ones. The bleached leaves were visually expressing symptoms characteristic of Fe deficiency. Further, they had considerably decreased chlorophyll contents andprotochlorophyllide contents, overall photosynthetic activity and relative abundance of major photosynthetic proteins. All the results indicate that modifications in the molecular organization of photosynthetic electron-transport chain components in bleached leaves led to functional adaptation of the PSII achieved by modifications of some reaction centres (RCs), turning them from active to dissipative. This provided efficient adaptation of bleached leaves to high-light induced oxidative damage during summer. |
| Idioma: | Inglés |
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