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Thylakoid system disassembly during bleaching of aurea mutants of maple Acer negundo Hassk. var. Odessanum

Fulgosi, Hrvoje; Jurić, Snježana; Lepeduš, Hrvoje; Hazler-Pilepić, Kroata; Prebeg, Tatjana; Ljubešić, Nikola (2008) Thylakoid system disassembly during bleaching of aurea mutants of maple Acer negundo Hassk. var. Odessanum. Croatica Chemica Acta, 81 (1). pp. 89-95. ISSN 0011-1643

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Abstract

Biogenesis of chloroplast photosynthetic membranes is a still not very well understood series of molecular events. Apart from performing photosynthesis reactions, these specialized bio-membranes possess the ability of rearrangement to adapt to the ever-changing light environment. In this work, urea mutants of wild-growing maple trees were used to study events that lead to damage and disassembly of thylakoid membranes during the vegetation season. Plastid ultrastructural changes, changes in the composition of photosynthetic pigments and proteins, as well as the efficiency of photosystem II were monitored. It was concluded that strong photo-inhibitory processes, coupled with the degradation of proteins, are responsible for the relatively fast reduction of photosynthetic membranes in aurea-type chloroplasts. It is evident that lipid constituents of thylakoid membranes are less susceptible to degradation processes. Once severely damaged, photosynthetic membranes of aurea-type leaves are no longer able to reconstitute the intertwined and functionally intact internal membrane system.

Item Type: Article
Uncontrolled Keywords: carotenoids; light harvesting complex; photoinhibition; pulse amplitude modulated; fluorimetry; photosystem-ii; light; protein; tobacco; chloroplasts; biogenesis; membranes; nuclear; leaves; chlorophyll
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division of Molecular Biology
Projects:
Project titleProject leaderProject codeProject type
Regulatorni mehanizmi fotosinteze i diferencijacija plastida[186771] Hrvoje Fulgosi098-0982913-2838MZOS
Utjecaj oksidativnog stresa na organizaciju i funkciju biljnih stanica i tkiva[221446] Hrvoje Lepeduš073-0731674-1673MZOS
Depositing User: Hrvoje Fulgosi
Date Deposited: 25 Oct 2013 10:54
Last Modified: 14 Feb 2014 15:02
URI: http://fulir.irb.hr/id/eprint/840

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