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

PDF - Published Version Download (227kB)

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 title Project leader Project code Project type Regulatorni mehanizmi fotosinteze i diferencijacija plastida [186771] Hrvoje Fulgosi 098-0982913-2838 MZOS Utjecaj oksidativnog stresa na organizaciju i funkciju biljnih stanica i tkiva [221446] Hrvoje Lepeduš 073-0731674-1673 MZOS
Depositing User:	Hrvoje Fulgosi
Date Deposited:	25 Oct 2013 10:54
URI:	http://fulir.irb.hr/id/eprint/840

Actions (login required)

View Item