ibclogo XVI International Botanical Congess


Abstract Number: 4934
Session = 3.18.4


GENE EXPRESSION AND THE REGULATION OF THE ASCORBATE-GLUTATHIONE CYCLE: PROSPECTS FOR GENETIC MANIPULATION


P. Mullineaux*, H. Reynolds*, B. Karpinska^, G. Wingsle^, G. Creissen* and S. Karpinski^ *John Innes Centre, Norwich, UK. ^Swedish University of Agricultural Sciences, Umeå, Sweden


Plants dissipate excess excitation energy (EEE) as heat. But if conditions which promote EEE persist this leads to increased production of active oxygen species (AOS). If AOS accumulation is not removed by the plant's antioxidant defences, including the ascorbate-glutathione (A-G) cycle, then oxidative stress ensues. Partial exposure of low-light grown Arabidopsis plants to high light leads to rapid acclimation to EEE and oxidative stress in non-exposed leaves. Redox events in photosystem II, hydrogen peroxide and induction of AG cycle genes are determinants of this mechanism called systemic aquired acclimation (SAA). How SAA might be manipulated will be considered.


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