Chiral macroaggregates of LHCII detected by circularly polarized luminescence in intact pea leaves are sensitive to drought stress

Functional Plant Biology : FPB
Eugene E GussakovskyYosepha Shahak

Abstract

Circularly polarized chlorophyll luminescence (CPL) was recently shown to be an effective tool for the study of chiral macroaggregate formation of the light-harvesting chlorophyll a/b pigment-protein complexes (LHCIIs) in isolated chloroplasts. The CPL measuring system was modified to study green leaves. Spectral and intensity features of pea leaf CPL signals suggested that CPL indeed detected chiral macroaggregates. The signals were found to depend on the excitation vs emission optical alignment, as well as on the side (adaxial or abaxial) of the leaf. Illumination of attached leaves with either low intensity or strong photoinhibitory light did not affect the chiral macroaggregation status. In contrast, the induction of drought stress in detached leaves led to full disruption of the chiral macroaggregates. The disruption developed gradually during slow dehydration, whereas under fast, heat-stimulated dehydration it was manifested in cooperative diminution of both CPL and photochemical capacity. Simultaneous exposure of the leaves to photoinhibitory illumination and fast dehydration resulted in negative CPL signals. The results demonstrate the potency of CPL as a non-destructive tool for structural studies of LHCII in intact le...Continue Reading

Citations

Feb 2, 2006·Photosynthesis Research·Eugene E GussakovskyYosepha Shahak
May 7, 2009·Photosynthesis Research·Gyozo Garab, Herbert van Amerongen
Dec 6, 2011·Omics : a Journal of Integrative Biology·Katalin Magyar-TáboriJudit Dobránszki

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