title: Color of illumination during growth affects LHCII chiral macroaggregates in pea plant leaves.
abstract: To determine whether the color of illumination under which plants are grown, affects the structure of photosynthetic antennae, pea plants were grown under either blue-enriched, red-enriched, or white light. Carotenoid content of isolated chloroplasts was found to be insensitive to the color of illumination during growth, while chlorophyll a/b ratio in chloroplasts isolated from young illuminated leaves showed susceptibility to color. Color of illumination affects the LHCII chiral macroaggregates in intact leaves and isolated chloroplasts, providing light-induced alteration of the handedness of the LHCII chiral macroaggregate, as measured with circular dichroism and circularly polarized luminescence. The susceptibility of handedness to current illumination (red light excitation of chlorophyll fluorescence) is dependent on the color under which the plants were grown, and was maximal for the red-enriched illumination. We propose the existence of a long-term (growth period) color memory, which influences the susceptibility of the handedness of LHCII chiral macroaggregates to current light.
authors.affiliation: Department of Botany, University of Manitoba, 521 Buller building, Winnipeg, Manitoba, Canada R3T 2N2. gussakov@cc.umanitoba.ca
authors.forename: Eugene E
authors.initials: EE
authors.lastname: Gussakovsky
authors.forename: Yosepha
authors.initials: Y
authors.lastname: Shahak
authors.forename: Dana F
authors.initials: DF
authors.lastname: Schroeder
mesh_terms: D002449:Cell Aggregation / Q000528:radiation effects; D002734:Chlorophyll / Q000378:metabolism / Q000528:radiation effects; D002942:Circular Dichroism; D003116:Color; D003624:Darkness; D008029:Lighting / Q000379:methods*; D018532:Pisum sativum / Q000166:cytology / Q000254:growth & development* / Q000528:radiation effects; D018515:Plant Leaves / Q000166:cytology / Q000254:growth & development* / Q000528:radiation effects
chemical_list: D002734:Chlorophyll