title: Kinetics of excitation trapping in intact Photosystem I of Chlamydomonas reinhardtii and Arabidopsis thaliana.
abstract: We measured picosecond time-resolved fluorescence of intact Photosystem I complexes from Chlamydomonas reinhardtii and Arabidopsis thaliana. The antenna system of C. reinhardtii contains about 30-60 chlorophylls more than that of A. thaliana, but lacks the so-called red chlorophylls, chlorophylls that absorb at longer wavelength than the primary electron donor. In C. reinhardtii, the main lifetimes of excitation trapping are about 27 and 68 ps. The overall lifetime of C. reinhardtii is considerably shorter than in A. thaliana. We conclude that the amount and energies of the red chlorophylls have a larger effect on excitation trapping time in Photosystem I than the antenna size.
authors.affiliation: Faculty of Sciences, Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, the Netherlands. janihal@nat.vu.nl
authors.forename: Janne A
authors.initials: JA
authors.lastname: Ihalainen
authors.forename: Ivo H M
authors.initials: IH
authors.lastname: van Stokkum
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Gibasiewicz
authors.forename: Marta
authors.initials: M
authors.lastname: Germano
authors.forename: Rienk
authors.initials: R
authors.lastname: van Grondelle
authors.forename: Jan P
authors.initials: JP
authors.lastname: Dekker
mesh_terms: D000818:Animals; D017360:Arabidopsis / Q000378:metabolism*; D016825:Chlamydomonas reinhardtii / Q000378:metabolism*; D005453:Fluorescence; D007700:Kinetics; D045331:Photosystem I Protein Complex / Q000378:metabolism*
chemical_list: D045331:Photosystem I Protein Complex