title: Adaptation of photosystem II to high and low light in wild-type and triazine-resistant Canola plants: analysis by a fluorescence induction algorithm.
abstract: Plants of wild-type and triazine-resistant Canola (Brassica napus L.) were exposed to very high light intensities and after 1 day placed on a laboratory table at low light to recover, to study the kinetics of variable fluorescence after light, and after dark-adaptation. This cycle was repeated several times. The fast OJIP fluorescence rise curve was measured immediately after light exposure and after recovery during 1 day in laboratory room light. A fluorescence induction algorithm has been used for resolution and analysis of these curves. This algorithm includes photochemical and photo-electrochemical quenching release components and a photo-electrical dependent IP-component. The analysis revealed a substantial suppression of the photo-electrochemical component (even complete in the resistant biotype), a partial suppression of the photochemical component and a decrease in the fluorescence parameter F (o) after high light. These effects were recovered after 1 day in the indoor light.
authors.affiliation: Laboratory of Plant Physiology, Wageningen University and Research Center, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands. Jack.vanRensen@wur.nl
authors.forename: Jack J S
authors.initials: JJ
authors.lastname: van Rensen
authors.forename: Wim J
authors.initials: WJ
authors.lastname: Vredenberg
mesh_terms: D000222:Adaptation, Physiological / Q000187:drug effects / Q000528:radiation effects*; D000465:Algorithms; D029688:Brassica napus / Q000187:drug effects / Q000502:physiology* / Q000528:radiation effects*; D005453:Fluorescence; D053209:Herbicide Resistance / Q000528:radiation effects*; D007700:Kinetics; D045332:Photosystem II Protein Complex / Q000378:metabolism*; D018515:Plant Leaves / Q000187:drug effects / Q000528:radiation effects; D013997:Time Factors; D014227:Triazines / Q000494:pharmacology*
chemical_list: D045332:Photosystem II Protein Complex; D014227:Triazines