title: Higher concentration of Q(B)-nonreducing photosystem II centers in triazine-resistant Chenopodium album plants as revealed by analysis of chlorophyll fluorescence kinetics.
abstract: Plants resistant to triazine-type herbicides are known to be altered in their photosystem II reaction center. Serine at site 264 in D1 protein is replaced by glycine. The measurements of chlorophyll a fluorescence excitations with a variable number of saturating flashes in Chenopodium album plants show characteristic differences between the resistant and the wild-type plants. These differences appear in response to the first flash as well as in the rise pattern of subsequent flashes of a 12.5 Hz flash train. The differences indicate a higher concentration of Q(B)-nonreducing reaction centers in the resistant biotype, and confirm earlier results on a slower rate of electron transport between the primary and secondary electron acceptors.
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: D027463:Chenopodium album / Q000378:metabolism*; D002734:Chlorophyll / Q000378:metabolism*; D000077194:Chlorophyll A; D005453:Fluorescence; D005470:Fluorometry; D053209:Herbicide Resistance; D007700:Kinetics; D045332:Photosystem II Protein Complex / Q000378:metabolism*; D018515:Plant Leaves / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism*; D014227:Triazines / Q000494:pharmacology*
chemical_list: D045332:Photosystem II Protein Complex; D010940:Plant Proteins; D014227:Triazines; D002734:Chlorophyll; D000077194:Chlorophyll A