title: Chlorophyll fluorescence transients in a barley mutant lacking Photosystem I.
abstract: We have compared the properties of a mutant of barley lacking Photosystem I (viridis-zb (63) ) with the corresponding wild type using modulated fluorescence measurements. The mutant showed two unexpected characteristics. Firstly, there was a slow decline in the fluorescence signal in the light which was dependent on the presence of O2 at concentrations similar to that in air; 2% O2 in N2 had no effect. The observed decline was mainly due to an increase in the non-photochemical quenching. Secondly, in the absence of O2, saturating light pulses caused a pronounced transient decrease in the fluorescence signal; a similar effect could also be observed in wild type plants when neither CO2 nor O2 was present.
authors: Institute of Biochemistry, Odense University, Campusvej 55, DK 5230, Odense M, Denmark.
authors: R K
authors: RK
authors: Juhler
authors: M
authors: M
authors: Miller
authors: D
authors: D
authors: Simpson
authors: R P
authors: RP
authors: Cox