Resolution of components of non-photochemical chlorophyll fluorescence quenching in barley leaves
- 1 February 1991
- journal article
- research article
- Published by Springer Nature in Photosynthesis Research
- Vol. 27 (2) , 121-133
- https://doi.org/10.1007/bf00033251
Abstract
Non-photochemical chlorophyll fluorescence quenching (qN) in barley leaves has been analysed by monitoring its relaxation in the dark, by applying saturating pulses of light. At least three kinetically distinct phases to qN recovery are observed, which have previously been identified (Quick and Stitt 1989) as being due to high-energy state quenching (‘fast’), excitation energy redistribution due to a state transition (‘medium’) and photoinhibition (‘slow’). However, measurements of chlorophyll fluorescence at 77 K from leaf extracts show that state transitions only occur in low light conditions, whereas the ‘medium’ component of qN is very large in high light. The source of that part of the ‘medium’ component not accounted for by a state transition is discussed.Keywords
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