Parameterization of photosystem II photoinactivation and repair

• Published in: Biochimica et biophysica acta Vol. 1817; no. 1; pp. 258 - 265
• Main Authors: Campbell, Douglas A., Tyystjärvi, Esa
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 2012
• Subjects: autotrophs; ecophysiology; Light; mechanistic models; Modeling; Models, Theoretical; Photoinhibition; photosystem II; Photosystem II Protein Complex - antagonists & inhibitors; Photosystem II Protein Complex - metabolism; Phytoplankton; Quantum yield; Rate constant; Target size; terminology; vascular plants; Target size; k DEG; σ i; N t; Chl; PSII; k REC; J a; Quantum yield; Modeling; NPQ; F M; J i; k DARK; σ PSII; k SYNTH; F 0; Photoinhibition; Phytoplankton; Φ PI; Rate constant; [A] 0 and [A ∞]; F V; k PI
• ISSN: 0005-2728; 0006-3002; 1879-2650
• DOI: 10.1016/j.bbabio.2011.04.010

The photoinactivation (also termed photoinhibition or photodamage) of Photosystem II (PSII) and the counteracting repair reactions are fundamental elements of the metabolism and ecophysiology of oxygenic photoautotrophs. Differences in the quantification, parameterization and terminology of Photosystem II photoinactivation and repair can erect barriers to understanding, and particular parameterizations are sometimes incorrectly associated with particular mechanistic models. These issues lead to problems for ecophysiologists seeking robust methods to include photoinhibition in ecological models. We present a comparative analysis of terms and parameterizations applied to photoinactivation and repair of Photosystem II. In particular, we show that the target size and quantum yield approaches are interconvertible generalizations of the rate constant of photoinactivation across a range of incident light levels. Our particular emphasis is on phytoplankton, although we draw upon the literature from vascular plants. This article is part of a Special Issue entitled: Photosystem II. ► The quantum yield and target size concepts of photoinhibition are interconvertible. ► Both quantum yield and target size can be derivedfrom the concept of rate constant. ► Target size is particularly well suited for phytoplankton.