NDLI: A model for describing the light response of the nonphotochemical quenching of chlorophyll fluorescence

Content Provider	Springer Nature Link
Author	Serôdio, João Lavaud, Johann
Copyright Year	2011
Abstract	The operation of photosynthetic energy-dissipating processes is commonly characterized by measuring the light response of the nonphotochemical quenching (NPQ) of chlorophyll fluorescence, or NPQ versus E curves. This study proposes a mathematical model for the quantitative description of the generic NPQ versus E curve. The model is an adaptation of the Hill equation and is based on the close dependence of NPQ on the xanthophyll cycle (XC). The model was tested on NPQ versus E curves measured in the plant Arabidopsis thaliana and the diatom Nitzschia palea, representing the two main types of XC, the violaxanthin–antheraxanthin–zeaxanthin (VAZ) type and the diadinoxanthin–diatoxanthin (DD–DT) type, respectively. The model was also fitted to a large number of published light curves, covering the widest possible range of XC types, taxa, growth conditions, and experimental protocol of curve generation. The model provided a very good fit to experimental and published data, coping with the large variability in curve characteristics. The model was further used to quantitatively compare the light responses of NPQ and of PSII electron transport rate, ETR, through the use of indices combining parameters of the models describing the two types of light–response curves. Their application to experimental and published data showed a systematic large delay of the buildup of NPQ relatively to the saturation of photochemistry. It was found that when ETR reaches saturation, NPQ is on average still below one fifth of its maximum attainable level, which is only reached at irradiances about three times higher. It was also found that organisms having the DD–DT type of XC appeared to be able to start operating the XC at lower irradiances than those of the VAZ type.
Starting Page	61
Ending Page	76
Page Count	16
File Format	PDF
ISSN	01668595
Journal	Photosynthesis Research
Volume Number	108
Issue Number	1
e-ISSN	15735079
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-04-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Genetics & Genomics Plant Physiology Biochemistry Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine Biochemistry

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