NDLI: Continuous ECS-indicated recording of the proton-motive charge flux in leaves

Content Provider	Springer Nature Link
Author	Klughammer, Christof Siebke, Katharina Schreiber, Ulrich
Copyright Year	2013
Abstract	Technical features and examples of application of a special emitter–detector module for highly sensitive measurements of the electrochromic pigment absorbance shift (ECS) via dual-wavelength (550–520 nm) transmittance changes (P515) are described. This device, which has been introduced as an accessory of the standard, commercially available Dual-PAM-100 measuring system, not only allows steady-state assessment of the proton motive force (pmf) and its partitioning into ΔpH and ΔΨ components, but also continuous recording of the overall charge flux driven by photosynthetic light reactions. The new approach employs a double-modulation technique to derive a continuous signal from the light/dark modulation amplitude of the P515 signal. This new, continuously measured signal primarily reflects the rate of proton efflux via the ATP synthase, which under quasi-stationary conditions corresponds to the overall rate of proton influx driven by coupled electron transport. Simultaneous measurements of charge flux and CO$_{2}$ uptake as a function of light intensity indicated a close to linear relationship in the light-limited range. A linear relationship between these two signals was also found for different internal CO$_{2}$ concentrations, except for very low CO$_{2}$, where the rate of charge flux distinctly exceeded the rate of CO$_{2}$ uptake. Parallel oscillations in CO$_{2}$ uptake and charge flux were induced by high CO$_{2}$ and O$_{2}$. The new device may contribute to the elucidation of complex regulatory mechanisms in intact leaves.
Starting Page	471
Ending Page	487
Page Count	17
File Format	PDF
ISSN	01668595
Journal	Photosynthesis Research
Volume Number	117
Issue Number	1-3
e-ISSN	15735079
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-07-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CO$_{2}$ gas exchange DIRK method Dual-PAM-100 Electrochromic absorbance shift Photosynthetic electron transport P515 Plant Sciences Plant Physiology Biochemistry Plant Genetics & Genomics
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine Biochemistry

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