Skip to main content
Log in

Simultaneously measuring pulse-amplitude-modulated (PAM) chlorophyll fluorescence of leaves at wavelengths shorter and longer than 700 nm

  • Technical communication
  • Published:
Photosynthesis Research Aims and scope Submit manuscript

Abstract

PAM fluorescence of leaves of cherry laurel (Prunus laurocerasus L.) was measured simultaneously in the spectral range below 700 nm (sw) and above 700 nm (lw). A high-sensitivity photodiode was employed to measure the low intensities of sw fluorescence. Photosystem II (PSII) performance was analyzed by the saturation pulse method during a light response curve with subsequent dark phase. The sw fluorescence was more variable, resulting in higher PSII photochemical yields compared to lw fluorescence. The variations between sw and lw data were explained by different levels of photosystem I (PSI) fluorescence: the contribution of PSI fluorescence to minimum fluorescence (F0) was calculated to be 14% at sw wavelengths and 45% at lw wavelengths. With the results obtained, the validity of an earlier method for the quantification of PSI fluorescence (Genty et al. in Photosynth Res 26:133–139, 1990, https://doi.org/10.1007/BF00047085) was reconsidered. After subtracting PSI fluorescence from all fluorescence levels, the maximum PSII photochemical yield (FV/FM) in the sw range was 0.862 and it was 0.883 in the lw range. The lower FV/FM at sw wavelengths was suggested to arise from inactive PSII reaction centers in the outermost leaf layers. Polyphasic fluorescence transients (OJIP or OI1I2P kinetics) were recorded simultaneously at sw and lw wavelengths: the slowest phase of the kinetics (IP or I2P) corresponded to 11% and 13% of total variable sw and lw fluorescence, respectively. The idea that this difference is due to variable PSI fluorescence is critically discussed. Potential future applications of simultaneously recording fluorescence in two spectral windows include studies of PSI non-photochemical quenching and state I–state II transitions, as well as measuring the fluorescence from pH-sensitive dyes simultaneously with chlorophyll fluorescence.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6

Availability of data and materials

Original data will be provided on request.

Abbreviations

sw:

Short wavelength range (< 700 nm)

lw:

Long wavelength range (> 700 nm)

References

Download references

Acknowledgements

The outstanding technical support by Frank Reichel and Thomas Simon is greatly acknowledged. I thank Todd Kana for proofreading. Specials thanks go to Gert Schansker for fruitful discussions and essential support during the preparation of this paper. I am particularly grateful to Christof Klughammer for implementing the new fluorescence option in the DualPAM software.

Funding

Does not apply.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Erhard E. Pfündel.

Ethics declarations

Conflict of interest

The author states that there is no conflict of interest.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Supplementary Information

Below is the link to the electronic supplementary material.

Supplementary file1 (PDF 285 KB)

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Pfündel, E.E. Simultaneously measuring pulse-amplitude-modulated (PAM) chlorophyll fluorescence of leaves at wavelengths shorter and longer than 700 nm. Photosynth Res 147, 345–358 (2021). https://doi.org/10.1007/s11120-021-00821-7

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11120-021-00821-7

Keywords

Navigation