Journal
NEW PHYTOLOGIST
Volume 215, Issue 4, Pages 1594-1608Publisher
WILEY
DOI: 10.1111/nph.14662
Keywords
Chl fluorescence; fluorescence spectra; gross primary production; leaf level; photosynthesis; pulse-amplitude modulation (PAM); remote sensing; solar induced Chl fluorescence (SIF)
Categories
Funding
- NASA Postdoctoral Program fellowship award
- California Institute of Technology startup funds
- Keck Institute for Space Studies
- National Aeronautics and Space Administration
- California Institute of Technology
Ask authors/readers for more resources
Recent advances in the retrieval of Chl fluorescence from space using passive methods (solar- induced Chl fluorescence, SIF) promise improved mapping of plant photosynthesis globally. However, unresolved issues related to the spatial, spectral, and temporal dynamics of vegetation fluorescence complicate our ability to interpret SIF measurements. We developed an instrument to measure leaf-level gas exchange simultaneously with pulse-amplitude modulation (PAM) and spectrally resolved fluorescence over the same field of view - allowing us to investigate the relationships between active and passive fluorescence with photosynthesis. Strongly correlated, slope-dependent relationships were observed between measured spectra across all wavelengths (Fk, 670-850 nm) and PAM fluorescence parameters under a range of actinic light intensities (steady-state fluorescence yields, Ft) and saturation pulses (maximal fluorescence yields, Fm). Our results suggest that this method can accurately reproduce the full Chl emission spectra - capturing the spectral dynamics associated with changes in the yields of fluorescence, photochemical (FPSII), and nonphotochemical quenching (NPQ). We discuss how this method may establish a link between photosynthetic capacity and the mechanistic drivers of wavelength-specific fluorescence emission during changes in environmental conditions (light, temperature, humidity). Our emphasis is on future research directions linking spectral fluorescence to photosynthesis, FPSII, and NPQ.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available