Journal
PLANT CELL AND ENVIRONMENT
Volume 40, Issue 8, Pages 1243-1255Publisher
WILEY
DOI: 10.1111/pce.12924
Keywords
chlorophyll fluorescence; electron transport; non-photochemical quenching; photosynthesis; spectroscopy
Categories
Funding
- US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-FG02-91ER20021]
- MSU Center for Advanced Algal and Plant Phenotyping (CAAPP)
Ask authors/readers for more resources
In photosynthesis, light energy is absorbed by light-harvesting complexes and used to drive photochemistry. However, a fraction of absorbed light is lost to non-photochemical quenching (NPQ) that reflects several important photosynthetic processes to dissipate excess energy. Currently, estimates of NPQ and its individual components (q(E), q(I), q(Z) and q(T)) are measured from pulse-amplitude-modulation (PAM) measurements of chlorophyll fluorescence yield and require measurements of the maximal yield of fluorescence in fully dark-adapted material (F-m), when NPQ is assumed to be negligible. Unfortunately, this approach requires extensive dark acclimation, often precluding widespread or high-throughput use, particularly under field conditions or in imaging applications, while introducing artefacts when F-m is measured in the presence of residual photodamaged centres. To address these limitations, we derived and characterized a new set of parameters, NPQ((T)), and its components that can be (1) measured in a few seconds, allowing for high-throughput and field applications; (2) does not require full relaxation of quenching processes and thus can be applied to photoinhibited materials; (3) can distinguish between NPQ and chloroplast movements; and (4) can be used to image NPQ in plants with large leaf movements. We discuss the applications benefits and caveats of both approaches.
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