The NPQ(T) Parameter

Measuring non-photochemical quenching in a few seconds without an initial long dark acclimation.

Over the past 3 years, many MultispeQ users have noticed that the NPQ(T) parameter (and ΦNPQ) can be a powerful predictor of plant stress, either biotic or abiotic. The NPQ(T) parameter has also correlated with crop yields in some PhotosynQ projects, like this project from Malawi.

Indeed, one of the big breakthroughs with the MultispeQ is the ability to estimate NPQ (Non-Photochemical Quenching) without a long dark acclimation period, which allows us to develop robust protocols that take less than 20 seconds. So how is the NPQ(T) parameter derived and how does it compare to the established NPQ parameter?

Tietz et al. out of the Kramer Lab have just published a paper in Plant, Cell and Environment describing the parameter and its derivation. Congratulations!

Read the peer reviewed publication or the story on the Michigan State University’s Plant Research Laboratories Website, Protecting plants from the power of sunlight.

Tietz, S., Hall, C. C., Cruz, J. A., Kramer, D. M. (2017) NPQ(T): a chlorophyll fluorescence parameter for rapid estimation and imaging of non-photochemical quenching of excitons in photosystem-II-associated antenna complexes Plant. Cell Environ. 40(8), 1243–1255. doi:10.1111/pce.12924

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