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Dryad

Data for: Triose phosphate utilization stress during photosynthesis addressed with dynamic assimilation measurements

Cite this dataset

McClain, Alan; Sharkey, Thomas (2022). Data for: Triose phosphate utilization stress during photosynthesis addressed with dynamic assimilation measurements [Dataset]. Dryad. https://doi.org/10.5061/dryad.n2z34tn10

Abstract

Oscillations in CO2 assimilation rate and associated fluorescence parameters have been observed alongside the triose phosphate utilization (TPU) limitation of photosynthesis for nearly 50 years. However, the mechanics of these oscillations are poorly understood. Here we utilize the recently developed Dynamic Assimilation Techniques (DAT) for measuring the rate of CO2 assimilation to increase our understanding of what physiological condition is required to cause oscillations. We found that TPU limiting conditions alone were insufficient, and that plants must enter TPU limitation quickly to cause oscillations. We found that ramps of CO2 caused oscillations proportional in strength to the speed of the ramp, and that ramps induce oscillations with worse outcomes than oscillations induced by step change of CO2 concentration. An initial overshoot is caused due to a temporary excess of available phosphate. During the overshoot, the plant out-performs steady state TPU and ribulose 1,5-bisphosphate regeneration limitations of photosynthesis but cannot exceed the rubisco limitation. We performed additional optical measurements which support the role of photosystem I reduction and oscillations in availability of NADP+ and ATP in supporting oscillations.

Methods

This data was collected in laboratory in East Lansing MI using LI-COR LI-6800 instruments capable of dynamic assimilation measurements and modified to be able to take optical and fluorescent measurements. Data was processed using R scripts and collated into tables that are presented in this dataset.

Usage notes

All data is presented in comma delimited tabular text.

Funding

United States Department of Energy, Award: DE-FG02-91ER20021