The Dynamic Assimilation Technique measures photosynthetic CO2 response curves with similar fidelity to steady-state approaches in half the time

Tejera-Nieves, Mauricio; Seong, Do Young; Reist, Lucas; Walker, Berkley J.; Rogers, ed., Alistair

doi:10.1093/jxb/erae057

The Dynamic Assimilation Technique measures photosynthetic CO2 response curves with similar fidelity to steady-state approaches in half the time

Journal Article · Wed Feb 14 23:00:00 EST 2024 · Journal of Experimental Botany

DOI:https://doi.org/10.1093/jxb/erae057· OSTI ID:2352299

; Seong, Do Young; ; ; Rogers, ed., Alistair

Abstract

The net CO2 assimilation (A) response to intercellular CO2 concentration (Ci) is a fundamental measurement in photosynthesis and plant physiology research. The conventional A/Ci protocols rely on steady-state measurements and take 15–40 min per measurement, limiting data resolution or biological replication. Additionally, there are several CO2 protocols employed across the literature, without clear consensus as to the optimal protocol or systematic biases in their estimations. We compared the non-steady-state Dynamic Assimilation Technique (DAT) protocol and the three most used CO2 protocols in steady-state measurements, and tested whether different CO2 protocols lead to systematic differences in estimations of the biochemical limitations to photosynthesis. The DAT protocol reduced the measurement time by almost half without compromising estimation accuracy or precision. The monotonic protocol was the fastest steady-state method. Estimations of biochemical limitations to photosynthesis were very consistent across all CO2 protocols, with slight differences in Rubisco carboxylation limitation. The A/Ci curves were not affected by the direction of the change of CO2 concentration but rather the time spent under triose phosphate utilization (TPU)-limited conditions. Our results suggest that the maximum rate of Rubisco carboxylation (Vcmax), linear electron flow for NADPH supply (J), and TPU measured using different protocols within the literature are comparable, or at least not systematically different based on the measurement protocol used.

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Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

OSTI ID:: 2352299

Alternate ID(s):: OSTI ID: 2318742
OSTI ID: 2471972

Journal Information:: Journal of Experimental Botany, Journal Name: Journal of Experimental Botany Journal Issue: 10 Vol. 75; ISSN 0022-0957

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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