Late day measurement of excised branches results in uncertainty in the estimation of two stomatal parameters derived from response curves in Populus deltoides Bartr. x Populus nigra L.

Davidson, Kenneth J.; Lamour, Julien; Rogers, Alistair; Serbin, Shawn P.

doi:10.1093/treephys/tpac006

Title: Late day measurement of excised branches results in uncertainty in the estimation of two stomatal parameters derived from response curves in Populus deltoides Bartr. x Populus nigra L.

Journal Article · 03 February 2022 · Tree Physiology (Online)

DOI: https://doi.org/10.1093/treephys/tpac006 · OSTI ID:1842009

^[1]; Lamour, Julien ^[2];

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Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Many terrestrial biosphere models depend on an understanding of the relationship between stomatal conductance and photosynthesis. However, unlike the measurement of photosynthetic parameters, such as the maximum carboxylation capacity, where standard methods (e.g., CO₂ response or ACi curves) are widely accepted, a consensus method for empirically measuring parameters representing stomatal response has not yet emerged. Most models of stomatal response to environment represent stomatal conductance as being bounded by a lower intercept parameter (g₀), and linearly scaled based on a multivariate term described by the stomatal slope parameter (g₁). Here we employ the widely used Unified Stomatal Optimization model, to test whether g₁ and g₀ parameters are impacted by the choice of measurement method, either on an intact branch, or a cut branch segment stored in water. We measured paired stomatal response curves on intact and excised branches of a hybrid poplar clone (Populus deltoides Bartr. x Populus nigra L. OP367), measured twice over a diurnal period. We found that predawn branch excision did not significantly affect measured g₀ and g₁ when measured within 4 h of excision. Measurement in the afternoon resulted in significantly higher values of g₁ and lower values of g0, with values changing by 55% and 56% respectively. Excision combined with afternoon measurement resulted in a marked effect on parameter estimates, with g1 increasing 89% from morning to afternoon and a 25% lower g₁ for cut branches than those measured in situ. We also show that in hybrid poplar the differences in parameter estimates obtained from plants measured under different conditions can directly impact models of canopy function, reducing modeled transpiration by 18% over a simulated 12.5-hour period. While these findings are only for a single isohydric woody species, our findings suggest that stomatal optimality parameters may not remain constant throughout the day.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

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

Grant/Contract Number:: SC0012704

OSTI ID:: 1842009

Report Number(s):: BNL-222653-2022-JAAM

Journal Information:: Tree Physiology (Online), Journal Name: Tree Physiology (Online) Journal Issue: 7 Vol. 42; ISSN 1758-4469

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Spectroscopic determination of leaf morphological and biochemical traits for northern temperate and boreal tree species Serbin, Shawn P.; Singh, Aditya; McNeil, Brenden E. Figshare https://doi.org/10.6084/m9.figshare.c.3296417	collection	January 2016

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