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Stomatal conductance, not biochemistry, drives low temperature acclimation of photosynthesis in Populus balsamifera, regardless of nitrogen availability

Journal Article · · Plant Biology
DOI:https://doi.org/10.1111/plb.13428· OSTI ID:1863888
 [1];  [2];  [1];  [3]
  1. Univ. of Western Ontario, London, ON (Canada)
  2. Univ. of Western Ontario, London, ON (Canada); Duke Univ., Durham, NC (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Texas Tech Univ., Lubbock, TX (United States)
Low temperature thermal acclimation may require adjustments to nitrogen and water use to sustain photosynthesis due to slow enzyme functioning and high-water viscosity. However, understanding of photosynthetic acclimation to temperatures below 11°C is limited. Here, we acclimated Populus balsamifera to 6 °C and 10 °C (6A and 10A, respectively) and provided the trees with either high or low N fertilizer. We measured net CO2 assimilation rates (Anet), stomatal conductance (gs ), maximum rates of Rubisco carboxylation (Vcmax) and electron transport (Jmax), and dark respiration (Rd) at leaf temperatures of 2, 6, 10, 14 and 18 °C, along with leaf N concentrations. The 10A trees had higher Anet than the 6A trees at warmer leaf temperatures, which was correlated with higher gs in the 10A trees. The instantaneous temperature responses of Vcmax, Jmax and Rd were similar for trees from both acclimation temperatures. While soil N availability increased leaf N concentrations, this had no effect on acclimation of photosynthesis or respiration. Our results indicate that acclimation below 11°C occurred primarily through changes in stomatal conductance, not photosynthetic biochemistry, and was unaffected by short-term N supply. Thermal acclimation of stomatal conductance should therefore be a priority for future carbon cycle model development.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
BNL Program Development; Natural Sciences and Engineering Research Council of Canada (NSERC); Texas Tech University; USDOE
Grant/Contract Number:
SC0012704
OSTI ID:
1863888
Alternate ID(s):
OSTI ID: 1902549
Report Number(s):
BNL-222938-2022-JAAM
Journal Information:
Plant Biology, Journal Name: Plant Biology Journal Issue: 5 Vol. 24; ISSN 1435-8603
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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