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Photosynthetic capacity in middle-aged larch and spruce acclimates independently to experimental warming and elevated CO2

Journal Article · · Plant, Cell and Environment
DOI:https://doi.org/10.1111/pce.15068· OSTI ID:2477521
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [2];  [2];  [6];  [2];  [8]
  1. Mount Allison University, Sackville, NB (Canada); Univ. of Western Ontario, London, ON (Canada)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Michigan, Ann Arbor, MI (United States); University of Minnesota, Saint Paul, MN (United States); Univ. of Western Sydney, NSW (Australia)
  4. Univ. of Maryland, College Park, MD (United States)
  5. University of Western Ontario, London, ON (Canada); University of Toronto, Mississauga, ON (Canada); University of Toronto, ON (Canada)
  6. University of Minnesota, Saint Paul, MN (United States)
  7. Universidad de Los Andes, Bogota (Colombia)
  8. Univ. of Western Ontario, London, ON (Canada); Australian National Univ., Canberra, ACT (Australia); Duke Univ., Durham, NC (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
+ Show Author Affiliations
Photosynthetic acclimation to both warming and elevated CO2 of boreal trees remains a key uncertainty in modelling the response of photosynthesis to future climates. We investigated the impact of increased growth temperature and elevated CO2 on photosynthetic capacity (Vcmax and Jmax) in mature trees of two North American boreal conifers, tamarack and black spruce. We show that Vcmax and Jmax at a standard temperature of 25°C did not change with warming, while Vcmax and Jmax at their thermal optima (Topt) and growth temperature (Tg) increased. Moreover, Vcmax and Jmax at either 25°C, Topt or Tg decreased with elevated CO2. The Jmax/Vcmax ratio decreased with warming when assessed at both Topt and Tg but did not significantly vary at 25°C. The Jmax/Vcmax increased with elevated CO2 at either reference temperature. We found no significant interaction between warming and elevated CO2 on all traits. If this lack of interaction between warming and elevated CO2 on the Vcmax, Jmax and Jmax/Vcmax ratio is a general trend, it would have significant implications for improving photosynthesis representation in vegetation models. However, future research is required to investigate the widespread nature of this response in a larger number of species and biomes.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725; SC0012704
OSTI ID:
2477521
Journal Information:
Plant, Cell and Environment, Journal Name: Plant, Cell and Environment Journal Issue: 12 Vol. 47; ISSN 0140-7791
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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