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Title: Limited thermal acclimation of photosynthesis in tropical montane tree species

Abstract

Abstract The temperature sensitivity of physiological processes and growth of tropical trees remains a key uncertainty in predicting how tropical forests will adjust to future climates. In particular, our knowledge regarding warming responses of photosynthesis, and its underlying biochemical mechanisms, is very limited. We grew seedlings of two tropical montane rainforest tree species, the early‐successional species Harungana montana and the late‐successional species Syzygium guineense , at three different sites along an elevation gradient, differing by 6.8℃ in daytime ambient air temperature. Their physiological and growth performance was investigated at each site. The optimum temperature of net photosynthesis ( T optA ) did not significantly increase in warm‐grown trees in either species. Similarly, the thermal optima ( T optV and T optJ ) and activation energies ( E aV and E aJ ) of maximum Rubisco carboxylation capacity ( V cmax ) and maximum electron transport rate ( J max ) were largely unaffected by warming. However, V cmax , J max and foliar dark respiration ( R d ) at 25℃ were significantly reduced by warming in both species, and this decline was partly associated with concomitant reduction in total leaf nitrogen content. The ratio of J max / Vmore » cmax decreased with increasing leaf temperature for both species, but the ratio at 25℃ was constant across sites. Furthermore, in H . montana , stomatal conductance at 25℃ remained constant across the different temperature treatments, while in S . guineense it increased with warming. Total dry biomass increased with warming in H . montana but remained constant in S . guineense . The biomass allocated to roots, stem and leaves was not affected by warming in H . montana , whereas the biomass allocated to roots significantly increased in S . guineense . Overall, our findings show that in these two tropical montane rainforest tree species, the capacity to acclimate the thermal optimum of photosynthesis is limited while warming‐induced reductions in respiration and photosynthetic capacity rates are tightly coupled and linked to responses of leaf nitrogen.« less

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6]; ORCiD logo [7];  [5]; ORCiD logo [8]; ORCiD logo [9]
  1. Department of Biological and Environmental Sciences University of Gothenburg Gothenburg Sweden, School of Forestry, Biodiversity and Biological Sciences College of Agriculture, Animal Sciences and Veterinary Medicine University of Rwanda Musanze Rwanda, Department of Biology The University of Western Ontario London ON Canada, Gothenburg Global Biodiversity Centre (GGBC) University of Gothenburg Gothenburg Sweden
  2. Department of Biological and Environmental Sciences University of Gothenburg Gothenburg Sweden, Gothenburg Global Biodiversity Centre (GGBC) University of Gothenburg Gothenburg Sweden, Department of Biology College of Science and Technology University of Rwanda Huye Rwanda
  3. Department of Biological and Environmental Sciences University of Gothenburg Gothenburg Sweden, Department of Biology College of Science and Technology University of Rwanda Huye Rwanda
  4. Department of Biology College of Science and Technology University of Rwanda Huye Rwanda, World Agroforestry (ICRAF) Huye Rwanda
  5. School of Forestry, Biodiversity and Biological Sciences College of Agriculture, Animal Sciences and Veterinary Medicine University of Rwanda Musanze Rwanda
  6. Department of Biological and Environmental Sciences University of Gothenburg Gothenburg Sweden, Department of Biology College of Science and Technology University of Rwanda Huye Rwanda, Rwanda Agriculture and Animal Resources Development Board Kigali Rwanda
  7. Department of Biology The University of Western Ontario London ON Canada, Division of Plant Sciences Research School of Biology The Australian National University Canberra ACT Australia, Environmental and Climate Sciences Department Brookhaven National Laboratory Upton NY USA, Nicholas School of the Environment Duke University Durham NC USA
  8. Department of Biological and Environmental Sciences University of Gothenburg Gothenburg Sweden, Gothenburg Global Biodiversity Centre (GGBC) University of Gothenburg Gothenburg Sweden
  9. Department of Biological and Environmental Sciences University of Gothenburg Gothenburg Sweden
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1808602
Alternate Identifier(s):
OSTI ID: 1809075; OSTI ID: 1818830
Report Number(s):
BNL-221834-2021-JAAM
Journal ID: ISSN 1354-1013
Grant/Contract Number:  
DE‐SC0012704; SC0012704
Resource Type:
Published Article
Journal Name:
Global Change Biology
Additional Journal Information:
Journal Name: Global Change Biology Journal Volume: 27 Journal Issue: 19; Journal ID: ISSN 1354-1013
Publisher:
Wiley-Blackwell
Country of Publication:
United Kingdom
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Africa; Vcmax and Jmax; leaf dark respiration; climate change; warming; biomass

Citation Formats

Dusenge, Mirindi Eric, Wittemann, Maria, Mujawamariya, Myriam, Ntawuhiganayo, Elisée B., Zibera, Etienne, Ntirugulirwa, Bonaventure, Way, Danielle A., Nsabimana, Donat, Uddling, Johan, and Wallin, Göran. Limited thermal acclimation of photosynthesis in tropical montane tree species. United Kingdom: N. p., 2021. Web. doi:10.1111/gcb.15790.
Dusenge, Mirindi Eric, Wittemann, Maria, Mujawamariya, Myriam, Ntawuhiganayo, Elisée B., Zibera, Etienne, Ntirugulirwa, Bonaventure, Way, Danielle A., Nsabimana, Donat, Uddling, Johan, & Wallin, Göran. Limited thermal acclimation of photosynthesis in tropical montane tree species. United Kingdom. https://doi.org/10.1111/gcb.15790
Dusenge, Mirindi Eric, Wittemann, Maria, Mujawamariya, Myriam, Ntawuhiganayo, Elisée B., Zibera, Etienne, Ntirugulirwa, Bonaventure, Way, Danielle A., Nsabimana, Donat, Uddling, Johan, and Wallin, Göran. Fri . "Limited thermal acclimation of photosynthesis in tropical montane tree species". United Kingdom. https://doi.org/10.1111/gcb.15790.
@article{osti_1808602,
title = {Limited thermal acclimation of photosynthesis in tropical montane tree species},
author = {Dusenge, Mirindi Eric and Wittemann, Maria and Mujawamariya, Myriam and Ntawuhiganayo, Elisée B. and Zibera, Etienne and Ntirugulirwa, Bonaventure and Way, Danielle A. and Nsabimana, Donat and Uddling, Johan and Wallin, Göran},
abstractNote = {Abstract The temperature sensitivity of physiological processes and growth of tropical trees remains a key uncertainty in predicting how tropical forests will adjust to future climates. In particular, our knowledge regarding warming responses of photosynthesis, and its underlying biochemical mechanisms, is very limited. We grew seedlings of two tropical montane rainforest tree species, the early‐successional species Harungana montana and the late‐successional species Syzygium guineense , at three different sites along an elevation gradient, differing by 6.8℃ in daytime ambient air temperature. Their physiological and growth performance was investigated at each site. The optimum temperature of net photosynthesis ( T optA ) did not significantly increase in warm‐grown trees in either species. Similarly, the thermal optima ( T optV and T optJ ) and activation energies ( E aV and E aJ ) of maximum Rubisco carboxylation capacity ( V cmax ) and maximum electron transport rate ( J max ) were largely unaffected by warming. However, V cmax , J max and foliar dark respiration ( R d ) at 25℃ were significantly reduced by warming in both species, and this decline was partly associated with concomitant reduction in total leaf nitrogen content. The ratio of J max / V cmax decreased with increasing leaf temperature for both species, but the ratio at 25℃ was constant across sites. Furthermore, in H . montana , stomatal conductance at 25℃ remained constant across the different temperature treatments, while in S . guineense it increased with warming. Total dry biomass increased with warming in H . montana but remained constant in S . guineense . The biomass allocated to roots, stem and leaves was not affected by warming in H . montana , whereas the biomass allocated to roots significantly increased in S . guineense . Overall, our findings show that in these two tropical montane rainforest tree species, the capacity to acclimate the thermal optimum of photosynthesis is limited while warming‐induced reductions in respiration and photosynthetic capacity rates are tightly coupled and linked to responses of leaf nitrogen.},
doi = {10.1111/gcb.15790},
journal = {Global Change Biology},
number = 19,
volume = 27,
place = {United Kingdom},
year = {Fri Jul 16 00:00:00 EDT 2021},
month = {Fri Jul 16 00:00:00 EDT 2021}
}

Journal Article:
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https://doi.org/10.1111/gcb.15790

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