Photosynthetic acclimation to warming in tropical forest tree seedlings

Slot, Martijn; Winter, Klaus

doi:10.1093/jxb/erx071

Cited by 97 publications

(119 citation statements)

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“…Because the temperature optimum of electron transport‐limited photosynthesis tends to be higher than that of Rubsico‐limited photosynthesis, a reduction in this ratio following thermal acclimation may lead to an increase in the optimum temperature of net photosynthesis (Hikosaka, Ishikawa, Borjigidai, Muller, & Onoda, ). The fact that A Max of warmed F. insipida plants measured at elevated temperature was similar to A Max of control plants measured at control temperature, suggests that photosynthesis of these saplings had indeed acclimated, and that the optimum temperature had shifted towards higher values in response to warming, consistent with observations on tropical seedlings (Slot & Winter, ).…”

Section: Discussionsupporting

confidence: 85%

High tolerance of tropical sapling growth and gas exchange to moderate warming

Slot

Winter

2017

Functional Ecology

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The effects of global warming on tropical forest growth and carbon storage are uncertain. While observations on canopy trees indicate negative correlations between temperature and growth, some seedling studies suggest the opposite. These contrasting results may reflect ontogenetic differences in temperature responses, or differences between the performance of potted plants under controlled conditions and plants under more variable conditions in the field. To try to bridge the gap between highly controlled experiments on small seedlings and field observations on canopy trees we conducted two sets of outdoor experiments on saplings up to 2.5 m tall; one set to study the effects of night warming, and another set on the effects of day warming. To test the hypothesis that night warming would reduce growth in tropical saplings through stimulation of respiration, we grew the early‐successional species Ochroma pyramidale in large 380‐L soil containers under ambient night‐time temperature and ambient +4.5°C. To test the hypothesis that day warming would reduce growth by reducing photosynthesis we compared plants in multi‐species and single‐species mesocosms rooted in the ground under ambient and passively warmed daytime conditions. In all experiments we monitored growth and measured foliar physiology and plant biomass allocation. Neither night warming nor day warming significantly affected biomass accumulation and allocation. Height growth increased with night warming in O. pyramidale, but decreased with day warming in late‐successional species. Night warming resulted in acclimation of dark respiration. Day warming resulted in acclimation of photosynthesis in early‐successional species, but warming decreased photosynthesis in late‐successional tree species. The seedling‐to‐sapling transition is a critical stage in the life of trees. We found no evidence that in this juvenile growth phase moderate increases in mean temperature reduce the performance of tropical trees, although increases in peak daytime temperature may negatively impact photosynthesis, especially in late‐successional species. A http://onlinelibrary.wiley.com/doi/10.1111/1365-2435.13001/suppinfo is available for this article.

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Section: Discussionsupporting

confidence: 85%

High tolerance of tropical sapling growth and gas exchange to moderate warming

Slot

Winter

2017

Functional Ecology

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“…Respiration and photosynthesis may acclimate to temperature together such that their ratio ( R/A ) is constant. This is consistent with some measurements of an invariant R/A ratio across a wide range of temperatures, but with some additional variation at exceptionally high or low temperatures (Atkin et al ., ; Aspinwall et al ., ; Slot & Winter, ; Crous et al ., ; Dusenge et al ., ). Importantly, several studies indicated that the R/A ratio changed in response to a change in growth temperature, but that a homeostatic R/A ratio was restored following the development of new leaves (Ziska & Bunce, ; Loveys et al ., ; Campbell et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Climate warming and tree carbon use efficiency in a whole‐tree ¹³CO₂ tracer study

et al. 2019

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Summary Autotrophic respiration is a major driver of the global C cycle and may contribute a positive climate warming feedback through increased atmospheric concentrations of CO2. The extent of this feedback depends on plants' ability to acclimate respiration to maintain a constant carbon use efficiency (CUE). We quantified respiratory partitioning of gross primary production (GPP) and CUE of field‐grown trees in a long‐term warming experiment (+3°C). We delivered a 13C–CO2 pulse to whole tree crowns and chased that pulse in the respiration of leaves, whole crowns, roots, and soil. We also measured the isotopic composition of soil microbial biomass and the respiration rates of leaves and whole crowns. We documented homeostatic respiratory acclimation of foliar and whole‐crown respiration rates; the trees adjusted to experimental warming such that leaf‐level respiration rates were not increased. Experimental warming had no detectable impact on respiratory partitioning or mean residence times. Of the 13C label acquired by the trees, aboveground respiration consumed 10%, belowground respiration consumed 40%, and the remaining 50% was retained. Experimental warming of +3°C did not alter respiratory partitioning at the scale of entire trees, suggesting that complete acclimation of respiration to warming is likely to dampen a positive climate warming feedback.

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“…Acclimation does not necessarily lead to a higher (or even similar) A net under the new growth conditions (Way & Yamori, ). Rather, the net effect of a change in air temperature on plant performance depends on the initial T l , the extent of the T l change, and, to a certain degree, the species and plant functional type (Atkin & Tjoelker, ; Slot & Winter, ; Smith & Dukes, ; Way & Oren, ; Yamori et al, ). Thus, thermal acclimation has a potentially marked effect on biosphere‐atmosphere C feedbacks, on the long‐term mean C balance of ecosystems, and ultimately on atmospheric CO 2 concentrations (Bagley et al, ; Heskel et al, ; Lombardozzi, Bonan, Smith, Dukes, & Fisher, ; Smith, Lombardozzi, Tawfik, Bonan, & Dukes, ; Smith, Malyshev, Shevliakova, Kattge, & Dukes, ).…”

Section: Introductionmentioning

confidence: 99%

Can leaf net photosynthesis acclimate to rising and more variable temperatures?

Vico

Way

Hurry

et al. 2019

Plant Cell & Environment

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Under future climates, leaf temperature (Tl) will be higher and more variable. This will affect plant carbon (C) balance because photosynthesis and respiration both respond to short‐term (subdaily) fluctuations in Tl and acclimate in the longer term (days to months). This study asks the question: To what extent can the potential and speed of photosynthetic acclimation buffer leaf C gain from rising and increasing variable Tl? We quantified how increases in the mean and variability of growth temperature affect leaf performance (mean net CO2 assimilation rates, Anet; its variability; and time under near‐optimal photosynthetic conditions), as mediated by thermal acclimation. To this aim, the probability distribution of Anet was obtained by combining a probabilistic description of short‐ and long‐term changes in Tl with data on Anet responses to these changes, encompassing 75 genera and 111 species, including both C3 and C4 species. Our results show that (a) expected increases in Tl variability will decrease mean Anet and increase its variability, whereas the effects of higher mean Tl depend on species and initial Tl, and (b) acclimation reduces the effects of leaf warming, maintaining Anet at >80% of its maximum under most thermal regimes.

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Photosynthetic acclimation to warming in tropical forest tree seedlings

Abstract: HighlightSeedlings of tropical tree species can acclimate to moderate warming, thereby improving their photosynthetic carbon uptake, but with further warming carbon uptake decreases as plants increasingly operate at supra-optimal temperatures.

Cited by 97 publications

References 53 publications

High tolerance of tropical sapling growth and gas exchange to moderate warming

High tolerance of tropical sapling growth and gas exchange to moderate warming

Climate warming and tree carbon use efficiency in a whole‐tree ¹³CO₂ tracer study

Can leaf net photosynthesis acclimate to rising and more variable temperatures?

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Photosynthetic acclimation to warming in tropical forest tree seedlings

Abstract: HighlightSeedlings of tropical tree species can acclimate to moderate warming, thereby improving their photosynthetic carbon uptake, but with further warming carbon uptake decreases as plants increasingly operate at supra-optimal temperatures.

Cited by 97 publications

References 53 publications

High tolerance of tropical sapling growth and gas exchange to moderate warming

High tolerance of tropical sapling growth and gas exchange to moderate warming

Climate warming and tree carbon use efficiency in a whole‐tree 13CO2 tracer study

Can leaf net photosynthesis acclimate to rising and more variable temperatures?

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Climate warming and tree carbon use efficiency in a whole‐tree ¹³CO₂ tracer study