Photosynthetic heat tolerances and extreme leaf temperatures

Perez, Timothy M.; Feeley, Kenneth J.

doi:10.1111/1365-2435.13658

Cited by 73 publications

(107 citation statements)

References 46 publications

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“…greater F v / F m damage) tended to have stronger correlations with carbon assimilation parameters. This is consistent with the hypothesis that larger reductions in the quantum yield have a greater effect on plant carbon economics, and may explain why T crit heat tolerance was not correlated with any metric of carbon assimilation (Perez & Feeley, 2020a). Consequently, T 95 may characterize plant thermal ecological strategies more effectively than T 50 but provide overestimates of T max .…”

Section: Discussionsupporting

confidence: 88%

“…Reported values for T max in tropical plant species range from 40.1 to 41.8°C and are comparable to the temperatures that cause the first signs of damage in F v / F m (i.e. T crit ) for tropical species (Figure 1a; Perez & Feeley, 2020a; Slot, Krause, Krause, Hernández, & Winter, 2018; Tiwari et al, 2020). Coordination between T crit and T max would provide support for the hypothesis that PSII heat tolerance constrains the upper limit of carbon assimilation by limiting electron transport (Slot & Winter, 2017a).…”

Section: Introductionmentioning

confidence: 63%

“…High vapour pressure deficit can cause stomatal closure, which reduces carbon assimilation (Slot & Winter, 2017a, 2017b). When stomata close, latent heat loss is reduced and can lead to high leaf temperatures that are thought to drive variation in PSII heat tolerance (Perez & Feeley, 2020a). Therefore, if some plants possess inherently low stomatal conductance, it may explain why these species also tend to have low P opt and high PSII heat tolerance.…”

Section: Discussionmentioning

confidence: 99%

“…The heat tolerance of plants' photosystem II (PSII) photochemistry may provide a useful estimate of the upper thermal limit of photosynthesis and has the potential to explain the physiological mechanisms underlying some of the ecological responses of plants to climate change (Clark, Piper, Keeling, & Clark, 2003; Doughty & Goulden, 2009; Feeley, Bravo‐Avila, Fadrique, Perez, & Zuleta, 2020; Mau, Reed, Wood, & Cavaleri, 2018; Pau, Detto, Kim, & Still, 2018). Higher heat tolerance of PSII photochemistry is generally assumed to allow for improved growth, reproduction and/or survival in hot environments, presumably by facilitating photosynthesis at high temperatures (Feeley, Martinez‐villa, Perez & Duque 2020; Krause, Winter, Krause, & Virgo, 2015; Tiwari et al, 2020; but see Perez & Feeley, 2020a, 2020b). However, these assumptions have not been widely tested, and it is unclear how PSII heat tolerance integrates with different thermal strategies for understanding the effects of climate change on plants.…”

Section: Introductionmentioning

confidence: 99%

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Photosystem II heat tolerances characterize thermal generalists and the upper limit of carbon assimilation

Perez

Socha

Tserej

et al. 2021

Plant Cell & Environment

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The heat tolerance of photosystem II (PSII) may promote carbon assimilation at higher temperatures and help explain plant responses to climate change. Higher PSII heat tolerance could lead to (a) increases in the high‐temperature compensation point (Tmax); (b) increases in the thermal breadth of photosynthesis (i.e. the photosynthetic parameter Ω) to promote a thermal generalist strategy of carbon assimilation; (c) increases in the optimum rate of carbon assimilation Popt and faster carbon assimilation and/or (d) increases in the optimum temperature for photosynthesis (Topt). To address these hypotheses, we tested if the Tcrit, T50 and T95 PSII heat tolerances were correlated with carbon assimilation parameters for 21 plant species. Our results did not support Hypothesis 1, but we observed that T50 may be used to estimate the upper thermal limit for Tmax at the species level, and that community mean Tcrit may be useful for approximating Tmax. The T50 and T95 heat tolerance metrics were positively correlated with Ω in support of Hypothesis 2. We found no support for Hypotheses 3 or 4. Our study shows that high PSII heat tolerance is unlikely to improve carbon assimilation at higher temperatures but may characterize thermal generalists with slow resource acquisition strategies.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photosystem II heat tolerances characterize thermal generalists and the upper limit of carbon assimilation

Perez

Socha

Tserej

et al. 2021

Plant Cell & Environment

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“…The advantage of warm niche species in warmer treatments may come from physiological adaptations to the warmer environment. For instance, plants differ in photosynthetic and thermal strategies related to variable temperature environments (Aparecido et al, 2020; Dusenge et al, 2019; Michaletz et al, 2015, 2016; Perez & Feeley, 2020). Given the variation in temperature‐dependent photosynthetic strategies, increased temperature may directly limit the leaf lifetime carbon gain of species with colder niches below needs for maintenance and survival, while warmer niche species gain carbon in excess of maintenance for reproduction.…”

Section: Discussionmentioning

confidence: 99%

Macroecological context predicts species' responses to climate warming

Lynn

Klanderud

Telford

et al. 2021

Global Change Biology

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Context‐dependencies in species' responses to the same climate change frustrate attempts to generalize and make predictions based on experimental and observational approaches in biodiversity science. Here, we propose predictability may be enhanced by explicitly incorporating macroecological context into analyses of species' responses to climate manipulations. We combined vascular plant species' responses to an 8‐year, 12‐site turf transplant climate change experiment set in southwestern Norway with climate niche data from the observed 151 species. We used the difference between a species' mean climate across their range and climate conditions at the transplant site (“climate differences”) to predict colonization probability, extinction probability, and change in abundance of a species at a site. In analyses across species that ignore species‐specific patterns, colonization success increased as species' distribution optima were increasingly warmer than the experimental target site. Extinction probability increased as species' distribution optima were increasingly colder than the target site. These patterns were reflected in change in abundance analyses. We found weak responses to increased precipitation in these oceanic climates. Climate differences were better predictors of species' responses to climate manipulations than range size. Interestingly, similar patterns were found when analyses focused on variation in species‐specific responses across sites. These results provide an experimental underpinning to observational studies that report thermophilization of communities and suggest that space‐for‐time substitutions may be valid for predicting species' responses to climate warming, given other conditions are accounted for (e.g., soil nutrients). Finally, we suggest that this method of putting climate change experiments into macroecological context has the potential to generalize and predict species' responses to climate manipulations globally.

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Climate‐driven thermal opportunities and risks for leaf miners in aspen canopies

Woods

Legault

Kingsolver

et al. 2022

Ecological Monographs

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In tree canopies, incoming solar radiation interacts with leaves and branches to generate temperature differences within and among leaves, presenting thermal opportunities and risks for leaf‐dwelling ectotherms. Although leaf biophysics and insect thermal ecology are well understood, few studies have examined them together in single systems. We examined temperature variability in aspen canopies, Populus tremuloides, and its consequences for a common herbivore, the leaf‐mining caterpillar Phyllocnistis populiella. We shaded leaves in the field and measured effects on leaf temperature and larval growth and survival. We also estimated larval thermal performance curves for feeding and growth and measured upper lethal temperatures. Sunlit leaves directly facing the incoming rays reached the highest temperatures, typically 3–8°C above ambient air temperature. Irradiance‐driven increases in temperature, however, were transient enough that they did not alter observed growth rates of leaf miners. Incubator and ramping experiments suggested that larval performance peaks between 25 and 32°C and declines to zero between 35 and 40°C, depending on the duration of temperature exposure. Upper lethal temperatures during 1‐h heat shocks were 42–43°C. When larvae were active in early spring, temperatures generally were low enough to depress rates of feeding and growth below their maxima, and only rarely did estimated mine temperatures rise beyond optimal temperatures. Observed leaf or mine temperatures never approached larval upper lethal temperatures. At this site during our experiments, larvae thus appeared to have a significant thermal safety margin; the more pressing problem was inadequate heat. Detailed information on mine temperatures and larval performance curves, however, allowed us to leverage long‐term data sets on air temperature to estimate potential future shifts in performance and longer‐term risks to larvae from lethally high temperatures. This analysis suggests that, in the past 20 years, larval performance has often been limited by cold and that the risk of heat stress has been low. Future warming will raise mean rates of feeding and growth but also the risk of exposure to injuriously or lethally high temperatures.

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Photosynthetic heat tolerances and extreme leaf temperatures

Cited by 73 publications

References 46 publications

Photosystem II heat tolerances characterize thermal generalists and the upper limit of carbon assimilation

Photosystem II heat tolerances characterize thermal generalists and the upper limit of carbon assimilation

Macroecological context predicts species' responses to climate warming

Climate‐driven thermal opportunities and risks for leaf miners in aspen canopies

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