Immediate and potential long-term effects of consecutive heat waves on the photosynthetic performance and water balance in Douglas-fir

Duarte, André G.; Katata, Genki; Hoshika, Yasutomo; Hossain, Mohitul; Kreuzwieser, Jürgen; Arneth, Almut; Ruehr, Nadine K.

doi:10.1016/j.jplph.2016.08.012

Cited by 49 publications

(59 citation statements)

References 47 publications

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“…An exception is Duarte et al . (), who found a lower g 0 in a heat wave treatment in P. menziesii (although g 1 was unaffected), but, in their case, g 0 was very accurately estimated by careful multi‐point light response curves. Another exception is Misson et al .…”

Section: Use Of Minimum Conductance In Modelsmentioning

confidence: 90%

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On the minimum leaf conductance: its role in models of plant water use, and ecological and environmental controls

et al. 2018

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Contents Summary I. Introduction II. Comparison of various definitions and measurement techniques of minimum conductance III. Cuticular conductance IV. Contribution of stomata V. Environmental and ecological variation in minimum conductance VI. Use of minimum conductance in models VII. Conclusions Acknowledgements References SUMMARY: When the rate of photosynthesis is greatly diminished, such as during severe drought, extreme temperature or low light, it seems advantageous for plants to close stomata and completely halt water loss. However, water loss continues through the cuticle and incompletely closed stomata, together constituting the leaf minimum conductance (g ). In this review, we critically evaluate the sources of variation in g , quantitatively compare various methods for its estimation, and illustrate the role of g in models of leaf gas exchange. A literature compilation of g as measured by the weight loss of detached leaves is presented, which shows much variation in this trait, which is not clearly related to species groups, climate of origin or leaf type. Much evidence points to the idea that g is highly responsive to the growing conditions of the plant, including soil water availability, temperature and air humidity - as we further demonstrate with two case studies. We pay special attention to the role of the minimum conductance in the Ball-Berry model of stomatal conductance, and caution against the usual regression-based method for its estimation. The synthesis presented here provides guidelines for the use of g in ecosystem models, and points to clear research gaps for this drought tolerance trait.

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Section: Use Of Minimum Conductance In Modelsmentioning

confidence: 90%

“…The direction of this response is consistent with Duarte et al . (), who reported lower g 0 and g dark in a heat wave treatment in Pseudotsuga menziesii , which persisted for some time. Responses across temperature gradients are more complex.…”

Section: Environmental and Ecological Variation In Minimum Conductancementioning

confidence: 95%

On the minimum leaf conductance: its role in models of plant water use, and ecological and environmental controls

et al. 2018

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“…For instance, during the peak heatwave, EC showed high g s and T leaf values below 45°C, whereas EB showed much lower g s and T leaf >45°C (Figure ). Importantly, temperatures >45°C can significantly inhibit PSII capacity by increasing thylakoid membrane permeability resulting in proton leakage and reduced electron transport (Allakhverdiev et al, ; Duarte et al, ; Sharkey, ). These results suggest impairment of energy transfer and production at high temperatures, particularly in EB since that species was most negatively affected by the heatwave.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, growth at warmer temperatures did not substantially influence leaf cooling during the heatwave. In comparison, prior warming treatments of a larger magnitude or prior heat events have been shown to reduce g s during extreme heatwaves (Bauweraerts et al, ; Duarte et al, ). Prior growth temperature had no significant effect on isoprene emissions or physiological acclimation to the heatwave, indicating that these factors cannot explain greater heatwave damage in warm‐grown trees.…”

Section: Discussionmentioning

confidence: 99%

Range size and growth temperature influence Eucalyptus species responses to an experimental heatwave

Aspinwall

Pfautsch

Tjoelker

et al. 2019

Global Change Biology

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Understanding forest tree responses to climate warming and heatwaves is important for predicting changes in tree species diversity, forest C uptake, and vegetation–climate interactions. Yet, tree species differences in heatwave tolerance and their plasticity to growth temperature remain poorly understood. In this study, populations of four Eucalyptus species, two with large range sizes and two with comparatively small range sizes, were grown under two temperature treatments (cool and warm) before being exposed to an equivalent experimental heatwave. We tested whether the species with large and small range sizes differed in heatwave tolerance, and whether trees grown under warmer temperatures were more tolerant of heatwave conditions than trees grown under cooler temperatures. Visible heatwave damage was more common and severe in the species with small rather than large range sizes. In general, species that showed less tissue damage maintained higher stomatal conductance, lower leaf temperatures, larger increases in isoprene emissions, and less photosynthetic inhibition than species that showed more damage. Species exhibiting more severe visible damage had larger increases in heat shock proteins (HSPs) and respiratory thermotolerance (Tmax). Thus, across species, increases in HSPs and Tmax were positively correlated, but inversely related to increases in isoprene emissions. Integration of leaf gas‐exchange, isoprene emissions, proteomics, and respiratory thermotolerance measurements provided new insight into mechanisms underlying variability in tree species heatwave tolerance. Importantly, warm‐grown seedlings were, surprisingly, more susceptible to heatwave damage than cool‐grown seedlings, which could be associated with reduced enzyme concentrations in leaves. We conclude that species with restricted range sizes, along with trees growing under climate warming, may be more vulnerable to heatwaves of the future.

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“…Photosynthetically active radiation (PQS1, Kipp & Zonen, Delft, the Netherlands), air temperature and relative humidity (CS251, Campbell Scientific Inc., Logan, UT, USA) in each greenhouse compartment were monitored by two sensors each. During nonstress conditions, differences in environmental conditions between the two compartments of the greenhouse were generally small during both years of the experiment (Ruehr et al, 2016;Duarte et al, 2016). Prior to the first heatwave, the black locust trees grew under the same environmental conditions from 7 May to 13 June and none of the environmental drivers differed by more than 2 % (see Table 1).…”

Section: Methodsmentioning

confidence: 99%

Isoprene emission and photosynthesis during heatwaves and drought in black locust

et al. 2017

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Abstract. Extreme weather conditions like heatwaves and drought can substantially affect tree physiology and the emissions of isoprene. To date, however, there is only limited understanding of isoprene emission patterns during prolonged heat stress and next to no data on emission patterns during coupled heat-drought stress or during post-stress recovery. We studied gas exchange and isoprene emissions of black locust trees under episodic heat stress and in combination with drought. Heatwaves were simulated in a controlled greenhouse facility by exposing trees to outside temperatures +10 • C, and trees in the heat-drought treatment were supplied with half of the irrigation water given to heat and control trees. Leaf gas exchange of isoprene, CO 2 and H 2 O was quantified using self-constructed, automatically operating chambers, which were permanently installed on leaves (n = 3 per treatment). Heat and combined heatdrought stress resulted in a sharp decline of net photosynthesis (A net ) and stomatal conductance. Simultaneously, isoprene emissions increased 6-to 8-fold in the heat and heatdrought treatment, which resulted in a carbon loss that was equivalent to 12 and 20 % of assimilated carbon at the time of measurement. Once temperature stress was released at the end of two 15-day-long heatwaves, stomatal conductance remained reduced, while isoprene emissions and A net recovered quickly to values of the control trees. Further, we found that isoprene emissions covaried with A net during nonstress conditions, while during the heatwaves, isoprene emissions were not related to A net but to light and temperature. Under standard air temperature and light conditions (here 30 • C and photosynthetically active radiation of 500 µmol m −2 s −1 ), isoprene emissions of the heat trees were by 45 % and the heat-drought trees were by 27 % lower than in control trees. Moreover, temperature response curves showed that not only the isoprene emission factor changed during both heat and heat-drought stress, but also the shape of the response. Because introducing a simple treatment-specific correction factor could not reproduce stress-induced isoprene emissions, different parameterizations of light and temperature functions are needed to describe tree isoprene emissions under heat and combined heat-drought stress. In order to increase the accuracy of predictions of isoprene emissions in response to climate extremes, such individual stress parameterizations should be introduced to current BVOC models.

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Immediate and potential long-term effects of consecutive heat waves on the photosynthetic performance and water balance in Douglas-fir

Cited by 49 publications

References 47 publications

On the minimum leaf conductance: its role in models of plant water use, and ecological and environmental controls

On the minimum leaf conductance: its role in models of plant water use, and ecological and environmental controls

Range size and growth temperature influence Eucalyptus species responses to an experimental heatwave

Isoprene emission and photosynthesis during heatwaves and drought in black locust

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