Photosynthetic responses of two eucalypts to industrial‐age changes in atmospheric [CO<sub>2</sub>] and temperature

Ghannoum, Oula; Phillips, Nathan; Sears, Marie A.; Logan, Barry A.; Lewis, James D.; Conroy, Jann P.; Tissue, David T.

doi:10.1111/j.1365-3040.2010.02172.x

Cited by 94 publications

(74 citation statements)

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“…The responses of photosynthesis to HS depends on adaptation strategies to habitat conditions (Knight and Ackerly, 2002; Cunningham and Read, 2006; Weston and Bauerle, 2007; Gunderson et al, 2010) and climate change scenarios such as CO 2 elevation (Wang et al, 2008a, 2012). However, the species differences were not always found (Ghannoum et al, 2010) or the thermotolerance of species was reported to be unrelated to the temperature at their site of origin (Lin et al, 2013). In contrast with our hypothesis, both species showed reduced A net during HS and the sensitivity of A net of the two species responding to the HS did not vary significantly ( Figure 5 ; Table 1 ).…”

Section: Discussionmentioning

confidence: 99%

Timing Effects of Heat-Stress on Plant Ecophysiological Characteristics and Growth

et al. 2016

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Heat-waves with higher intensity and frequency and longer durations are expected in the future due to global warming, which could have dramatic impacts in agriculture, economy and ecology. This field study examined how plant responded to heat-stress (HS) treatment at different timing in naturally occurring vegetation. HS treatment (5 days at 40.5 • C) were applied to 12 1 m 2 plots in restored prairie vegetation dominated by a warm-season C 4 grass, Andropogon gerardii, and a warm-season C 3 forb, Solidago canadensis, at different growing stages. During and after each heat stress (HS) treatment, temperature were monitored for air, canopy, and soil; net CO 2 assimilation (A net ), quantum yield of photosystem II ( PSII ), stomatal conductance (g s ), and internal CO 2 level (C i ), specific leaf area (SLA), and chlorophyll content of the dominant species were measured. One week after the last HS treatment, all plots were harvested and the biomass of above-ground tissue and flower weight of the two dominant species were determined. HS decreased physiological performance and growth for both species, with S. canadensis being affected more than A. gerardii, indicated by negative HS effect on both physiological and growth responses for S. canadensis. There were significant timing effect of HS on the two species, with greater reductions in the net photosynthetic rate and productivity occurred when HS was applied at later-growing season. The reduction in aboveground productivity in S. canadensis but not A. gerardii could have important implications for plant community structure by increasing the competitive advantage of A. gerardii in this grassland. The present experiment showed that HS, though ephemeral, may promote long-term effects on plant community structure, vegetation dynamics, biodiversity, and ecosystem functioning of terrestrial biomes when more frequent and severe HS occur in the future.Keywords: global climate change, photosynthesis, aboveground productivity, Solidago canadensis, Andropogon gerardii Abbreviations: A net , net photosynthetic rate (µmol m −2 s −1 ); ANPP, Aboveground net primary production (g); g s , stomatal conductance to water vapor (mol m −2 s −1 ); HS, heat stress; LAI, leaf area index (m 2 m −2 ); LWC, (leaf water content, %); SLA, specific leaf area (m 2 kg −1 ); W a , aboveground biomass (g); W f , biomass of flowers (g); i WUE, intrinsic water use efficiency (the ratio of A net to g s) ; PSII , quantum yield of electron transport of photoystem II.

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Section: Discussionmentioning

confidence: 99%

Timing Effects of Heat-Stress on Plant Ecophysiological Characteristics and Growth

et al. 2016

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“…Evidence for acclimation potential has been documented for deciduous trees (Gunderson et al, 2010) and eucalypts (Ghannoum et al, 2010) in temperate environments, and evidence from another study (Cunningham and Read, 2003b) has indicated that temperate species have a higher acclimation potential than tropical species. The latter study is of particular relevance here because it compared temperate and tropical rainforest trees of Australia.…”

Section: Physiological Tolerances and Acclimation Potentialmentioning

confidence: 99%

Will tropical mountaintop plant species survive climate change? Identifying key knowledge gaps using species distribution modelling in Australia

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et al. 2015

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“…There is growing evidence that photosynthesis would have been CO 2 ‐limited during the pre‐industrial Holocene epoch (Sage & Reid, 1992; Tissue et al. , 1995; Sage & Coleman, 2001; Campbell & Sage, 2006; Ghannoum et al. , 2010b).…”

Section: Introductionmentioning

confidence: 99%

Impacts of drought on leaf respiration in darkness and light in Eucalyptus saligna exposed to industrial‐age atmospheric CO₂ and growth temperature

et al. 2011

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Summary• Our study assessed the impact of a wide range of industrial-age climate scenarios on leaf respiration (R) in Eucalyptus saligna.• Well-watered or sustained drought-treated plants were grown in glasshouses differing in atmospheric CO 2 concentration ([CO 2 ]) (280, 400 and 640 ll l )1 ) and temperature (26 and 30°C). Rates of R in darkness (R dark ) and light (R light ), photosynthesis (A) and related leaf traits (mass : area relationships, and nitrogen, phosphorus, starch and sugar concentrations) were measured.• Light inhibited R in all cases (R light < R dark ) (well-watered: 40%; droughttreated: 73%). Growth [CO 2 ] and temperature had little impact on area-based rates of R dark or R light , with R light exhibiting minimal thermal acclimation. By contrast, sustained drought resulted in reduced R dark , R light and A, with the inhibitory effect of drought on A and R light (c. 50-70%) greater than that on R dark (c. 15%). Drought effects were fully reversible after watering. Variability in R light appeared to be dependent on the underlying rate of R dark and associated Rubisco activity.• Collectively, our data suggest that there is an asynchronous response of leaf carbon metabolism to drought, and a tighter coupling between R light and A than between R dark and A, under both past and future climate scenarios. These findings have important implications for ecosystem ⁄ global models seeking to predict carbon cycling.

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Photosynthetic responses of two eucalypts to industrial‐age changes in atmospheric [CO₂] and temperature

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Cited by 94 publications

References 65 publications

Timing Effects of Heat-Stress on Plant Ecophysiological Characteristics and Growth

Timing Effects of Heat-Stress on Plant Ecophysiological Characteristics and Growth

Will tropical mountaintop plant species survive climate change? Identifying key knowledge gaps using species distribution modelling in Australia

Impacts of drought on leaf respiration in darkness and light in Eucalyptus saligna exposed to industrial‐age atmospheric CO₂ and growth temperature

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Photosynthetic responses of two eucalypts to industrial‐age changes in atmospheric [CO2] and temperature

Abstract: ABSTRACT

Cited by 94 publications

References 65 publications

Timing Effects of Heat-Stress on Plant Ecophysiological Characteristics and Growth

Timing Effects of Heat-Stress on Plant Ecophysiological Characteristics and Growth

Will tropical mountaintop plant species survive climate change? Identifying key knowledge gaps using species distribution modelling in Australia

Impacts of drought on leaf respiration in darkness and light in Eucalyptus saligna exposed to industrial‐age atmospheric CO2 and growth temperature

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Resources

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Photosynthetic responses of two eucalypts to industrial‐age changes in atmospheric [CO₂] and temperature

Impacts of drought on leaf respiration in darkness and light in Eucalyptus saligna exposed to industrial‐age atmospheric CO₂ and growth temperature