Interactions between temperature and intercellular CO2 concentration in controlling leaf isoprene emission rates

Monson, Russell K.; Neice, Amberly A.; Trahan, N. A.; Shiach, Ian; McCorkel, Joel; Moore, David J. P.

doi:10.1111/pce.12787

Cited by 21 publications

(36 citation statements)

References 54 publications

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“…In our experiment, a significantly reduced isoprene emission rate under [ enriched O 3 ] was observed for Q. mongolica, and Ci under [ enriched O 3 ] was significantly higher than that in the other two treatments. This result is consistent with those of the abovementioned studies of Yuan et al 2016 andMonson et al 2016 . However, we did not see a significantly lower DMAPP content in the two species during July and September.…”

Section: Discussionsupporting

confidence: 83%

“…Yuan et al 2016 speculated that higher Ci due to the reduced photosynthetic rate under [ enriched O 3 ] might decrease the availability of phosphoenolpyruvate PEP for isoprene synthesis. Monson et al 2016 obtained an A-Ci curve for field-grown poplar at ambient O 3 levels and showed that the isoprene emission rate decreased with an increase in Ci at 25 C. The authors attributed the cause to a decreased pool size of DMAPP with the increase in Ci. As evidence for this hypothesis, the DMAPP content was observed to be lower under [ enriched O 3 ] than under the control in the aspen FACE experiment Calfapietra et al, 2008 .…”

Section: Discussionmentioning

confidence: 99%

“…In this case, limited supply of PEP for DMAPP synthesis resulting from very low A and high Ci significantly different between treatments in the first-year experiment might have resulted in the decreased DMAPP content in the O 3 -fumigated leaves Fig. 4 Yuan et al 2016, Monson et al, 2016 In the climate chamber experiments, it was unclear whether the decreased activity of isoprene synthase co-occurred, but the reduction in DMAPP content might be a major reason for the decreased E. Thus, isoprene emission from Q. serrata was affected in a different manner by enriched ozone, depending on the experimental conditions.…”

Section: Discussionmentioning

confidence: 99%

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Effects of ozone on isoprene emission from two major Quercus species native to East Asia

Tani

Ohno

Saito

et al. 2017

J. Agric. Meteorol.

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Quercus species occur widely in East Asia and are major tree species in Japan. The ground-grown seedlings of Quercus serrata and Quercus mongolica var. crispula were exposed to enriched ozone ambient + 40 ppbv over one growing season by using open-top-chambers OTC , and isoprene emissions from the two tree-species were measured across a growing season by using the leaf cuvette method. The isoprene emission rates of the two species were significantly affected by ozone, and the rate of Q. mongolica was reduced to a greater extent by ozone in October than that of Q. serrata. The stomatal conductance of Q. mongolica was higher than that of Q. serrata and not affected by O 3 even in September, suggesting that Q. mongolica absorbed a larger amount of ozone than Q. serrata did. Since the leaf content of the isoprene precursor dimethylallyl diphosphate DMAPP was not significantly different between the enriched ozone and filtered air treatments in July and September, isoprene synthase activity in Q. mongolica leaves might have been reduced to a greater extent by the high concentration of ozone due to higher ozone uptake via stomata. Ozone fumigation was also applied to potted Q. serrata seedlings grown in climate chambers to investigate the ozone effect under different growing conditions. The net photosynthetic rate and isoprene emission rate of the potted seedlings were much lower than those of the ground-grown seedlings in the OTC, regardless of the ozone treatments. Between treatments, the isoprene emission rate and DMAPP content were significantly decreased by enriched ozone, suggesting that reduced production of DMAPP is a cause of the decreased isoprene emission. Our two fumigation experiments revealed that the isoprene emission rates of the two Quercus species was decreased by high ozone concentration, but the possible mechanism may not be identical, depending on the experimental conditions.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of ozone on isoprene emission from two major Quercus species native to East Asia

Tani

Ohno

Saito

et al. 2017

J. Agric. Meteorol.

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“…, Niinemets and Sun , Monson et al. ). If the current physiological mechanistic models are correct, then elevated CO 2 will not suppress isoprene emissions under high temperatures.…”

Section: Discussionmentioning

confidence: 99%

“…It has been shown that elevated CO 2 inhibits leaf-level isoprene emissions when temperatures are not elevated (Sharkey et al 1991, Sharkey andMonson 2014). Recent work, however, has shown that this CO 2 -caused reduction in isoprene emission disappears under higher temperatures and has presented convincing evidence for the mechanism underlying the temperature dependency of the CO 2 suppression (Sun et al 2013, Potosnak et al 2014, Niinemets and Sun 2015, Monson et al 2016). If the current physiological mechanistic models are correct, then elevated CO 2 will not suppress isoprene emissions under high temperatures.…”

Section: Uncertaintiesmentioning

confidence: 99%

Biodiversity matters in feedbacks between climate change and air quality: a study using an individual‐based model

Wang

Shuman

Shugart

et al. 2018

Ecological Applications

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Air quality is closely associated with climate change via the biosphere because plants release large quantities of volatile organic compounds (VOC) that mediate both gaseous pollutants and aerosol dynamics. Earlier studies, which considered only leaf physiology and simply scale up from leaf-level enhancements of emissions, suggest that climate warming enhances whole forest VOC emissions, and these increased VOC emissions aggravate ozone pollution and secondary organic aerosol formation. Using an individual-based forest VOC emissions model, UVAFME-VOC, that simulates system-level emissions by explicitly simulating forest community dynamics to the individual tree level, ecological competition among the individuals of differing size and age, and radiative transfer and leaf function through the canopy, we find that climate warming only sometimes stimulates isoprene emissions (the single largest source of non-methane hydrocarbon) in a southeastern U.S. forest. These complex patterns result from the combination of higher temperatures' stimulating emissions at the leaf level but decreasing the abundance of isoprene-emitting taxa at the community level by causing a decline in the abundance of isoprene-emitting species (Quercus spp.). This ecological effect eventually outweighs the physiological one, thus reducing overall emissions. Such reduced emissions have far-reaching implications for the climate-air-quality relationships that have been established on the paradigm of warming-enhancement VOC emissions from vegetation. This local scale modeling study suggests that community ecology rather than only individual physiology should be integrated into future studies of biosphere-climate-chemistry interactions.

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Increased water use efficiency leads to decreased precipitation sensitivity of tree growth, but is offset by high temperatures

et al. 2021

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Both increases in temperature and changes in precipitation may limit future tree growth, but rising atmospheric CO2 could offset some of these stressors through increased plant Water Use Efficiency (WUE). The net balance between the negative impacts of climate change and positive effects of CO2 on tree growth is crucial for ecotones, where increased climate stress could drive mortality and shifts in range. Here, we quantify the effects of climate, stand structure, and rising CO2 on both annual tree-ring growth increment and intrinsic WUE (iWUE) at a savanna-forest boundary in the Upper Midwest United States. Taking a Bayesian hierarchical modelling approach, we find that plant iWUE increased by ~ 16–23% over the course of the twentieth century, but on average, tree-ring growth increments do not significantly increase. Consistent with higher iWUE under increased CO2 and recent wetting, we observe a decrease in sensitivity of tree growth to annual precipitation, leading to ~ 35–41% higher growth under dry conditions compared to trees of similar size in the past. However, an emerging interaction between summer maximum temperatures and annual precipitation diminishes the water-savings benefit under hot and dry conditions. This decrease in precipitation sensitivity, and the interaction between temperature and precipitation are strongest in open canopy microclimates, suggesting that stand structure may modulate response to future changes. Overall, while higher iWUE may provide some water savings benefits to growth under normal drought conditions, near-term future temperature increases combined with drought events could drive growth declines of about 50%.

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Interactions between temperature and intercellular CO₂ concentration in controlling leaf isoprene emission rates

Cited by 21 publications

References 54 publications

Effects of ozone on isoprene emission from two major <i>Quercus</i> species native to East Asia

Effects of ozone on isoprene emission from two major <i>Quercus</i> species native to East Asia

Biodiversity matters in feedbacks between climate change and air quality: a study using an individual‐based model

Increased water use efficiency leads to decreased precipitation sensitivity of tree growth, but is offset by high temperatures

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