Elevated CO2 alleviates the impact of drought on barley improving water status by lowering stomatal conductance and delaying its effects on photosynthesis

Robredo, Anabel; Pérez‐López, Usue; Maza, H.; González‐Moro, María Begoña; Lacuesta, M.; Mena‐Petite, Amaia; Muñoz‐Rueda, Alberto

doi:10.1016/j.envexpbot.2006.01.001

Cited by 199 publications

(139 citation statements)

References 69 publications

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“…Photosynthesis is also very sensitive to the direct effects of leaf water deficits measured as more negative W leaf (Lawlor and Tezara, 2009). Therefore, improvements in W leaf at post-glacial compared to glacial pCO 2 in this study indicate that plant water status was more favourable for carbon assimilation, and are consistent with studies finding that leaf W leaf and A are improved under elevated pCO 2 in both C 3 and C 4 plants under water deficits (Wall, 2001;Wall et al, 2001;LeCain et al, 2003;Robredo et al, 2006).…”

Section: Discussionsupporting

confidence: 80%

Reduced plant water status under sub-ambientpCO₂limits plant productivity in the wild progenitors of C₃and C₄cereals

Cunniff

Charles

Jones

et al. 2016

Ann Bot

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Background and Aims The reduction of plant productivity by low atmospheric CO 2 partial pressure (pCO 2 ) during the last glacial period is proposed as a limiting factor for the establishment of agriculture. Supporting this hypothesis, previous work has shown that glacial pCO 2 limits biomass in the wild progenitors of C 3 and C 4 founder crops, in part due to the direct effects of glacial pCO 2 on photosynthesis. Here, we investigate the indirect role of pCO 2 mediated via water status, hypothesizing that faster soil water depletion at glacial (18 Pa) compared to postglacial (27 Pa) pCO 2 , due to greater stomatal conductance, feeds back to limit photosynthesis during drying cycles.Methods We grew four wild progenitors of C 3 and C 4 crops at glacial and post-glacial pCO 2 and investigated physiological changes in gas exchange, canopy transpiration, soil water content and water potential between regular watering events. Growth parameters including leaf area were measured.Key Results Initial transpiration rates were higher at glacial pCO 2 due to greater stomatal conductance. However, stomatal conductance declined more rapidly over the soil drying cycle in glacial pCO 2 and was associated with decreased intercellular pCO 2 and lower photosynthesis. Soil water content was similar between pCO 2 levels as larger leaf areas at post-glacial pCO 2 offset the slower depletion of water. Instead the feedback could be linked to reduced plant water status. Particularly in the C 4 plants, soil-leaf water potential gradients were greater at 18 Pa compared with 27 Pa pCO 2 , suggesting an increased ratio of leaf evaporative demand to supply.Conclusions Reduced plant water status appeared to cause a negative feedback on stomatal aperture in plants at glacial pCO 2 , thereby reducing photosynthesis. The effects were stronger in C 4 species, providing a mechanism for reduced biomass at 18 Pa. These results have added significance when set against the drier climate of the glacial period.

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Section: Discussionsupporting

confidence: 80%

Reduced plant water status under sub-ambientpCO₂limits plant productivity in the wild progenitors of C₃and C₄cereals

Cunniff

Charles

Jones

et al. 2016

Ann Bot

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“…Many studies have shown that increased CO2 values result in decreased stomatal conductance and thus an increase in soil moisture content (e.g. Robredo et al, 2007), however others have suggested that such behaviour is species dependant and that soil moisture can actually decrease due to increased plant growth and root biomass (Moore and Field, 2006). These latter authors also illustrate that under elevated atmospheric CO2 concentrations some species increase the efficiency of their deep roots, extracting a larger percentage of water earlier from deeper intervals.…”

Section: Zone 2bmentioning

confidence: 70%

The impact of a naturally occurring CO2 gas vent on the shallow ecosystem and soil chemistry of a Mediterranean pasture (Latera, Italy)

Beaubien

Ciotoli

Coombs

et al. 2008

International Journal of Greenhouse Gas Control

135

109

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Recent research into C02 geological storage has shown that it has potential to be a safe and effective way to rapidly decrease short-term anthropogenic C02 emissions. Despite this progress, stakeholders must be convinced that the scientific community has studied all possible scenarios, including a potential leak into the biosphere. To better understand the potential impact of such an event, a detailed geochemical and biological study was conducted during two different seasons on a naturally occurring gas vent located within a Mediterranean pasture ecosystem (Latera geothermal field, central Italy). Results from botanical, soil gas, and gas flux surveys, and from chemical and biological analyses of shallow soil samples (0-20 cm depth), show that a significant impact is only observed in the 6 In wide centre of the vent, where C02 flux rates exceed 2000-3000 g M-2 d-1. In this "vent core" there is no vegetation, pH is low (minimum 3.5), and small changes are observed in mineralogy and bulk chemistry. in addition, microbial activities and populations are regulated in this interval by near-anoxic conditions, and by elevated soil gas C02 (>95%) and trace reduced gases (CH4, H2S, and 142). An approximately 20 In wide halo surrounding the core forms a transition zone, over which there is a gradual decrease in C02 concentrations, a rapid decrease in C02 fluxes, and the absence of reactive gas species. In this transition zone grasses dominate near the vent core, but these are progressively replaced by clover and a greater plant diversity moving away from the vent centre. Physical parameters (e.g. pH, bulk chemistry, mineralogy) and microbial systems also gradually return to background values across this transition zone. Results indicate that, even at this anomalous high-flux site, the effects ofthe gas vent are spatially limited and that the ecosystem appears to have adapted to the different conditions through species substitution or adaptation. (c) 2008 Elsevier Ltd. All rights reserved

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“…For example, when different species were grown in wet and dry soils, it was observed that soil water was conserved under elevated [CO 2 ] and that water use efficiency greatly increased under both well-watered and water-stressed conditions [61,62]. When these and similar findings were summarised, it was found that high-[CO 2 ] experiments commonly led to increased water use efficiency, but that plant water loss was not necessarily reduced because high-[CO 2 ] grown plants often had higher leaf areas [63].…”

Section: Small-scale Growth Experimentsmentioning

confidence: 99%

Warming and Elevated CO2 Have Opposing Influences on Transpiration. Which is more Important?

Kirschbaum

McMillan

2018

Curr Forestry Rep

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Plant transpiration is a key component of the terrestrial water cycle, and it is important to understand whether rates are likely to increase or decrease in the future. Plant transpiration rates are affected by biophysical factors, such as air temperature, vapour pressure deficits and net radiation, and by plant factors, such as canopy leaf area and stomatal conductance. Under future climate change, global temperature increases, and associated increases in vapour pressure deficits, will act to increase canopy transpiration rates. Increasing atmospheric CO 2 concentrations, however, is likely to lead to some reduction in stomatal conductance, which will reduce canopy transpiration rates. The objective of the present paper was to quantitatively compare the importance of these opposing driving forces. First, we reviewed the existing literature and list a large range of observations of the extent of decreasing stomatal conductance with increasing CO 2 concentrations. We considered observations ranging from short-term laboratory-based experiments with plants grown under different CO 2 concentrations to studies of plants exposed to the naturally increasing atmospheric CO 2 concentrations. Using these empirical observations of plant responses, and a set of well-tested biophysical relationships, we then estimated the net effect of the opposing influences of warming and CO 2 concentration on transpiration rates. As specific cases studies, we explored expected changes in greater detail for six specific representative locations, covering the range from tropical to boreal forests. For most locations investigated, we calculated reductions in daily transpiration rates over the twenty-first century that became stronger under higher atmospheric CO 2 concentrations. It showed that the effect of CO 2 -induced reduction of stomatal conductance would have a stronger transpiration-depressing effect than the stimulatory effect of future warming. For currently cold regions, global warming would, however, lengthen the growing seasons so that annual sums of transpiration could increase in those regions despite reductions in daily transpiration rates over the summer months.

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Elevated CO2 alleviates the impact of drought on barley improving water status by lowering stomatal conductance and delaying its effects on photosynthesis

Cited by 199 publications

References 69 publications

Reduced plant water status under sub-ambientpCO₂limits plant productivity in the wild progenitors of C₃and C₄cereals

Reduced plant water status under sub-ambientpCO₂limits plant productivity in the wild progenitors of C₃and C₄cereals

The impact of a naturally occurring CO2 gas vent on the shallow ecosystem and soil chemistry of a Mediterranean pasture (Latera, Italy)

Warming and Elevated CO2 Have Opposing Influences on Transpiration. Which is more Important?

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Elevated CO2 alleviates the impact of drought on barley improving water status by lowering stomatal conductance and delaying its effects on photosynthesis

Cited by 199 publications

References 69 publications

Reduced plant water status under sub-ambientpCO2limits plant productivity in the wild progenitors of C3and C4cereals

Reduced plant water status under sub-ambientpCO2limits plant productivity in the wild progenitors of C3and C4cereals

The impact of a naturally occurring CO2 gas vent on the shallow ecosystem and soil chemistry of a Mediterranean pasture (Latera, Italy)

Warming and Elevated CO2 Have Opposing Influences on Transpiration. Which is more Important?

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Reduced plant water status under sub-ambientpCO₂limits plant productivity in the wild progenitors of C₃and C₄cereals

Reduced plant water status under sub-ambientpCO₂limits plant productivity in the wild progenitors of C₃and C₄cereals