As carbon dioxide rises, food quality will decline without careful nitrogen management

Bloom, Arnold J.

doi:10.3733/ca.v063n02p67

Cited by 28 publications

(21 citation statements)

References 37 publications

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“…Photorespiration has been linked to increased nitrogen uptake capacity (Rachmilevitch et al, 2004;Bloom et al, 2010Bloom et al, , 2012Bloom et al, , 2014Dellero et al, 2015;Busch et al, 2018), particularly nitrate, posing the question of whether rising CO 2 may reduce plant nitrogen uptake when nitrate is the main nitrogen source available. This is particularly relevant for crop yield, because nitrate is the dominant soil nitrogen source for most crop plants in cultivated aerated soils (Crawford & Glass, 1998;Hawkesford et al, 2012); by reducing nitrate assimilation, rising CO 2 concentrations may also threaten food quality by depleting crop protein concentrations (Bloom, 2009;Carlisle et al, 2012). Cheng et al (2012) showed that, across a range of studies, elevated CO 2 lowered nitrate uptake capacity by 16%, but had no impact on NH 4 + use.…”

Section: Rising Atmospheric Co 2 and Carbon Metabolismmentioning

confidence: 99%

Plant carbon metabolism and climate change: elevated CO₂ and temperature impacts on photosynthesis, photorespiration and respiration

2018

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Contents Summary 32 I. The importance of plant carbon metabolism for climate change 32 II. Rising atmospheric CO2 and carbon metabolism 33 III. Rising temperatures and carbon metabolism 37 IV. Thermal acclimation responses of carbon metabolic processes can be best understood when studied together 38 V. Will elevated CO2 offset warming-induced changes in carbon metabolism? 40 VI. No plant is an island: water and nutrient limitations define plant responses to climate drivers 41 VII. Conclusions 42 Acknowledgements 42 References 42 Appendix A1 48 SUMMARY: Plant carbon metabolism is impacted by rising CO concentrations and temperatures, but also feeds back onto the climate system to help determine the trajectory of future climate change. Here we review how photosynthesis, photorespiration and respiration are affected by increasing atmospheric CO concentrations and climate warming, both separately and in combination. We also compile data from the literature on plants grown at multiple temperatures, focusing on net CO assimilation rates and leaf dark respiration rates measured at the growth temperature (A and R , respectively). Our analyses show that the ratio of A to R is generally homeostatic across a wide range of species and growth temperatures, and that species that have reduced A at higher growth temperatures also tend to have reduced R , while species that show stimulations in A under warming tend to have higher R in the hotter environment. These results highlight the need to study these physiological processes together to better predict how vegetation carbon metabolism will respond to climate change.

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Section: Rising Atmospheric Co 2 and Carbon Metabolismmentioning

confidence: 99%

Plant carbon metabolism and climate change: elevated CO₂ and temperature impacts on photosynthesis, photorespiration and respiration

2018

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“…In the case of soybean, CO 2 enrichment environments (between 550 and 700 molCO 2 mol -1 ) has shown increased photosynthesis by up to ~30% (Griffin and Luo, 1999;Rogers et al, 2004;Bernacchi et al, 2005;Prior et al, 2011), and yield by up to 13% Long et al, 2006). However, increases in photosynthetic rates can be smaller under longterm exposure to high CO 2 due to photosynthetic acclimation (Bernacchi et al 2005;Bloom, 2009). It should be noticed that higher photosynthesis does not necessarily indicate increased productivity because the yield depends ultimately on the biomass partitioning and harvest index (Richards, 2000).…”

Section: Introductionmentioning

confidence: 99%

Response of soybean yield components and allocation of dry matter to increased temperature and CO2 concentration

Pereira-Flores¹,

Justino²,

Ruiz‐Vera³

et al. 2016

Aust J Crop Sci

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Future climatic scenarios can influence crop yield levels and induce hunger if no actions are taken. In this study, we evaluated the effect of increased temperature and CO 2 concentration on soybean yield components and biomass partitioning, that ultimately determine the crops productivity. This is conducted for two soybean genotypes that differ in their canopy and life cycles. Experiments were set as follows: a) T1 -ambient temperature and 390 molCO 2 •mol -1 , b) T2 -ambient air temperature +2.7 o C and ambient CO2, and c) T3 -ambient air temperature + 2.7 o C and 750 molCO 2 •mol -1 . Results indicate that soybean under elevated CO 2 and temperature (T3), were taller and grains weighed more than under the ambient conditions in both cultivars types. However, yield has not increased substantially due to reductions in the ratio of number of branch/plant, pods/branch and grains/branch which lead also to a lesser number of total pods and grains per plant. The increase of temperature favored the number of pods and grains on branches in the modern type cultivar, and on racemes in the old cultivar. This results in more yield in both cultivars versus plants grown in the current ambient, and higher CO 2 concentration plus temperature. In both cultivars, the pods and grains partition were higher on the ontogenically oldest four branches and racemes, with decrease in the other upper ones. In addition, the biomass allocation in vegetative tissues was higher than reproductive biomass, with intensity cultivar dependent. We concluded that in future the yield could be limited by reduction of the numbers of branches and racemes in plant, and by alteration at source-sink relation, thus, indicating that changes in canopy architecture are needed to better take advantage of the increasing concentration of CO 2 .

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“…If impaired nitrate reduction is a reason for declining tissue N concentrations then meeting N needs through ammonium NH 4 + could alleviate the problem. It has been suggested that ammonium-based fertilisers or the use of nitrification inhibitors (to avoid conversion of ammonia into nitrate in the soil) could be considered, provided NH 4 + toxicity and detrimental effects on soils can be managed (Bloom 2009). A recent study seems to corroborate this hypothesis because plants supplied with NH 4 + as an N source showed better responses to elevated [CO 2 ] than those supplied with NO 3 À (Carlisle et al 2012).…”

Section: Decreased Nitrate Reductionmentioning

confidence: 99%

Nutrient Use Efficiency in Plants

Hawkesford¹,

Kok²

2014

Plant Ecophysiology

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Aims & Scope:The Springer Series in Plant Ecophysiology comprises a series of volumes that deals with the impact of biotic and abiotic factors on plant functioning and physiological adaptation to the environment. The aim of the Plant Ecophysiology series is to review and integrate the present knowledge on the impact of the environment on plant functioning and adaptation at various levels: from the molecular, biochemical and physiological to a whole plant level. This series is of interest to scientists who like to be informed of new developments and insights in plant ecophysiology, and can be used as advanced textbooks for biology students.More information about this series at

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As carbon dioxide rises, food quality will decline without careful nitrogen management

Cited by 28 publications

References 37 publications

Plant carbon metabolism and climate change: elevated CO₂ and temperature impacts on photosynthesis, photorespiration and respiration

Plant carbon metabolism and climate change: elevated CO₂ and temperature impacts on photosynthesis, photorespiration and respiration

Response of soybean yield components and allocation of dry matter to increased temperature and CO2 concentration

Nutrient Use Efficiency in Plants

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As carbon dioxide rises, food quality will decline without careful nitrogen management

Cited by 28 publications

References 37 publications

Plant carbon metabolism and climate change: elevated CO2 and temperature impacts on photosynthesis, photorespiration and respiration

Plant carbon metabolism and climate change: elevated CO2 and temperature impacts on photosynthesis, photorespiration and respiration

Response of soybean yield components and allocation of dry matter to increased temperature and CO2 concentration

Nutrient Use Efficiency in Plants

Contact Info

Product

Resources

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Plant carbon metabolism and climate change: elevated CO₂ and temperature impacts on photosynthesis, photorespiration and respiration

Plant carbon metabolism and climate change: elevated CO₂ and temperature impacts on photosynthesis, photorespiration and respiration