Can elevated CO2 buffer the effects of heat waves on wheat in a dryland cropping system?

Macabuhay, Allene; Houshmandfar, Alireza; Nuttall, James G.; Fitzgerald, Glenn J.; Tausz, Michael; Tausz‐Posch, Sabine

doi:10.1016/j.envexpbot.2018.07.029

Cited by 29 publications

(29 citation statements)

References 65 publications

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“…2004) or stems in wheat ( Triticum aestivum ; Macabuhay et al . ). Phloem loading strategies may affect the ability to export carbohydrates from leaves, and species with different phloem loading strategies may be differently prone to photosynthetic acclimation (Bishop et al .…”

Section: Acclimation To Co2mentioning

confidence: 97%

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Elevated [CO₂] effects on crops: Advances in understanding acclimation, nitrogen dynamics and interactions with drought and other organisms

2019

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Future rapid increases in atmospheric CO 2 concentration [CO 2 ] are expected, with values likely to reach~550 ppm by mid-century. This implies that every terrestrial plant will be exposed to nearly 40% more of one of the key resources determining plant growth. In this review we highlight selected areas of plant interactions with elevated [CO 2 ] (e[CO 2 ]), where recently published experiments challenge long-held, simplified views. Focusing on crops, especially in more extreme and variable growing conditions, we highlight uncertainties associated with four specific areas. (1) While it is long known that photosynthesis can acclimate to e[CO 2 ], such acclimation is not consistently observed in field experiments. The influence of sink-source relations and nitrogen (N) limitation on acclimation is investigated and current knowledge about whether stomatal function or mesophyll conductance (g m ) acclimate independently is summarised.(2) We show how the response of N uptake to e[CO 2 ] is highly variable, even for one cultivar grown within the same field site, and how decreases in N concentrations ([N]) are observed consistently. Potential mechanisms contributing to [N] decreases under e[CO 2 ] are discussed and proposed solutions are addressed. (3) Based on recent results from crop field experiments in highly variable, non-irrigated, waterlimited environments, we challenge the previous opinion that the relative CO 2 effect is larger under drier environmental conditions. (4) Finally, we summarise how changes in growth and nutrient concentrations due to e[CO 2 ] will influence relationships between crops and weeds, herbivores and pathogens in agricultural systems.

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Section: Acclimation To Co2mentioning

confidence: 97%

“…2017b; Macabuhay et al . ). Changes in relative expression of related genes over the critical grain filling period, however, do suggest alterations in N and C metabolism during the grain‐filling process (Buchner et al .…”

Section: Nitrogen Relations Under Elevated [Co2]mentioning

confidence: 97%

Elevated [CO₂] effects on crops: Advances in understanding acclimation, nitrogen dynamics and interactions with drought and other organisms

2019

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“…Studies considering acute HS alone (Stone and Nicolas, 1994, 1996, 1998) or with eCO 2 focused mainly on biomass or yield and not the underlying physiological processes such as photosynthesis. Only a few studies have considered the interactive effects of eCO 2 and HS on wheat photosynthesis (Wang et al, 2008, 2011; Shanmugam et al , 2013; Macabuhay et al , 2018). These studies emphasize the need to determine the impacts of HS application at the vegetative and the important reproductive stage.…”

Section: Introductionmentioning

confidence: 99%

“…The FACE (free-air CO 2 enrichment) study by Fitzgerald et al (2016) in wheat relied on natural heat waves during the reproductive stage and highlighted the need for controlled-environment experiments in order to carefully investigate the interactive effects of eCO 2 and HS on wheat productivity. The only FACE study with wheat by Macabuhay et al (2018) involved controlled heat stress along with eCO 2 and concluded that eCO 2 may moderate some effects of HS on wheat grain yield, but such effects strongly depend on seasonal conditions and timing of HS. The limited number of studies highlight the gap in our understanding of how processes underlying wheat yield respond to the interactive effects of eCO 2 and HS.…”

Section: Introductionmentioning

confidence: 99%

Elevated CO2 alleviates the negative impact of heat stress on wheat physiology but not on grain yield

Chavan

Duursma

Tausz

et al. 2019

Journal of Experimental Botany

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“…Increasing canopy temperature of soybean speeds up the loss of leaf chlorophyll under e[CO 2 ] (Long et al ), corresponding to lower [AA] in leaves under the heat wave in our study. These results encompass the possibility that e[CO 2 ] enhanced faster leaf N translocation into grain when exposed to a heat wave, and this could help to partially improve grain N/protein concentration (Macabuhay et al ).…”

Section: Discussionmentioning

confidence: 63%

Effect of heat wave on N₂ fixation and N remobilisation of lentil (Lens culinaris MEDIK) grown under free air CO₂ enrichment in a mediterranean‐type environment

et al. 2019

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The stimulatory effect of elevated [CO 2 ] (e[CO 2 ]) on crop production in future climates is likely to be cancelled out by predicted increases in average temperatures. This effect may become stronger through more frequent and severe heat waves, which are predicted to increase in most climate change scenarios. Whilst the growth and yield response of some legumes grown under the interactive effect of e[CO 2 ] and heat waves has been studied, little is known about how N 2 fixation and overall N metabolism is affected by this combination.• To address these knowledge gaps, two lentil genotypes were grown under ambient [CO 2 ] (a[CO 2 ],~400 µmolÁmol À1 ) and e[CO 2 ] (~550 µmolÁmol À1 ) in the Australian Grains Free Air CO 2 Enrichment facility and exposed to a simulated heat wave (3-day periods of high temperatures~40°C) at flat pod stage. Nodulation and concentrations of water-soluble carbohydrates (WSC), total free amino acids, N and N 2 fixation were assessed following the imposition of the heat wave until crop maturity.• Elevated [CO 2 ] stimulated N 2 fixation so that total N 2 fixation in e[CO 2 ]-grown plants was always higher than in a[CO 2 ], non-stressed control plants. Heat wave triggered a significant decrease in active nodules and WSC concentrations, but e[CO 2 ] had the opposite effect. Leaf N remobilization and grain N improved under interaction of e[CO 2 ] and heat wave.• These results suggested that larger WSC pools and nodulation under e[CO 2 ] can support post-heat wave recovery of N 2 fixation. Elevated [CO 2 ]-induced accelerated leaf N remobilisation might contribute to restore grain N concentration following a heat wave.

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Can elevated CO2 buffer the effects of heat waves on wheat in a dryland cropping system?

Cited by 29 publications

References 65 publications

Elevated [CO₂] effects on crops: Advances in understanding acclimation, nitrogen dynamics and interactions with drought and other organisms

Elevated [CO₂] effects on crops: Advances in understanding acclimation, nitrogen dynamics and interactions with drought and other organisms

Elevated CO2 alleviates the negative impact of heat stress on wheat physiology but not on grain yield

Effect of heat wave on N₂ fixation and N remobilisation of lentil (Lens culinaris MEDIK) grown under free air CO₂ enrichment in a mediterranean‐type environment

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Can elevated CO2 buffer the effects of heat waves on wheat in a dryland cropping system?

Cited by 29 publications

References 65 publications

Elevated [CO2] effects on crops: Advances in understanding acclimation, nitrogen dynamics and interactions with drought and other organisms

Elevated [CO2] effects on crops: Advances in understanding acclimation, nitrogen dynamics and interactions with drought and other organisms

Elevated CO2 alleviates the negative impact of heat stress on wheat physiology but not on grain yield

Effect of heat wave on N2 fixation and N remobilisation of lentil (Lens culinaris MEDIK) grown under free air CO2 enrichment in a mediterranean‐type environment

Contact Info

Product

Resources

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Elevated [CO₂] effects on crops: Advances in understanding acclimation, nitrogen dynamics and interactions with drought and other organisms

Elevated [CO₂] effects on crops: Advances in understanding acclimation, nitrogen dynamics and interactions with drought and other organisms

Effect of heat wave on N₂ fixation and N remobilisation of lentil (Lens culinaris MEDIK) grown under free air CO₂ enrichment in a mediterranean‐type environment