Modelling stomatal conductance of wheat: An assessment of response relationships under elevated CO2

Houshmandfar, Alireza; Fitzgerald, Glenn J.; Armstrong, Roger; Macabuhay, Allene; Tausz, Michael

doi:10.1016/j.agrformet.2015.08.249

Cited by 23 publications

(18 citation statements)

References 57 publications

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“…In contrast, previous and current studies showed elevated CO 2 increased RWC (Fig. 1) by reducing the stomatal and mesophyll conductance and transpiration (Zong and Shangguan 2014;Houshmandfar et al 2015;Sekhar et al 2015). A s a result, the tissue dehydration was alleviated, and the C uploading in phloem was enhanced.…”

Section: Elevated Co 2 Enhances the C Supply For New Leaf Growth And contrasting

confidence: 58%

Increased sink capacity enhances C and N assimilation under drought and elevated CO2 conditions in maize

Zong

2016

Journal of Integrative Agriculture

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The maintenance of rapid growth under conditions of CO 2 enrichment is directly related to the capacity of new leaves to use or store the additional assimilated carbon (C) and nitrogen (N). Under drought conditions, however, less is known about C and N transport in C 4 plants and the contributions of these processes to new foliar growth. We measured the patterns of C and N accumulation in maize (Zea mays L.) seedlings using 13 C and 15 N as tracers in CO 2 climate chambers (380 or 750 µmol mol-1) under a mild drought stress induced with 10% PEG-6000. The drought stress under ambient conditions decreased the biomass production of the maize plants; however, this effect was reduced under elevated CO 2. Compared with the water-stressed maize plants under atmospheric CO 2 , the treatment that combined elevated CO 2 with water stress increased the accumulation of biomass, partitioned more C and N to new leaves as well as enhanced the carbon resource in ageing leaves and the carbon pool in new leaves. However, the C counterflow capability of the roots decreased. The elevated CO 2 increased the time needed for newly acquired N to be present in the roots and increased the proportion of new N in the leaves. The maize plants supported the development of new leaves at elevated CO 2 by altering the transport and remobilization of C and N. Under drought conditions, the increased activity of new leaves in relation to the storage of C and N sustained the enhanced growth of these plants under elevated CO 2 .

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Section: Elevated Co 2 Enhances the C Supply For New Leaf Growth And contrasting

confidence: 58%

Increased sink capacity enhances C and N assimilation under drought and elevated CO2 conditions in maize

Zong

2016

Journal of Integrative Agriculture

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“…Monthly averaged stomata conductance ( g s ) (mol m −2 s −1 ) under a[CO 2 ] (open circles) and e[CO 2 ] (filled circles) estimated using a Jarvis‐type model developed at this site (Houshmandfar et al ) (A). Cumulative transpiration estimates (± se ) from germination until DC31, DC34, DC65 and DC69 in wheat grown under FACE conditions (a[CO 2 ]: open squares; e[CO 2 ]: filled squares) (B).…”

Section: Resultsmentioning

confidence: 99%

“…Yitpi and cv. Scout) (Houshmandfar et al 2015a). Stomatal conductance was on average 27% lower under elevated than under ambient CO 2 .…”

Section: Discussionmentioning

confidence: 99%

The relationship between transpiration and nutrient uptake in wheat changes under elevated atmospheric CO₂

Houshmandfar

Fitzgerald

O'Leary

et al. 2018

Physiologia Plantarum

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The impact of elevated [CO ] (e[CO ]) on crops often includes a decrease in their nutrient concentrations where reduced transpiration-driven mass flow of nutrients has been suggested to play a role. We used two independent approaches, a free-air CO enrichment (FACE) experiment in the South Eastern wheat belt of Australia and a simulation study employing the agricultural production systems simulator (APSIM), to show that transpiration (mm) and nutrient uptake (g m ) of nitrogen (N), potassium (K), sulfur (S), calcium (Ca), magnesium (Mg) and manganese (Mn) in wheat are correlated under e[CO ], but that nutrient uptake per unit water transpired is higher under e[CO ] than under ambient [CO ] (a[CO ]). This result suggests that transpiration-driven mass flow of nutrients contributes to decreases in nutrient concentrations under e[CO ], but cannot solely explain the overall decline.

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“…In apparent contrast, using a Jarvis‐type g s model, which uses independent empirical response functions to multiple environmental factors, Houshmandfar et al . () found that stomata of e[CO 2 ]‐grown wheat responded less sensitively to drying soil, i.e . stomatal closure was initiated earlier – at higher soil water content – under ambient [CO 2 ] than under e[CO 2 ].…”

Section: Acclimation To Co2mentioning

confidence: 99%

“…It is difficult to compare these results directly because the Jarvis‐type model employed by Houshmandfar et al . () uses relative functions (with values between 0 and 1) to scale a maximum (unstressed) conductance ( g max ). In accordance with most other studies, e[CO 2 ] significantly depressed g max in the first place, so that a less sensitive response from this lower g max to drying soil can lead to similar absolute conductance as a more sensitive (stronger) response starting from a larger g max value under ambient [CO 2 ].…”

Section: Acclimation To Co2mentioning

confidence: 99%

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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Modelling stomatal conductance of wheat: An assessment of response relationships under elevated CO2

Cited by 23 publications

References 57 publications

Increased sink capacity enhances C and N assimilation under drought and elevated CO2 conditions in maize

Increased sink capacity enhances C and N assimilation under drought and elevated CO2 conditions in maize

The relationship between transpiration and nutrient uptake in wheat changes under elevated atmospheric CO₂

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

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Modelling stomatal conductance of wheat: An assessment of response relationships under elevated CO2

Cited by 23 publications

References 57 publications

Increased sink capacity enhances C and N assimilation under drought and elevated CO2 conditions in maize

Increased sink capacity enhances C and N assimilation under drought and elevated CO2 conditions in maize

The relationship between transpiration and nutrient uptake in wheat changes under elevated atmospheric CO2

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

Contact Info

Product

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The relationship between transpiration and nutrient uptake in wheat changes under elevated atmospheric CO₂

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