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Free air CO2 enrichment (FACE) improves water use efficiency and moderates drought effect on N2 fixation of Pisum sativum L.

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Abstract

Background and aims

Legume N2 fixation is highly sensitive to drought. Elevated [CO2] (e[CO2]) decreases stomatal conductance (gs) and improves water use efficiency (WUE), which may result in soil water conservation and allow N2 fixation to continue longer under drought. Using a Free-Air CO2 Enrichment (FACE) approach, this study aimed to elucidate whether e[CO2] improves N2 fixation of Pisum sativum L. under drought.

Methods

In a FACE system, plants were grown in ambient [CO2] (~400 ppm) or e[CO2] (~550 ppm) and subjected to either terminal drought or well-watered treatments. Measurements were taken of photosynthesis, soil water dynamics, water soluble carbohydrates (WSC), amino acids (AA) and N2 fixation.

Results

Lower gs under e[CO2] increased water use efficiency at leaf and plant level, and this translated to slower soil water depletion during drought. Elevated [CO2] increased WSC and decreased total AA concentrations in nodules, and increased nodule activity under drought. N2 fixation was stimulated (+51%) by e[CO2] in proportion to biomass changes. Under e[CO2] a greater proportion of plant total N was derived from fixed N2 and a smaller proportion from soil N uptake compared to a[CO2].

Conclusion

This study suggests that e[CO2] increased WUE and this resulted in slower soil water depletion, allowing pea plants to maintain greater nodule activity under drought and resulting in appreciable increases in N2 fixation. Our results suggest that growth under e[CO2] can mitigate drought effects on N2 fixation and reduce dependency on soil N resources especially in water-limited agro-ecosystems.

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Abbreviations

FACE:

Free-Air CO2 Enrichment

[CO2]:

CO2 concentration

e[CO2]:

Elevated [CO2]

a[CO2]:

Ambient [CO2]

WUE:

Water use efficiency

[N]:

N concentration

%Ndfa:

Percentage of N2 derived from atmosphere

%Nds:

Percentage of N derived from soil

NO3 :

Nitrate

W:

Water regimes

Asat :

Light saturated net CO2 assimilation rate

gs :

Stomatal conductance

WUEi:

Intrinsic water use efficiency

WUEbiomass :

Water-use efficiency based on biomass

RWC:

Relative water content

WSC:

Water soluble carbohydrate

AA:

Amino acids

WW:

Well-watered

DT:

Drought

References

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Acknowledgements

The SoilFACE facility was part of the Australian Grains Free Air CO2 Enrichment (AGFACE) program, which was jointly run by Agriculture Victoria and the University of Melbourne with funding from the Grains Research and Development Corporation and the Australian Commonwealth Department of Agriculture and Water Resources. We gratefully acknowledge Mahabubur Mollah (Agriculture Victoria) for operating the FACE technology and Sam Henty, Russel Argall, Mel Munn and other field team members for managing the field experiments. We are thankful to Shu Kee Lam for pre-submission review of the manuscript and useful comments, Maryse Bourgault for helpful suggestions during the experiment, Markus Löw for assisting with statistical analysis using R and Samuel Poynter for stable isotope analysis using the platform of Trace Analysis for Chemical, Earth and Environmental Science (TrACEES, University of Melbourne). First author acknowledges support by a Melbourne International Research Scholarship.

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Correspondence to Shahnaj Parvin.

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Responsible Editor: Euan K. James.

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Parvin, S., Uddin, S., Fitzgerald, G.J. et al. Free air CO2 enrichment (FACE) improves water use efficiency and moderates drought effect on N2 fixation of Pisum sativum L.. Plant Soil 436, 587–606 (2019). https://doi.org/10.1007/s11104-019-03949-7

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  • DOI: https://doi.org/10.1007/s11104-019-03949-7

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