Elevated CO2 (free-air CO2 enrichment) increases grain yield of aluminium-resistant but not aluminium-sensitive wheat (Triticum aestivum) grown in an acid soil.
journal contributionposted on 07.01.2021, 03:20 by Jinlong Dong, Stephen Grylls, James Hunt, Roger Armstrong, Emmanuel Delhaize, Caixian Tang
© The Author(s) 2018. Background and Aims Soil acidity currently limits root growth and crop production in many regions, and climate change is leading to uncertainties regarding future food supply. However, it is unknown how elevated CO2 (eCO2) affects the performance of wheat crops in acid soils under field conditions. We investigated the effects of eCO2 on plant growth and yield of three pairs of near-isogenic hexaploid wheat lines differing in alleles of aluminium-resistant genes TaALMT1 (conferring root malate efflux) and TaMATE1B (conferring citrate efflux). • Methods Plants were grown until maturity in an acid soil under ambient CO2 (aCO2; 400 μmol mol-1) and eCO2 (550 μmol mol-1) in a soil free-air CO2 enrichment facility (SoilFACE). Growth parameters and grain yields were measured. • Key Results Elevated CO2 increased grain yield of lines carrying TaMATE1B by 22 % and lines carrying only TaALMT1 by 31 %, but did not increase the grain yield of Al3+-sensitive lines. Although eCO2 promoted tiller formation, coarse root length and root biomass of lines carrying TaMATE1B, it did not affect ear number, and it therefore limited yield potential. By contrast, eCO2 decreased or did not change these parameters for lines carrying only TaALMT1, and enhanced biomass allocation to grains thereby resulting in increased grain yield. Despite TaMATE1B being less effective than TaALMT1 at conferring Al3+ resistance based on root growth, the gene promoted grain yield to a similar level to TaALMT1 when the plants were grown in acid soil. Furthermore, TaALMT1 and TaMATE1B were not additive in their effects. • Conclusions As atmospheric CO2 increases, it is critical that both Al3+-resistance genes (particularly TaALMT1) should be maintained in hexaploid wheat germplasm in order for yield increases from CO2 fertilization to be realized in acid soils.
We thank Mel Munn, Liana Warren, Roger Perris and Russel Argall for management of the SoilFACE experiment. We also acknowledge Dominic Lauricella and James Bennett O'Sullivan for helpful discussion on running field trials and certain technical support. The SoilFACE as part of Australian Grains Free Air CO2 Enrichment programme is run jointly by Agriculture Victoria Research (Victorian State Department of Economic Development, Jobs, Transport and Resources) with the University of Melbourne and funding from the Grains Research and Development Corporation (GRDC) and the Australian Government Department of Agriculture and Water Resources.
JournalAnnals of botany
Pagination8p. (p. 461-468)
PublisherOxford University Press
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Science & TechnologyLife Sciences & BiomedicinePlant SciencesAcid-soil tolerancebiomass allocationgenotypic variationnear-isogenic linesphosphorus deficiencyTaALMT1TaMATE1BATMOSPHERIC CO2CARBON-DIOXIDERICE PRODUCTIONSPRING WHEATTOLERANCEWATERRESPONSESQUALITYEFFLUXACCUMULATIONTriticumCarbon DioxideAluminumCarrier ProteinsPlant ProteinsSoilDrug ResistanceEdible GrainPlant Biology & Botany