Countering elevated CO2 induced Fe and Zn reduction in Arabidopsis seeds

Peng Sun, Jean Charles Isner, Aude Coupel-Ledru, Qi Zhang, Ashley J. Pridgeon, Yaqian He, Paloma K. Menguer, Anthony J. Miller, Dale Sanders, Steve P. Mcgrath, Fonthip Noothong, Yun Kuan Liang*, Alistair M. Hetherington

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

6 Citations (Scopus)


Growth at increased concentrations of CO2 induces a reduction in seed zinc (Zn) and iron (Fe). Using Arabidopsis thaliana, we investigated whether this could be mitigated by reducing the elevated CO2-induced decrease in transpiration. We used an infrared imaging-based screen to isolate mutants in At1g08080 that encodes ALPHA CARBONIC ANHYDRASE 7 (ACA7). aca7 mutant alleles display wild-type (WT) responses to abscisic acid (ABA) and light but are compromised in their response to elevated CO2. ACA7 is expressed in guard cells. When aca7 mutants are grown at 1000 ppm CO2 they exhibit higher transpiration and higher seed Fe and Zn content than WT grown under the same conditions. Our data show that by increasing transpiration it is possible to partially mitigate the reduction in seed Fe and Zn content when Arabidopsis is grown at elevated CO2.

Original languageEnglish
Pages (from-to)1796-1806
Number of pages11
JournalNew Phytologist
Issue number5
Early online date30 May 2022
Publication statusE-pub ahead of print - 30 May 2022

Bibliographical note

Funding Information:
This work was supported by grants to AMH from the UK Biotechnology and Biological Sciences Research Council (BBSRC), grant no. BB/N001168/1 and the Leverhulme Trust. Y-KL was supported by the National Natural Science Foundation of China under grant no. 31770282. AJP is grateful to the UK Biotechnology and Biological Sciences Research Council for a PhD studentship funded through the South West Biosciences Doctoral Training Partnership (training grant reference: BB/M009122/1). AC-L received an individual Marie Curie Fellowship (MSCA-IF H2020). The CAPES Foundation within the Ministry of Education in Brazil programme ‘Science without Borders’ supported PKM. DS and AJM were supported by grants BB/P004474/1, BB/J00PR9796 and BB/J000PR9799 from the BBSRC and the John Innes Foundation.

Funding Information:
. This research was funded by His Majesty Trust Fund, grant number SR/SCI/CHEM/19/01, and by the Research Council of Tehran University of Medical Sciences

Publisher Copyright:
© 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation.


  • alpha carbonic anhydrases
  • Arabidopsis thaliana
  • CO signalling pathway
  • stomatal function
  • Zn and Fe


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