Countering elevated CO 2 induced Fe and Zn reduction in Arabidopsis seeds.

Authors :: Sun P
Isner JC
Coupel-Ledru A
Zhang Q
Pridgeon AJ
He Y
Menguer PK
Miller AJ
Sanders D
Mcgrath SP
Noothong F
Liang YK
Hetherington AM
Source :: The New phytologist [New Phytol] 2022 Sep; Vol. 235 (5), pp. 1796-1806. Date of Electronic Publication: 2022 Jun 24.
Publication Year :: 2022
Abstract: Growth at increased concentrations of CO <subscript>2</subscript> induces a reduction in seed zinc (Zn) and iron (Fe). Using Arabidopsis thaliana, we investigated whether this could be mitigated by reducing the elevated CO <subscript>2</subscript> -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 CO <subscript>2</subscript> . ACA7 is expressed in guard cells. When aca7 mutants are grown at 1000 ppm CO <subscript>2</subscript> 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 CO <subscript>2</subscript> .<br /> (© 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation.)