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  Natural alleles of the abscisic acid catabolism gene ZmAbh4 modulate water use efficiency and carbon isotope discrimination in maize

Blankenagel, S., Eggels, S., Frey, M., Grill, E., Bauer, E., Dawid, C., et al. (2022). Natural alleles of the abscisic acid catabolism gene ZmAbh4 modulate water use efficiency and carbon isotope discrimination in maize. The Plant Cell, koac200. doi:10.1093/plcell/koac200.

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 Creators:
Blankenagel, Sonja1, Author
Eggels, Stella1, Author
Frey, Monika1, Author
Grill, Erwin1, Author
Bauer, Eva1, Author
Dawid, Corinna1, Author
Fernie, A. R.2, Author           
Haberer, Georg1, Author
Hammerl, Richard1, Author
Medeiros, D.B.2, Author           
Ouzunova, Milena1, Author
Presterl, Thomas1, Author
Ruß, Victoria1, Author
Schäufele, Rudi1, Author
Schlüter, Urte1, Author
Tardieu, Francois1, Author
Urbany, Claude1, Author
Urzinger, Sebastian1, Author
Weber, Andreas P M1, Author
Schön, Chris-Carolin1, Author
Avramova, Viktoriya1, Author more..
Affiliations:
1external, ou_persistent22              
2Central Metabolism, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753339              

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 Abstract: Altering plant water use efficiency (WUE) is a promising approach for achieving sustainable crop production in changing climate scenarios. Here, we show that WUE can be tuned by alleles of a single gene discovered in elite maize (Zea mays) breeding material. Genetic dissection of a genomic region affecting WUE led to the identification of the gene ZmAbh4 as causative for the effect. CRISPR/Cas9-mediated ZmAbh4 inactivation increased WUE without growth reductions in well-watered conditions. ZmAbh4 encodes an enzyme that hydroxylates the phytohormone abscisic acid (ABA) and initiates its catabolism. Stomatal conductance is regulated by ABA and emerged as a major link between variation in WUE and discrimination against the heavy carbon isotope (Δ13C) during photosynthesis in the C4 crop maize. Changes in Δ13C persisted in kernel material, which offers an easy-to-screen proxy for WUE. Our results establish a direct physiological and genetic link between WUE and Δ13C through a single gene with potential applications in maize breeding.

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Language(s): eng - English
 Dates: 2022-07-06
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1093/plcell/koac200
 Degree: -

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Title: The Plant Cell
  Abbreviation : Plant C
Source Genre: Journal
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Publ. Info: Rockville : American Society of Plant Physiologists
Pages: - Volume / Issue: - Sequence Number: koac200 Start / End Page: - Identifier: ISSN: 1532-298X
CoNE: https://pure.mpg.de/cone/journals/resource/1532-298X