Optimized barley phytase gene expression by focused FIND-IT screening for mutations in cis-acting regulatory elements

Madsen, Claus Krogh, Brearley, Charles Alistair ORCID: https://orcid.org/0000-0001-6179-9109, Harholt, Jesper and Brinch-Pedersen, Henrik A. (2024) Optimized barley phytase gene expression by focused FIND-IT screening for mutations in cis-acting regulatory elements. Frontiers in Plant Science, 15. ISSN 1664-462X

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Introduction: Induced modification of plant gene expression is of both fundamental and applied importance. Cis-acting regulatory elements (CREs) are major determinants of the spatiotemporal strength of gene expression. Yet, there are few examples where induced genetic variation in predetermined CREs has been exploited to improve or investigate crop plants. Methods: The digital PCR based FIND-IT technology was applied to discover barley mutants with CRE variants in the promoter of the nutritional important barley grain phytase (PAPhy_a) gene. Results and discussion: Mutants with higher or lower gene expression and ultimately higher or lower mature grain phytase activity (MGPA), respectively, were discovered. Field trials and inositol phosphate profiling during germination showed that PAPhy_a does not influence agronomic performance under the trial conditions but it does shorten the lag time of phosphate mobilization during germination. Higher endogenous MGPA is an improvement of grain quality for feed use as it improves the phosphate bioavailability for monogastric animals. Moreover, as the targeted CRE motifs of the PAPhy_a promoter are shared with a range of seed expressed genes like key cereal and legume storage genes, the current results demonstrates a concept for modulating individual gene expression levels of a range of seed genes.

Item Type: Article
Additional Information: Funding information: The author(s) declare that financial support was received for the research, authorship, and/or publication of this article. The work was funded by grant No, 6150-00001A “Lessismore, sustainable intensification of barley production” by Innovation Fund Denmark. The Carlsberg Foundation is gratefully acknowledged for support to JH.
Faculty \ School: Faculty of Science > School of Biological Sciences
UEA Research Groups: Faculty of Science > Research Groups > Plant Sciences
Faculty of Science > Research Groups > Molecular Microbiology
Depositing User: LivePure Connector
Date Deposited: 04 Mar 2024 18:30
Last Modified: 08 Mar 2024 12:32
URI: https://ueaeprints.uea.ac.uk/id/eprint/94483
DOI: 10.3389/fpls.2024.1372049

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