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Dias SL, Chuang L, Liu S, Seligmann B, Brendel FL, Chavez BG, Hoffie RE, Hoffie I, Kumlehn J, Bültemeier A, Wolf J, Herde M, Witte CP, D'Auria JC, Franke J. Biosynthesis of the allelopathic alkaloid gramine in barley by a cryptic oxidative rearrangement. Science 2024; 383:1448-1454. [PMID: 38547266 DOI: 10.1126/science.adk6112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 02/26/2024] [Indexed: 04/02/2024]
Abstract
The defensive alkaloid gramine not only protects barley and other grasses from insects but also negatively affects their palatability to ruminants. The key gene for gramine formation has remained elusive, hampering breeding initiatives. In this work, we report that a gene encoding cytochrome P450 monooxygenase CYP76M57, which we name AMI synthase (AMIS), enables the production of gramine in Nicotiana benthamiana, Arabidopsis thaliana, and Saccharomyces cerevisiae. We reconstituted gramine production in the gramine-free barley (Hordeum vulgare) variety Golden Promise and eliminated it from cultivar Tafeno by Cas-mediated gene editing. In vitro experiments unraveled that an unexpected cryptic oxidative rearrangement underlies this noncanonical conversion of an amino acid to a chain-shortened biogenic amine. The discovery of the genetic basis of gramine formation now permits tailor-made optimization of gramine-linked traits in barley by plant breeding.
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Affiliation(s)
- Sara Leite Dias
- Department of Molecular Genetics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Seeland OT Gatersleben, Germany
| | - Ling Chuang
- Institute of Botany, Leibniz University Hannover, Herrenhäuser Straße 2, 30419 Hannover, Germany
- Centre of Biomolecular Drug Research, Leibniz University Hannover, Schneiderberg 38, 30167 Hannover, Germany
| | - Shenyu Liu
- Institute of Botany, Leibniz University Hannover, Herrenhäuser Straße 2, 30419 Hannover, Germany
- Centre of Biomolecular Drug Research, Leibniz University Hannover, Schneiderberg 38, 30167 Hannover, Germany
| | - Benedikt Seligmann
- Institute of Botany, Leibniz University Hannover, Herrenhäuser Straße 2, 30419 Hannover, Germany
| | - Fabian L Brendel
- Department of Molecular Genetics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Seeland OT Gatersleben, Germany
| | - Benjamin G Chavez
- Department of Molecular Genetics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Seeland OT Gatersleben, Germany
| | - Robert E Hoffie
- Department of Physiology and Cell Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Seeland OT Gatersleben, Germany
| | - Iris Hoffie
- Department of Physiology and Cell Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Seeland OT Gatersleben, Germany
| | - Jochen Kumlehn
- Department of Physiology and Cell Biology, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Seeland OT Gatersleben, Germany
| | - Arne Bültemeier
- Institute of Botany, Leibniz University Hannover, Herrenhäuser Straße 2, 30419 Hannover, Germany
- Centre of Biomolecular Drug Research, Leibniz University Hannover, Schneiderberg 38, 30167 Hannover, Germany
| | - Johanna Wolf
- Institute of Botany, Leibniz University Hannover, Herrenhäuser Straße 2, 30419 Hannover, Germany
| | - Marco Herde
- Department of Molecular Nutrition and Biochemistry of Plants, Leibniz University Hannover, Herrenhäuser Straße 2, 30419 Hannover, Germany
| | - Claus-Peter Witte
- Department of Molecular Nutrition and Biochemistry of Plants, Leibniz University Hannover, Herrenhäuser Straße 2, 30419 Hannover, Germany
| | - John C D'Auria
- Department of Molecular Genetics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Seeland OT Gatersleben, Germany
| | - Jakob Franke
- Institute of Botany, Leibniz University Hannover, Herrenhäuser Straße 2, 30419 Hannover, Germany
- Centre of Biomolecular Drug Research, Leibniz University Hannover, Schneiderberg 38, 30167 Hannover, Germany
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Hisano H, Hoffie RE, Abe F, Munemori H, Matsuura T, Endo M, Mikami M, Nakamura S, Kumlehn J, Sato K. Regulation of germination by targeted mutagenesis of grain dormancy genes in barley. Plant Biotechnol J 2022; 20:37-46. [PMID: 34459083 PMCID: PMC8710902 DOI: 10.1111/pbi.13692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 08/22/2021] [Indexed: 06/13/2023]
Abstract
High humidity during harvest season often causes pre-harvest sprouting in barley (Hordeum vulgare). Prolonged grain dormancy prevents pre-harvest sprouting; however, extended dormancy can interfere with malt production and uniform germination upon sowing. In this study, we used Cas9-induced targeted mutagenesis to create single and double mutants in QTL FOR SEED DORMANCY 1 (Qsd1) and Qsd2 in the same genetic background. We performed germination assays in independent qsd1 and qsd2 single mutants, as well as in two double mutants, which revealed a strong repression of germination in the mutants. These results demonstrated that normal early grain germination requires both Qsd1 and Qsd2 function. However, germination of qsd1 was promoted by treatment with 3% hydrogen peroxide, supporting the notion that the mutants exhibit delayed germination. Likewise, exposure to cold temperatures largely alleviated the block of germination in the single and double mutants. Notably, qsd1 mutants partially suppress the long dormancy phenotype of qsd2, while qsd2 mutant grains failed to germinate in the light, but not in the dark. Consistent with the delay in germination, abscisic acid accumulated in all mutants relative to the wild type, but abscisic acid levels cannot maintain long-term dormancy and only delay germination. Elucidation of mutant allele interactions, such as those shown in this study, are important for fine-tuning traits that will lead to the design of grain dormancy through combinations of mutant alleles. Thus, these mutants will provide the necessary germplasm to study grain dormancy and germination in barley.
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Affiliation(s)
- Hiroshi Hisano
- Institute of Plant Science and ResourcesOkayama UniversityKurashikiJapan
| | - Robert E. Hoffie
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) GaterslebenStadt SeelandGermany
| | | | - Hiromi Munemori
- Institute of Plant Science and ResourcesOkayama UniversityKurashikiJapan
| | - Takakazu Matsuura
- Institute of Plant Science and ResourcesOkayama UniversityKurashikiJapan
| | - Masaki Endo
- Institute of Agrobiological SciencesNAROTsukubaJapan
| | | | | | - Jochen Kumlehn
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK) GaterslebenStadt SeelandGermany
| | - Kazuhiro Sato
- Institute of Plant Science and ResourcesOkayama UniversityKurashikiJapan
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Hisano H, Abe F, Hoffie RE, Kumlehn J. Targeted genome modifications in cereal crops. Breed Sci 2021; 71:405-416. [PMID: 34912167 PMCID: PMC8661484 DOI: 10.1270/jsbbs.21019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 04/13/2021] [Indexed: 05/15/2023]
Abstract
The recent advent of customizable endonucleases has led to remarkable advances in genetic engineering, as these molecular scissors allow for the targeted introduction of mutations or even precisely predefined genetic modifications into virtually any genomic target site of choice. Thanks to its unprecedented precision, efficiency, and functional versatility, this technology, commonly referred to as genome editing, has become an effective force not only in basic research devoted to the elucidation of gene function, but also for knowledge-based improvement of crop traits. Among the different platforms currently available for site-directed genome modifications, RNA-guided clustered regularly interspaced short palindromic repeats (CRISPR)-associated (Cas) endonucleases have proven to be the most powerful. This review provides an application-oriented overview of the development of customizable endonucleases, current approaches to cereal crop breeding, and future opportunities in this field.
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Affiliation(s)
- Hiroshi Hisano
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Okayama 710-0046, Japan
| | - Fumitaka Abe
- Institute of Crop Science, National Agriculture and Food Research Organization, Tsukuba, Ibaraki 305-8518, Japan
| | - Robert E. Hoffie
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), D-06466 Stadt Seeland/OT Gatersleben, Germany
| | - Jochen Kumlehn
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), D-06466 Stadt Seeland/OT Gatersleben, Germany
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