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High-Density Mapping and Deployment of the Adult-Plant Stripe Rust Resistance Gene Yr78- [electronic resource]
High-Density Mapping and Deployment of the Adult-Plant Stripe Rust Resistance Gene Yr78- [electronic resource]
상세정보
- 자료유형
- 학위논문
- Control Number
- 0016934985
- International Standard Book Number
- 9798380365024
- Dewey Decimal Classification Number
- 630
- Main Entry-Personal Name
- Dang, Chen.
- Publication, Distribution, etc. (Imprint
- [S.l.] : University of California, Davis., 2023
- Publication, Distribution, etc. (Imprint
- Ann Arbor : ProQuest Dissertations & Theses, 2023
- Physical Description
- 1 online resource(105 p.)
- General Note
- Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
- General Note
- Advisor: Dubcovsky, Jorge.
- Dissertation Note
- Thesis (Ph.D.)--University of California, Davis, 2023.
- Restrictions on Access Note
- This item must not be sold to any third party vendors.
- Summary, Etc.
- 요약Wheat stripe rust, caused by Puccinia striiformis f. sp. tritici (Pst), is responsible for significant yield losses worldwide, which can be minimized by deploying Pst resistance genes. Yr78 is an adult plant resistance gene that has remained effective against the post-2000 virulent Pst races. In this study, we first generated a high-resolution map of Yr78 based on 6,124 segregating chromosomes. Yr78 was mapped in an 11.16 Mb region on the short arm of chromosome 6B, including 15 annotated protein-coding genes in the 'Chinese Spring' Ref Seq. v1.1 genome. Using exome capture data, we yielded five major haplotypes in the candidate gene region, with the H1 haplotype associated with Yr78. The H1 resistant haplotype was identified in Spelt, Cadenza, and Lancer. Especially, 67% of the European Spelt accessions have the H1 haplotype, suggesting its origin from Spelt wheat and the value of sequenced genomes carrying the resistance allele in developing Yr78 precise map.By manually reannotating the non-repetitive regions of the Spelt genome published by the Pan Genome project, we are able to delimit the proximal border of the Yr78 candidate region with new markers developed from the resistance/susceptible haplotype analysis. Besides, luckily we found a natural deletion in a recombinant line R136 from the mapping population, which has a breakpoint within the Yr78 candidate gene region and is resistant against Pst. This deletion line delimits the distal border of the Yr78 candidate region furthermore. And finally, we mapped Yr78 within a 604 kb interval based on the Chinese Spring Ref Seq. v1.1 genome, between CDM164 (CS-6BS 111,985,311 bp) and CDM161(CS-6BS 111,381,697). This new candidate region excludes the previous 15 candidate genes and low confidential genes, and only includes the NOR-B2 locus.The NOR-B2 locus has not been assembled in any of the current wheat genomes due to its highly repetitive nature. Based on the published number of ribosomal genes in chromosome 6BS, the unassembled region in Chinese Spring was estimated to be ~37 Mb. More, we explored in detail the NOR-B2 region by re-analyzing data from three different genomic projects that attempted to provide a better cover of NOR-B2. In spite of all these efforts, we could not find a likely candidate for Yr78. The optical mapping of this region has shown the presence of non-repetitive regions within the NOR-B2 region. We hypothesize that the Yr78 gene is likely located within the non-repetitive regions of this complex and unassembled region of the wheat genome. This result highlights the importance of completing the currently unassembled regions of the wheat genome.Although the unassembled NOR-B2 region limited our ability to identify a candidate gene for Yr78, our precise mapping and detailed haplotype analyses of the region yielded useful tools for the deployment of this valuable resistance gene in wheat breeding programs. We developed two tightly linked molecular markers CDM158 (CS-6BS 106,540,703) and CDM160-2 (CS-6BS 108,227,904) for the H1 haplotype that will facilitate the deployment of Yr78 in wheat breeding programs. In the practice side, we created several valuable germplasms containing Yr78. First, we transferred Yr78 from hexaploid wheat into the tetraploid durum variety Kronos and demonstrated increased Pst resistance 39% IT and 35% SEV in the field test. This germplasm has been submitted to GRIN-Global as 'Kronos-Yr78' assigned as PI 702944. Since Yr78 has not been detected in wild or cultivated tetraploid wheat, this material can be a novel tool to improve Pst resistance in durum wheat. The second genetic stock developed in this thesis includes the combination of the closely linked Pst adult plant resistance genes Yr78 and Yr36 in phase. We successfully screened out the recombinant progenies containing homozygous Yr36+Yr78. So breeders can deploy both genes together using a single set of flanking markers. To increase the value of this germplasm, we developed an additional line with the Yr5 and Yr15 resistance genes in addition to the combined Yr36+Yr78. This germplasm provides a single source of multiple Pst resistance genes for common wheat breeding programs. These lines are currently growing to increase seeds for Pst resistance level test and submission to GRIN-Global.
- Subject Added Entry-Topical Term
- Agriculture.
- Subject Added Entry-Topical Term
- Plant sciences.
- Subject Added Entry-Topical Term
- Plant pathology.
- Index Term-Uncontrolled
- Breeding
- Index Term-Uncontrolled
- Fine mapping
- Index Term-Uncontrolled
- Stripe rust
- Index Term-Uncontrolled
- Germplasms
- Index Term-Uncontrolled
- Puccinia striiformis
- Added Entry-Corporate Name
- University of California, Davis Horticulture and Agronomy
- Host Item Entry
- Dissertations Abstracts International. 85-03B.
- Host Item Entry
- Dissertation Abstract International
- Electronic Location and Access
- 로그인을 한후 보실 수 있는 자료입니다.
- Control Number
- joongbu:640720
MARC
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■00520240214101839
■006m o d
■007cr#unu||||||||
■020 ▼a9798380365024
■035 ▼a(MiAaPQ)AAI30638045
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a630
■1001 ▼aDang, Chen.
■24510▼aHigh-Density Mapping and Deployment of the Adult-Plant Stripe Rust Resistance Gene Yr78▼h[electronic resource]
■260 ▼a[S.l.]▼bUniversity of California, Davis. ▼c2023
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2023
■300 ▼a1 online resource(105 p.)
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-03, Section: B.
■500 ▼aAdvisor: Dubcovsky, Jorge.
■5021 ▼aThesis (Ph.D.)--University of California, Davis, 2023.
■506 ▼aThis item must not be sold to any third party vendors.
■520 ▼aWheat stripe rust, caused by Puccinia striiformis f. sp. tritici (Pst), is responsible for significant yield losses worldwide, which can be minimized by deploying Pst resistance genes. Yr78 is an adult plant resistance gene that has remained effective against the post-2000 virulent Pst races. In this study, we first generated a high-resolution map of Yr78 based on 6,124 segregating chromosomes. Yr78 was mapped in an 11.16 Mb region on the short arm of chromosome 6B, including 15 annotated protein-coding genes in the 'Chinese Spring' Ref Seq. v1.1 genome. Using exome capture data, we yielded five major haplotypes in the candidate gene region, with the H1 haplotype associated with Yr78. The H1 resistant haplotype was identified in Spelt, Cadenza, and Lancer. Especially, 67% of the European Spelt accessions have the H1 haplotype, suggesting its origin from Spelt wheat and the value of sequenced genomes carrying the resistance allele in developing Yr78 precise map.By manually reannotating the non-repetitive regions of the Spelt genome published by the Pan Genome project, we are able to delimit the proximal border of the Yr78 candidate region with new markers developed from the resistance/susceptible haplotype analysis. Besides, luckily we found a natural deletion in a recombinant line R136 from the mapping population, which has a breakpoint within the Yr78 candidate gene region and is resistant against Pst. This deletion line delimits the distal border of the Yr78 candidate region furthermore. And finally, we mapped Yr78 within a 604 kb interval based on the Chinese Spring Ref Seq. v1.1 genome, between CDM164 (CS-6BS 111,985,311 bp) and CDM161(CS-6BS 111,381,697). This new candidate region excludes the previous 15 candidate genes and low confidential genes, and only includes the NOR-B2 locus.The NOR-B2 locus has not been assembled in any of the current wheat genomes due to its highly repetitive nature. Based on the published number of ribosomal genes in chromosome 6BS, the unassembled region in Chinese Spring was estimated to be ~37 Mb. More, we explored in detail the NOR-B2 region by re-analyzing data from three different genomic projects that attempted to provide a better cover of NOR-B2. In spite of all these efforts, we could not find a likely candidate for Yr78. The optical mapping of this region has shown the presence of non-repetitive regions within the NOR-B2 region. We hypothesize that the Yr78 gene is likely located within the non-repetitive regions of this complex and unassembled region of the wheat genome. This result highlights the importance of completing the currently unassembled regions of the wheat genome.Although the unassembled NOR-B2 region limited our ability to identify a candidate gene for Yr78, our precise mapping and detailed haplotype analyses of the region yielded useful tools for the deployment of this valuable resistance gene in wheat breeding programs. We developed two tightly linked molecular markers CDM158 (CS-6BS 106,540,703) and CDM160-2 (CS-6BS 108,227,904) for the H1 haplotype that will facilitate the deployment of Yr78 in wheat breeding programs. In the practice side, we created several valuable germplasms containing Yr78. First, we transferred Yr78 from hexaploid wheat into the tetraploid durum variety Kronos and demonstrated increased Pst resistance 39% IT and 35% SEV in the field test. This germplasm has been submitted to GRIN-Global as 'Kronos-Yr78' assigned as PI 702944. Since Yr78 has not been detected in wild or cultivated tetraploid wheat, this material can be a novel tool to improve Pst resistance in durum wheat. The second genetic stock developed in this thesis includes the combination of the closely linked Pst adult plant resistance genes Yr78 and Yr36 in phase. We successfully screened out the recombinant progenies containing homozygous Yr36+Yr78. So breeders can deploy both genes together using a single set of flanking markers. To increase the value of this germplasm, we developed an additional line with the Yr5 and Yr15 resistance genes in addition to the combined Yr36+Yr78. This germplasm provides a single source of multiple Pst resistance genes for common wheat breeding programs. These lines are currently growing to increase seeds for Pst resistance level test and submission to GRIN-Global.
■590 ▼aSchool code: 0029.
■650 4▼aAgriculture.
■650 4▼aPlant sciences.
■650 4▼aPlant pathology.
■653 ▼aBreeding
■653 ▼aFine mapping
■653 ▼aStripe rust
■653 ▼aGermplasms
■653 ▼aPuccinia striiformis
■690 ▼a0473
■690 ▼a0479
■690 ▼a0480
■71020▼aUniversity of California, Davis▼bHorticulture and Agronomy.
■7730 ▼tDissertations Abstracts International▼g85-03B.
■773 ▼tDissertation Abstract International
■790 ▼a0029
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16934985▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a202402▼f2024
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