1
|
Fradkin M, Greizerstein EJ, Grassi E, Ferreira V, Ferrari MR, Poggio L. Cytogenetic analysis of meiotic behaviour and stability in a trigeneric hybrid (triticale x trigopiro). PROTOPLASMA 2024:10.1007/s00709-024-01964-9. [PMID: 38954027 DOI: 10.1007/s00709-024-01964-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Accepted: 06/17/2024] [Indexed: 07/04/2024]
Abstract
Trigeneric hybrids in Triticeae may help to establish evolutionary relationships among different genomes present in the same cellular genetic background and to transfer different alien characters into cultivated wheat. In the present study, a trigeneric hybrid involving species of Triticum, Secale, and Thinopyrum was synthesized by crossing hexaploid triticale with hexaploid trigopiro. The meiotic behaviour of chromosomes belonging to different genomes was analyzed, using routine and in situ hybridization techniques in F1, F2, and F3 generations of the trigeneric hybrid. The purpose of this study was to determine the chromosome number and genomic constitution and to discuss the mechanisms involved in the stabilization of the artificial tricepiro hybrids. The chromosome number of the trigeneric F1 hybrid was 2n = 42. Between 12 and 16 bivalents were observed in the central zone of the equatorial meiotic plate and between 9 and 18 univalents were found in the periphery of the MI equatorial plate. Seven of these univalents showed hybridization signals with rye DNA. Lagging rye and non-rye chromosomes and separation of sister chromatids were found in anaphase I. Tetrads with a maximum of six micronuclei, with and without hybridization signals of rye DNA, were observed. After three generations, meiotic cells revealed the presence of 42 chromosomes and 21 bivalents in diakinesis cells. The presence of 14 rye (Secale cereale) chromosomes and the complete pairing of chromosomes in F3 hybrids suggest that rye chromosomes would be preferentially transmitted to the progeny and that an elimination mechanism would act on chromosomes of Thinopyrum and wheat D genome.
Collapse
Affiliation(s)
- M Fradkin
- Cátedra de Mejoramiento Genético, Facultad de Ciencias Agrarias, Universidad Nacional de Lomas de Zamora (UNLZ), IIPAAS (Instituto de Investigación en Producción Agropecuaria, Ambiente y Salud (FCA-UNLZ-CIC), Juan XXIII y Ruta Prov. N°4, Lavallol, Lomas de Zamora, Prov. Bs As, Argentina.
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.
| | - E J Greizerstein
- Cátedra de Mejoramiento Genético, Facultad de Ciencias Agrarias, Universidad Nacional de Lomas de Zamora (UNLZ), IIPAAS (Instituto de Investigación en Producción Agropecuaria, Ambiente y Salud (FCA-UNLZ-CIC), Juan XXIII y Ruta Prov. N°4, Lavallol, Lomas de Zamora, Prov. Bs As, Argentina
| | - E Grassi
- Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Córdoba, Argentina
| | - V Ferreira
- Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Córdoba, Argentina
| | - M R Ferrari
- Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - L Poggio
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
- Laboratorio de Citogenética y Evolución, Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), CONICET, Buenos Aires, Argentina
- Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| |
Collapse
|
2
|
Boehm J, Cai X. Enrichment and Diversification of the Wheat Genome via Alien Introgression. PLANTS (BASEL, SWITZERLAND) 2024; 13:339. [PMID: 38337872 PMCID: PMC10857235 DOI: 10.3390/plants13030339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 01/08/2024] [Accepted: 01/19/2024] [Indexed: 02/12/2024]
Abstract
Wheat, including durum and common wheat, respectively, is an allopolyploid with two or three homoeologous subgenomes originating from diploid wild ancestral species. The wheat genome's polyploid origin consisting of just three diploid ancestors has constrained its genetic variation, which has bottlenecked improvement. However, wheat has a large number of relatives, including cultivated crop species (e.g., barley and rye), wild grass species, and ancestral species. Moreover, each ancestor and relative has many other related subspecies that have evolved to inhabit specific geographic areas. Cumulatively, they represent an invaluable source of genetic diversity and variation available to enrich and diversify the wheat genome. The ancestral species share one or more homologous genomes with wheat, which can be utilized in breeding efforts through typical meiotic homologous recombination. Additionally, genome introgressions of distant relatives can be moved into wheat using chromosome engineering-based approaches that feature induced meiotic homoeologous recombination. Recent advances in genomics have dramatically improved the efficacy and throughput of chromosome engineering for alien introgressions, which has served to boost the genetic potential of the wheat genome in breeding efforts. Here, we report research strategies and progress made using alien introgressions toward the enrichment and diversification of the wheat genome in the genomics era.
Collapse
Affiliation(s)
- Jeffrey Boehm
- USDA-ARS, Wheat, Sorghum & Forage Research Unit, Lincoln, NE 68583, USA;
- Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583, USA
| | - Xiwen Cai
- USDA-ARS, Wheat, Sorghum & Forage Research Unit, Lincoln, NE 68583, USA;
- Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE 68583, USA
| |
Collapse
|
3
|
Boden SA, McIntosh RA, Uauy C, Krattinger SG, Dubcovsky J, Rogers WJ, Xia XC, Badaeva ED, Bentley AR, Brown-Guedira G, Caccamo M, Cattivelli L, Chhuneja P, Cockram J, Contreras-Moreira B, Dreisigacker S, Edwards D, González FG, Guzmán C, Ikeda TM, Karsai I, Nasuda S, Pozniak C, Prins R, Sen TZ, Silva P, Simkova H, Zhang Y. Updated guidelines for gene nomenclature in wheat. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2023; 136:72. [PMID: 36952017 PMCID: PMC10036449 DOI: 10.1007/s00122-023-04253-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 10/10/2022] [Indexed: 06/18/2023]
Abstract
KEY MESSAGE Here, we provide an updated set of guidelines for naming genes in wheat that has been endorsed by the wheat research community. The last decade has seen a proliferation in genomic resources for wheat, including reference- and pan-genome assemblies with gene annotations, which provide new opportunities to detect, characterise, and describe genes that influence traits of interest. The expansion of genetic information has supported growth of the wheat research community and catalysed strong interest in the genes that control agronomically important traits, such as yield, pathogen resistance, grain quality, and abiotic stress tolerance. To accommodate these developments, we present an updated set of guidelines for gene nomenclature in wheat. These guidelines can be used to describe loci identified based on morphological or phenotypic features or to name genes based on sequence information, such as similarity to genes characterised in other species or the biochemical properties of the encoded protein. The updated guidelines provide a flexible system that is not overly prescriptive but provides structure and a common framework for naming genes in wheat, which may be extended to related cereal species. We propose these guidelines be used henceforth by the wheat research community to facilitate integration of data from independent studies and allow broader and more efficient use of text and data mining approaches, which will ultimately help further accelerate wheat research and breeding.
Collapse
Affiliation(s)
- S. A. Boden
- School of Agriculture, Food and Wine, Waite Research Institute, University of Adelaide, Glen Osmond, SA 5064 Australia
| | - R. A. McIntosh
- School of Life and Environmental Sciences, University of Sydney, Plant Breeding Institute, 107 Cobbitty Road, Cobbitty, NSW 2570 Australia
| | - C. Uauy
- John Innes Centre, Norwich Research Park, Norwich, NR4 7UH UK
| | - S. G. Krattinger
- Plant Science Program, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Saudi Arabia
- The Wheat Initiative, 14195 Berlin, Germany
| | - J. Dubcovsky
- Department of Plant Science, University of California, Davis, CA 95616 USA
- The Wheat Initiative, 14195 Berlin, Germany
| | - W. J. Rogers
- Departamento de Biología Aplicada, Facultad de Agronomía (CIISAS, CIC-BIOLAB AZUL, CONICET-INBIOTEC, CRESCA), Universidad Nacional del Centro de La Provincia de Buenos Aires, Av. República Italia 780, C.C. 47, (7300), Azul, Provincia de Buenos Aires Argentina
- The Wheat Initiative, 14195 Berlin, Germany
| | - X. C. Xia
- Institute of Crop Science, National Wheat Improvement Centre, Chinese Academy of Agricultural Sciences, 12 Zhongguancun South St, Beijing, 100081 China
| | - E. D. Badaeva
- N.I. Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow, Russia 119991
| | - A. R. Bentley
- International Maize and Wheat Improvement Center (CIMMYT), Apdo Postal 6-641, Mexico, D.F., Mexico
- The Wheat Initiative, 14195 Berlin, Germany
| | - G. Brown-Guedira
- USDA-ARS Plant Science Research, North Carolina State University, William Hall 4114A, Raleigh, NC 27695 USA
- The Wheat Initiative, 14195 Berlin, Germany
| | - M. Caccamo
- NIAB, 93 Lawrence Weaver Road, Cambridge, CB3 0LE UK
- The Wheat Initiative, 14195 Berlin, Germany
| | - L. Cattivelli
- Council for Agricultural Research and Economics (CREA), Research Centre for Genomics and Bioinformatics, Via S. Protaso, 302, 29017 Fiorenzuola d’Arda, PC Italy
- The Wheat Initiative, 14195 Berlin, Germany
| | - P. Chhuneja
- School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, 141 004 India
| | - J. Cockram
- NIAB, 93 Lawrence Weaver Road, Cambridge, CB3 0LE UK
- The Wheat Initiative, 14195 Berlin, Germany
| | | | - S. Dreisigacker
- International Maize and Wheat Improvement Center (CIMMYT), Apdo Postal 6-641, Mexico, D.F., Mexico
- The Wheat Initiative, 14195 Berlin, Germany
| | - D. Edwards
- School of Biological Sciences, University of Western Australia, Perth, 6009 Australia
- The Wheat Initiative, 14195 Berlin, Germany
| | - F. G. González
- Instituto Nacional de Tecnología Agropecuaria (INTA), EEA Pergamino, y Centro de Investigaciones y Transferencia del Noroeste de la Provincia de Buenos Aires (CITNOBA, CONICET-UNNOBA-UNSADA), Ruta 32. Km 4.5, CP 2700, Pergamino, Buenos Aires Argentina
- The Wheat Initiative, 14195 Berlin, Germany
| | - C. Guzmán
- Department of Genetics, School of Agricultural and Forest Engineering, Universidad de Córdoba, Córdoba, Spain
- The Wheat Initiative, 14195 Berlin, Germany
| | - T. M. Ikeda
- Agroecosystem and Crop Breeding Group, Western Region Agricultural Research Center, Fukuyama, Hiroshima 721-8514 Japan
- The Wheat Initiative, 14195 Berlin, Germany
| | - I. Karsai
- Centre for Agricultural Research, ELKH, 2462 Martonvasar, Hungary
- The Wheat Initiative, 14195 Berlin, Germany
| | - S. Nasuda
- Laboratory of Plant Breeding, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8224 Japan
| | - C. Pozniak
- Crop Development Centre and Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK S7N 5A8 Canada
- The Wheat Initiative, 14195 Berlin, Germany
| | - R. Prins
- CenGen Pty Ltd., Worcester, 6850 South Africa
- Department of Genetics, Stellenbosch University, Matieland, 7602 South Africa
| | - T. Z. Sen
- Crop Improvement and Genetics Research Unit, USDA-ARS, 800 Buchanan St, Albany, CA 94710 USA
- The Wheat Initiative, 14195 Berlin, Germany
| | - P. Silva
- Programa Nacional de Cultivos de Secano, Instituto Nacional de Investigación Agropecuaria (INIA), Estación Experimental La Estanzuela, 70006 Colonia, Uruguay
| | - H. Simkova
- Institute of Experimental Botany of the Czech Academy of Sciences, Šlechtitelů 31, 779 00 Olomouc, Czech Republic
| | - Y. Zhang
- State Key Laboratory of Genetic Engineering, Collaborative Innovation Center of Genetics and Development, Institute of Plant Biology, School of Life Sciences, Fudan University, Shanghai, 200438 China
| | | |
Collapse
|
4
|
Darrier B, Colas I, Rimbert H, Choulet F, Bazile J, Sortais A, Jenczewski E, Sourdille P. Location and Identification on Chromosome 3B of Bread Wheat of Genes Affecting Chiasma Number. PLANTS (BASEL, SWITZERLAND) 2022; 11:2281. [PMID: 36079661 PMCID: PMC9460588 DOI: 10.3390/plants11172281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 08/05/2022] [Accepted: 08/08/2022] [Indexed: 11/16/2022]
Abstract
Understanding meiotic crossover (CO) variation in crops like bread wheat (Triticum aestivum L.) is necessary as COs are essential to create new, original and powerful combinations of genes for traits of agronomical interest. We cytogenetically characterized a set of wheat aneuploid lines missing part or all of chromosome 3B to identify the most influential regions for chiasma formation located on this chromosome. We showed that deletion of the short arm did not change the total number of chiasmata genome-wide, whereas this latter was reduced by ~35% while deleting the long arm. Contrary to what was hypothesized in a previous study, deletion of the long arm does not disturb the initiation of the synaptonemal complex (SC) in early meiotic stages. However, progression of the SC is abnormal, and we never observed its completion when the long arm is deleted. By studying six different deletion lines (missing different parts of the long arm), we revealed that at least two genes located in both the proximal (C-3BL2-0.22) and distal (3BL7-0.63-1.00) deletion bins are involved in the control of chiasmata, each deletion reducing the number of chiasmata by ~15%. We combined sequence analyses of deletion bins with RNA-Seq data derived from meiotic tissues and identified a set of genes for which at least the homoeologous copy on chromosome 3B is expressed and which are involved in DNA processing. Among these genes, eight (CAP-E1/E2, DUO1, MLH1, MPK4, MUS81, RTEL1, SYN4, ZIP4) are known to be involved in the recombination pathway.
Collapse
Affiliation(s)
- Benoit Darrier
- UMR 1095 Genetics, Diversity and Ecophysiology of Cereals, 5, INRAE–Université Clermont-Auvergne, Chemin de Beaulieu, 63000 Clermont-Ferrand, France
- Syngenta, Toulouse Innovation Centre 12 Chemin de l’Hobit, 31790 Saint-Sauveur, France
| | - Isabelle Colas
- Cell and Molecular Sciences, The James Hutton Institute, Invergowrie, Dundee DD2 5DA, UK
| | - Hélène Rimbert
- UMR 1095 Genetics, Diversity and Ecophysiology of Cereals, 5, INRAE–Université Clermont-Auvergne, Chemin de Beaulieu, 63000 Clermont-Ferrand, France
| | - Frédéric Choulet
- UMR 1095 Genetics, Diversity and Ecophysiology of Cereals, 5, INRAE–Université Clermont-Auvergne, Chemin de Beaulieu, 63000 Clermont-Ferrand, France
| | - Jeanne Bazile
- UMR 1095 Genetics, Diversity and Ecophysiology of Cereals, 5, INRAE–Université Clermont-Auvergne, Chemin de Beaulieu, 63000 Clermont-Ferrand, France
| | - Aurélien Sortais
- UMR 1095 Genetics, Diversity and Ecophysiology of Cereals, 5, INRAE–Université Clermont-Auvergne, Chemin de Beaulieu, 63000 Clermont-Ferrand, France
| | - Eric Jenczewski
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, CNRS, Université Paris-Saclay, 78000 Versailles, France
| | - Pierre Sourdille
- UMR 1095 Genetics, Diversity and Ecophysiology of Cereals, 5, INRAE–Université Clermont-Auvergne, Chemin de Beaulieu, 63000 Clermont-Ferrand, France
| |
Collapse
|
5
|
Laugerotte J, Baumann U, Sourdille P. Genetic control of compatibility in crosses between wheat and its wild or cultivated relatives. PLANT BIOTECHNOLOGY JOURNAL 2022; 20:812-832. [PMID: 35114064 PMCID: PMC9055826 DOI: 10.1111/pbi.13784] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/26/2021] [Accepted: 01/20/2022] [Indexed: 05/16/2023]
Abstract
In the recent years, the agricultural world has been progressing towards integrated crop protection, in the context of sustainable and reasoned agriculture to improve food security and quality, and to preserve the environment through reduced uses of water, pesticides, fungicides or fertilisers. For this purpose, one possible issue is to cross-elite varieties widely used in fields for crop productions with exotic or wild genetic resources in order to introduce new diversity for genes or alleles of agronomical interest to accelerate the development of new improved cultivars. However, crossing ability (or crossability) often depends on genetic background of the recipient varieties or of the donor, which hampers a larger use of wild resources in breeding programmes of many crops. In this review, we tried to provide a comprehensive summary of genetic factors controlling crossing ability between Triticeae species with a special focus on the crossability between wheat (Triticum aestivum L.) and rye (Secale cereale), which lead to the creation of Triticale (x Triticosecale Wittm.). We also discussed potential applications of newly identified genes or markers associated with crossability for accelerating wheat and Triticale improvement by application of modern genomics technologies in breeding programmes.
Collapse
Affiliation(s)
- Julie Laugerotte
- Genetics, Diversity and Ecophysiology of CerealsINRAEUniversité Clermont‐AuvergneClermont‐FerrandFrance
| | - Ute Baumann
- School of Agriculture, Food and WineUniversity of AdelaideGlen OsmondSouth AustraliaAustralia
| | - Pierre Sourdille
- Genetics, Diversity and Ecophysiology of CerealsINRAEUniversité Clermont‐AuvergneClermont‐FerrandFrance
| |
Collapse
|
6
|
Pan C, Li Q, Han H, Zhang J, Zhou S, Yang X, Li X, Li L, Liu W. Identification of 5P Chromosomes in Wheat- Agropyron cristatum Addition Line and Analysis of Its Effect on Homologous Pairing of Wheat Chromosomes. FRONTIERS IN PLANT SCIENCE 2022; 13:844348. [PMID: 35283927 PMCID: PMC8908377 DOI: 10.3389/fpls.2022.844348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 01/27/2022] [Indexed: 06/14/2023]
Abstract
As an important wheat wild relative, the P genome of Agropyron cristatum (L.) Gaertn. (2n = 4x = 28) is very valuable for wheat improvement. A complete set of wheat-A. cristatum disomic addition lines is the basis for studying the genetic behavior of alien homoeologous chromosomes and exploring and utilizing the excellent genes. In this study, a wheat-A. cristatum derivative II-11-1 was proven to contain a pair of 5P chromosomes and a pair of 2P chromosomes with 42 wheat chromosomes by analyzing the fluorescence in situ hybridization (FISH) and expressed sequence tag (EST) markers. Additionally, cytological identification and field investigation showed that the 5P chromosome can weaken the homologous pairing of wheat chromosomes and promote the pairing between homoeologous chromosomes. This provides new materials for studying the mechanism of the alien gene affecting the homologous chromosome pairing and promoting the homoeologous pairing of wheat. In addition, chromosomal structural variants have been identified in the progeny of II-11-1. Therefore, the novel 5P addition line might be used as an important genetic material to widen the genetic resources of wheat.
Collapse
Affiliation(s)
- Cuili Pan
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
- School of Agriculture, Ningxia University, Yinchuan, China
| | - Qingfeng Li
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
- School of Agriculture, Ningxia University, Yinchuan, China
| | - Haiming Han
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jinpeng Zhang
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Shenghui Zhou
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xinming Yang
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xiuquan Li
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Lihui Li
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Weihua Liu
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing, China
| |
Collapse
|
7
|
Prieto P, Palomino C, Cifuentes Z, Cabrera A. Analysis of Chromosome Associations during Early Meiosis in Wheat Lines Carrying Chromosome Introgressions from Agropyron cristatum. PLANTS (BASEL, SWITZERLAND) 2021; 10:plants10112292. [PMID: 34834654 PMCID: PMC8625001 DOI: 10.3390/plants10112292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/18/2021] [Accepted: 10/20/2021] [Indexed: 06/13/2023]
Abstract
Crested wheatgrass (Agropyron cristatum L. Gaertn., genome P), included in the Triticeae tribe (family Poaceae), is one of the most important grasses in temperate regions. It has been valued as a donor of important agronomic traits for wheat improvement, including tolerance to cold, drought, and high salinity, as well as resistance to leaf rust, stripe rust, and powdery mildew. For successful incorporation of beneficial alleles into wheat, it is essential that recombination between wheat and A. cristatum chromosomes occurs. In this work, we analysed chromosome associations during meiosis in wheat lines carrying chromosome introgressions from A. cristatum chromosomes 5P and 6P in the presence and absence of Ph1 locus using fluorescence in situ hybridisation. The results showed that the Ph1 locus does not affect chromosome associations between A. cristatum and wheat chromosomes because there were no interspecific chromosome associations; therefore, no recombination between chromosomes from wheat and Agropyron were observed in the absence of the Ph1 locus. The 5P and 6P A. cristatum chromosomes do not have a suppressor effect on the Ph1 locus. Wheat univalents in metaphase I suggest that Agropyron chromosomes might carry genes having a role in wheat homologous chromosome associations. Putative effect of the Agropyron genes on wheat chromosome associations does not interact with the Ph1 locus.
Collapse
Affiliation(s)
- Pilar Prieto
- Plant Breeding Department, Institute for Sustainable Agriculture, Agencia Estatal Consejo Superior de Investigaciones Científicas (CSIC), Alameda del Obispo s/n, Apartado 4048, 14080 Córdoba, Spain;
| | - Carmen Palomino
- Genetics Department, ETSIAM, Campus de Rabanales, Universidad de Córdoba, CeiA3, 14071 Córdoba, Spain; (C.P.); (A.C.)
| | - Zuny Cifuentes
- Plant Breeding Department, Institute for Sustainable Agriculture, Agencia Estatal Consejo Superior de Investigaciones Científicas (CSIC), Alameda del Obispo s/n, Apartado 4048, 14080 Córdoba, Spain;
| | - Adoración Cabrera
- Genetics Department, ETSIAM, Campus de Rabanales, Universidad de Córdoba, CeiA3, 14071 Córdoba, Spain; (C.P.); (A.C.)
| |
Collapse
|
8
|
Svačina R, Sourdille P, Kopecký D, Bartoš J. Chromosome Pairing in Polyploid Grasses. FRONTIERS IN PLANT SCIENCE 2020; 11:1056. [PMID: 32733528 PMCID: PMC7363976 DOI: 10.3389/fpls.2020.01056] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 06/26/2020] [Indexed: 05/20/2023]
Abstract
Polyploids are species in which three or more sets of chromosomes coexist. Polyploidy frequently occurs in plants and plays a major role in their evolution. Based on their origin, polyploid species can be divided into two groups: autopolyploids and allopolyploids. The autopolyploids arise by multiplication of the chromosome sets from a single species, whereas allopolyploids emerge from the hybridization between distinct species followed or preceded by whole genome duplication, leading to the combination of divergent genomes. Having a polyploid constitution offers some fitness advantages, which could become evolutionarily successful. Nevertheless, polyploid species must develop mechanism(s) that control proper segregation of genetic material during meiosis, and hence, genome stability. Otherwise, the coexistence of more than two copies of the same or similar chromosome sets may lead to multivalent formation during the first meiotic division and subsequent production of aneuploid gametes. In this review, we aim to discuss the pathways leading to the formation of polyploids, the occurrence of polyploidy in the grass family (Poaceae), and mechanisms controlling chromosome associations during meiosis, with special emphasis on wheat.
Collapse
Affiliation(s)
- Radim Svačina
- Institute of Experimental Botany of the Czech Academy of Sciences, Centre of the Region Haná for Biotechnological and Agricultural Research, Olomouc, Czechia
| | - Pierre Sourdille
- INRA, Génétique, Diversité, Ecophysiologie des Céréales, Clermont-Ferrand, France
| | - David Kopecký
- Institute of Experimental Botany of the Czech Academy of Sciences, Centre of the Region Haná for Biotechnological and Agricultural Research, Olomouc, Czechia
| | - Jan Bartoš
- Institute of Experimental Botany of the Czech Academy of Sciences, Centre of the Region Haná for Biotechnological and Agricultural Research, Olomouc, Czechia
| |
Collapse
|
9
|
Zuo Y, Xiang Q, Dai S, Song Z, Bao T, Hao M, Zhang L, Liu G, Li J, Liu D, Wei Y, Zheng Y, Yan Z. Development and characterization of Triticum turgidum - Aegilops comosa and T. turgidum - Ae. markgrafii amphidiploids. Genome 2020; 63:263-273. [PMID: 32160479 DOI: 10.1139/gen-2019-0215] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Aegilops comosa and Ae. markgrafii are diploid progenitors of polyploidy species of Aegilops sharing M and C genomes, respectively. Transferring valuable genes/traits from Aegilops into wheat is an alternative strategy for wheat genetic improvement. The amphidiploids between diploid species of Aegilops and tetraploid wheat can act as bridges to overcome obstacles from direct hybridization and can be developed by the union of unreduced gametes. In this study, we developed seven Triticum turgidum - Ae. comosa and two T. turgidum - Ae. markgrafii amphidiploids. The unreduced gametes mechanisms, including first-division restitution (FDR) and single-division meiosis (SDM), were observed in triploid F1 hybrids of T. turgidum - Ae. comosa (STM) and T. turgidum - Ae. markgrafii (STC). Only FDR was observed in STC hybrids, whereas FDR or both FDR and SDM were detected in the STM hybrids. All seven pairs of M chromosomes of Ae. comosa and C chromosomes of Ae. markgrafii were distinguished by fluorescent in situ hybridization (FISH) probes pSc119.2 and pTa71 combinations with pTa-535 and (CTT)12/(ACT)7, respectively. Meanwhile, the chromosomes of tetraploid wheat and diploid Aegilops parents were distinguished by the same FISH probes. The amphidiploids possessed specific valuable traits such as multiple tillers, large seed size related traits, and stripe rust resistance that could be utilized in the genetic improvement of wheat.
Collapse
Affiliation(s)
- Yuanyuan Zuo
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Wenjiang, Chengdu 611130, Sichuan, P.R. China.,Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Chengdu 611130, Sichuan, P.R. China
| | - Qin Xiang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Wenjiang, Chengdu 611130, Sichuan, P.R. China.,Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Chengdu 611130, Sichuan, P.R. China
| | - Shoufen Dai
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Wenjiang, Chengdu 611130, Sichuan, P.R. China.,Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Chengdu 611130, Sichuan, P.R. China
| | - Zhongping Song
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Wenjiang, Chengdu 611130, Sichuan, P.R. China.,Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Chengdu 611130, Sichuan, P.R. China
| | - Tingyu Bao
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Wenjiang, Chengdu 611130, Sichuan, P.R. China.,Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Chengdu 611130, Sichuan, P.R. China
| | - Ming Hao
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Wenjiang, Chengdu 611130, Sichuan, P.R. China.,Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Chengdu 611130, Sichuan, P.R. China
| | - Lianquan Zhang
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Wenjiang, Chengdu 611130, Sichuan, P.R. China.,Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Chengdu 611130, Sichuan, P.R. China
| | - Gang Liu
- Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Chengdu 611130, Sichuan, P.R. China
| | - Jian Li
- Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Chengdu 611130, Sichuan, P.R. China
| | - Dengcai Liu
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Wenjiang, Chengdu 611130, Sichuan, P.R. China.,Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Chengdu 611130, Sichuan, P.R. China
| | - Yuming Wei
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Wenjiang, Chengdu 611130, Sichuan, P.R. China.,Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Chengdu 611130, Sichuan, P.R. China
| | - Youliang Zheng
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Wenjiang, Chengdu 611130, Sichuan, P.R. China.,Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Chengdu 611130, Sichuan, P.R. China
| | - Zehong Yan
- State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Wenjiang, Chengdu 611130, Sichuan, P.R. China.,Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Chengdu 611130, Sichuan, P.R. China
| |
Collapse
|
10
|
Chromosomal Differentiation in Genetically Isolated Populations of the Marsh-Specialist Crocidura suaveolens (Mammalia: Soricidae). Genes (Basel) 2020; 11:genes11030270. [PMID: 32131436 PMCID: PMC7140822 DOI: 10.3390/genes11030270] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 02/26/2020] [Accepted: 02/27/2020] [Indexed: 12/12/2022] Open
Abstract
The genus Crocidura represents a remarkable model for the study of chromosome evolution. This is the case of the lesser white-toothed shrew (Crocidura suaveolens), a representative of the Palearctic group. Although continuously distributed from Siberia to Central Europe, C. suaveolens is a rare, habitat-specialist species in the southwesternmost limit of its distributional range, in the Gulf of Cádiz (Iberian Peninsula). In this area, C. suaveolens is restricted to genetically isolated populations associated to the tidal marches of five rivers (Guadiana, Piedras, Odiel, Tinto and Guadalquivir). This particular distributional range provides a unique opportunity to investigate whether genetic differentiation and habitat specialization was accompanied by chromosomal variation. In this context, the main objective of this study was to determinate the chromosomal characteristics of the habitat-specialist C. suaveolens in Southwestern Iberia, as a way to understand the evolutionary history of this species in the Iberian Peninsula. A total of 41 individuals from six different populations across the Gulf of Cádiz were collected and cytogenetically characterized. We detected four different karyotypes, with diploid numbers (2n) ranging from 2n = 40 to 2n = 43. Two of them (2n = 41 and 2n = 43) were characterized by the presence of B-chromosomes. The analysis of karyotype distribution across lineages and populations revealed an association between mtDNA population divergence and chromosomal differentiation. C. suaveolens populations in the Gulf of Cádiz provide a rare example of true karyotypic polymorphism potentially associated to genetic isolation and habitat specialization in which to investigate the evolutionary significance of chromosomal variation in mammals and their contribution to phenotypic and ecological divergence.
Collapse
|
11
|
Li H, Wang L, Luo MC, Nie F, Zhou Y, McGuire PE, Distelfeld A, Dai X, Song CP, Dvorak J. Recombination between homoeologous chromosomes induced in durum wheat by the Aegilops speltoides Su1-Ph1 suppressor. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2019; 132:3265-3276. [PMID: 31529271 DOI: 10.1007/s00122-019-03423-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 09/06/2019] [Indexed: 05/21/2023]
Abstract
Su1-Ph1, which we previously introgressed into wheat from Aegilops speltoides, is a potent suppressor of Ph1 and a valuable tool for gene introgression in tetraploid wheat. We previously introgressed Su1-Ph1, a suppressor of the wheat Ph1 gene, from Aegilops speltoides into durum wheat cv Langdon (LDN). Here, we evaluated the utility of the introgressed suppressor for inducing introgression of alien germplasm into durum wheat. We built LDN plants heterozygous for Su1-Ph1 that simultaneously contained a single LDN chromosome 5B and a single Ae. searsii chromosome 5Sse, which targeted them for recombination. We genotyped 28 BC1F1 and 84 F2 progeny with the wheat 90-K Illumina single-nucleotide polymorphism assay and detected extensive recombination between the two chromosomes, which we confirmed by non-denaturing fluorescence in situ hybridization (ND-FISH). We constructed BC1F1 and F2 genetic maps that were 65.31 and 63.71 cM long, respectively. Recombination rates between the 5B and 5Sse chromosomes were double the expected rate computed from their meiotic pairing, which we attributed to selection against aneuploid gametes. Recombination rate between 5B and 5Sse was depressed compared to that between 5B chromosomes in the proximal region of the long arm. We integrated ND-FISH signals into the genetic map and constructed a physical map, which we used to map a 172,188,453-bp Ph1 region. Despite the location of the region in a low-recombination region of the 5B chromosome, we detected three crossovers in it. Our data show that Su1-Ph1 is a valuable tool for gene introgression and gene mapping based on recombination between homoeologous chromosomes in wheat.
Collapse
Affiliation(s)
- Hao Li
- Key Laboratory of Plant Stress Biology, State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, China
- Department of Plant Sciences, University of California, Davis, CA, 95616, USA
| | - Le Wang
- Department of Plant Sciences, University of California, Davis, CA, 95616, USA
| | - Ming-Cheng Luo
- Department of Plant Sciences, University of California, Davis, CA, 95616, USA
| | - Fang Nie
- Key Laboratory of Plant Stress Biology, State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, China
| | - Yun Zhou
- Key Laboratory of Plant Stress Biology, State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, China
| | - Patrick E McGuire
- Department of Plant Sciences, University of California, Davis, CA, 95616, USA
| | - Assaf Distelfeld
- School of Plant Sciences and Food Security, Tel Aviv University, Tel Aviv, Israel
| | - Xiongtao Dai
- Department of Statistics, Iowa State University, Ames, IA, 50011, USA
| | - Chun-Peng Song
- Key Laboratory of Plant Stress Biology, State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng, China
| | - Jan Dvorak
- Department of Plant Sciences, University of California, Davis, CA, 95616, USA.
| |
Collapse
|
12
|
Othmeni M, Grewal S, Hubbart-Edwards S, Yang C, Scholefield D, Ashling S, Yahyaoui A, Gustafson P, Singh PK, King IP, King J. The Use of Pentaploid Crosses for the Introgression of Amblyopyrum muticum and D-Genome Chromosome Segments Into Durum Wheat. FRONTIERS IN PLANT SCIENCE 2019; 10:1110. [PMID: 31620148 PMCID: PMC6760530 DOI: 10.3389/fpls.2019.01110] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Accepted: 08/13/2019] [Indexed: 05/25/2023]
Abstract
The wild relatives of wheat provide an important source of genetic variation for wheat improvement. Much of the work in the past aimed at transferring genetic variation from wild relatives into wheat has relied on the exploitation of the ph1b mutant, located on the long arm of chromosome 5B. This mutation allows homologous recombination to occur between chromosomes from related but different genomes, e.g. between the chromosomes of wheat and related chromosomes from a wild relative resulting in the generation of interspecific recombinant chromosomes. However, the ph1b mutant also enables recombination to occur between the homologous genomes of wheat, e.g. A/B, A/D, B/D, resulting in the generation of wheat intergenomic recombinant chromosomes. In this work we report on the presence of wheat intergenomic recombinants in the genomic background of hexaploid wheat/Amblyopyrum muticum introgression lines. The transfer of genomic rearrangements involving the D-genome through pentaploid crosses provides a strategy by which the D-genome of wheat can be introgressed into durum wheat. Hence, a pentaploid crossing strategy was used to transfer D-genome segments, introgressed with either the A- and/or the B-genome, into the tetraploid background of two durum wheat genotypes Karim and Om Rabi 5 in either the presence or absence of different Am. muticum (2n = 2x = 14, TT) introgressions. Introgressions were monitored in backcross generations to the durum wheat parents via multi-color genomic in situ hybridization (mc-GISH). Tetraploid lines carrying homozygous D-genome introgressions, as well as simultaneous homozygous D- and T-genome introgressions, were developed. Introgression lines were characterized via Kompetitive Allele-Specific PCR (KASP) markers and multi-color fluorescence in situ hybridization (FISH). Results showed that new wheat sub-genomic translocations were generated at each generation in progeny that carried any Am. muticum chromosome introgression irrespective of the linkage group that the segment was derived from. The highest frequencies of homologous recombination were observed between the A- and the D-genomes. Results indicated that the genotype Karim had a higher tolerance to genomic rearrangements and T-genome introgressions compared to Om Rabi 5. This indicates the importance of the selection of the parental genotype when attempting to transfer/develop introgressions into durum wheat from pentaploid crosses.
Collapse
Affiliation(s)
- Manel Othmeni
- Nottingham BBSRC Wheat Research Centre, Division of Plant and Cop Sciences, School of Biosciences, The University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, United Kingdom
| | - Surbhi Grewal
- Nottingham BBSRC Wheat Research Centre, Division of Plant and Cop Sciences, School of Biosciences, The University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, United Kingdom
| | - Stella Hubbart-Edwards
- Nottingham BBSRC Wheat Research Centre, Division of Plant and Cop Sciences, School of Biosciences, The University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, United Kingdom
| | - Caiyun Yang
- Nottingham BBSRC Wheat Research Centre, Division of Plant and Cop Sciences, School of Biosciences, The University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, United Kingdom
| | - Duncan Scholefield
- Nottingham BBSRC Wheat Research Centre, Division of Plant and Cop Sciences, School of Biosciences, The University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, United Kingdom
| | - Stephen Ashling
- Nottingham BBSRC Wheat Research Centre, Division of Plant and Cop Sciences, School of Biosciences, The University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, United Kingdom
| | - Amor Yahyaoui
- International Maize and Wheat Improvement Center (CIMMYT) Mexico, Mexico City, Mexico
| | - Perry Gustafson
- Division of Plant Sciences, University of Missouri, Columbia, MO, United States
| | - Pawan K. Singh
- International Maize and Wheat Improvement Center (CIMMYT) Mexico, Mexico City, Mexico
| | - Ian P. King
- Nottingham BBSRC Wheat Research Centre, Division of Plant and Cop Sciences, School of Biosciences, The University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, United Kingdom
| | - Julie King
- Nottingham BBSRC Wheat Research Centre, Division of Plant and Cop Sciences, School of Biosciences, The University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, United Kingdom
| |
Collapse
|
13
|
Fan C, Luo J, Zhang S, Liu M, Li Q, Li Y, Huang L, Chen X, Ning S, Yuan Z, Zhang L, Wang J, Zheng Y, Liu D, Hao M. Genetic mapping of a major QTL promoting homoeologous chromosome pairing in a wheat landrace. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2019; 132:2155-2166. [PMID: 31016346 DOI: 10.1007/s00122-019-03344-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 04/09/2019] [Indexed: 06/09/2023]
Abstract
Common wheat landrace Kaixian-luohanmai carries a gene(s) that promotes homoeologous chromosome pairing. A major QTL responsible for this effect was mapped to chromosome arm 3AL. Polyhaploid hybrids of a Chinese common wheat landrace Kaixian-luohanmai (KL) and related species show increased levels of chromosome pairing. Over 90% of that pairing is between homoeologous arms of wheat chromosomes, with a very strong preference for pairing between homoeologs from genomes A and D. Wheat-rye pairing was also observed at low frequency. Two mapping populations were created from the hybrids of KL with two wheat genotypes top crossed to rye. Mean chiasmata numbers per plant were used as phenotypic data. Wheat 660 K and 15 K SNP arrays, DArT markers and SSR markers were used for genotyping of the top-cross ABDR hybrids. One major QTL, named QPh.sicau-3A, for increased homoeologous pairing was detected on chromosome arm 3AL, and it was responsible for ca. 16% of the total variation. This QTL was located in the interval 696-725 Mb in the Chinese Spring reference genome. SNP markers closely linked with QPh.sicau-3A were converted to KASP markers and validated for marker-assisted selection.
Collapse
Affiliation(s)
- Chaolan Fan
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China
| | - Jiangtao Luo
- Crop Research Institute, Sichuan Academy of Agricultural Science, Chengdu, 610066, Sichuan, China
| | - Shujie Zhang
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China
| | - Meng Liu
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China
| | - Qingcheng Li
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China
| | - Yazhou Li
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China
| | - Lei Huang
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China
| | - Xuejiao Chen
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China
| | - Shunzong Ning
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China
| | - Zhongwei Yuan
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China
| | - Lianquan Zhang
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China
| | - Jirui Wang
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China
| | - Youliang Zheng
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China
| | - Dengcai Liu
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China.
- Joint International Research Laboratory of Crop Resources and Genetic Improvement, Sichuan Agricultural University, Wenjiang, 611130, Sichuan, China.
| | - Ming Hao
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu Campus, Wenjiang, 611130, Sichuan, China.
| |
Collapse
|
14
|
Kishii M. An Update of Recent Use of Aegilops Species in Wheat Breeding. FRONTIERS IN PLANT SCIENCE 2019; 10:585. [PMID: 31143197 PMCID: PMC6521781 DOI: 10.3389/fpls.2019.00585] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 04/18/2019] [Indexed: 05/16/2023]
Abstract
Aegilops species have significantly contributed to wheat breeding despite the difficulties involved in the handling of wild species, such as crossability and incompatibility. A number of biotic resistance genes have been identified and incorporated into wheat varieties from Aegilops species, and this genus is also contributing toward improvement of complex traits such as yield and abiotic tolerance for drought and heat. The D genome diploid species of Aegilops tauschii has been utilized most often in wheat breeding programs. Other Aegilops species are more difficult to utilize in the breeding because of lower meiotic recombination frequencies; generally they can be utilized only after extensive and time-consuming procedures in the form of translocation/introgression lines. After the emergence of Ug99 stem rust and wheat blast threats, Aegilops species gathered more attention as a form of new resistance sources. This article aims to update recent progress on Aegilops species, as well as to cover new topics around their use in wheat breeding.
Collapse
Affiliation(s)
- Masahiro Kishii
- Global Wheat Program, International Maize and Wheat Improvement Center (CIMMYT), Texcoco, Mexico
| |
Collapse
|
15
|
Gyawali Y, Zhang W, Chao S, Xu S, Cai X. Delimitation of wheat ph1b deletion and development of ph1b-specific DNA markers. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2019; 132:195-204. [PMID: 30343385 DOI: 10.1007/s00122-018-3207-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 10/05/2018] [Indexed: 06/08/2023]
Abstract
We detected the deletion breakpoints of wheat ph1b mutant and the actual size of the deletion. Also, we developed ph1b deletion-specific markers useful for ph1b-mediated gene introgression and genome studies. The Ph1 (pairing homoeologous) locus has been considered a major genetic system for the diploidized meiotic behavior of the allopolyploid genome in wheat. It functions as a defense system against meiotic homoeologous pairing and recombination in polyploid wheat. A large deletion of the genomic region harboring Ph1 on the long arm of chromosome 5B (5BL) led to the ph1b mutant in hexaploid wheat 'Chinese Spring,' which has been widely used to induce meiotic homoeologous recombination for gene introgression from wild grasses into wheat. However, the breakpoints and physical size of the deletion remain undetermined. In the present study, we first anchored the ph1b deletion on 5BL by the high-throughput wheat 90K SNP assay and then delimited the deletion to a genomic region of 60,014,523 bp by chromosome walking. DNA marker and sequence analyses detected the nucleotide positions of the distal and proximal breakpoints (DB and PB) of the ph1b deletion and the deletion junction as well. This will facilitate understanding of the genomic region harboring the Ph1 locus in wheat. In addition, we developed user-friendly DNA markers specific for the ph1b deletion. These new ph1b deletion-specific markers will dramatically improve the efficacy of the ph1b mutant in the meiotic homoeologous recombination-based gene introgression and genome studies in wheat and its relatives.
Collapse
Affiliation(s)
- Yadav Gyawali
- Department of Plant Sciences, North Dakota State University, Fargo, ND, 58108, USA
| | - Wei Zhang
- Department of Plant Sciences, North Dakota State University, Fargo, ND, 58108, USA
| | - Shiaoman Chao
- USDA-ARS, Red River Valley Agricultural Research Center, Fargo, ND, 58102, USA
| | - Steven Xu
- USDA-ARS, Red River Valley Agricultural Research Center, Fargo, ND, 58102, USA
| | - Xiwen Cai
- Department of Plant Sciences, North Dakota State University, Fargo, ND, 58108, USA.
| |
Collapse
|
16
|
Efremova TT, Chumanova EV, Trubacheeva NV, Pershina LA. Compensation Ability between the Chromosomes of Homoeologous Group 7 of Triticum aestivum L. and Hordeum marinum ssp. gussoneanum Hudson (2n = 28) and Analysis of the Transmission Frequency of Alien 7H1Lmar Chromosome through Gametes in the Progeny of Wheat–Barley Substitution Lines. RUSS J GENET+ 2018. [DOI: 10.1134/s1022795418090065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
17
|
King J, Grewal S, Yang CY, Hubbart Edwards S, Scholefield D, Ashling S, Harper JA, Allen AM, Edwards KJ, Burridge AJ, King IP. Introgression of Aegilops speltoides segments in Triticum aestivum and the effect of the gametocidal genes. ANNALS OF BOTANY 2018; 121:229-240. [PMID: 29216335 PMCID: PMC5808807 DOI: 10.1093/aob/mcx149] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 10/13/2017] [Indexed: 05/23/2023]
Abstract
BACKGROUND AND AIMS Bread wheat (Triticum aestivum) has been through a severe genetic bottleneck as a result of its evolution and domestication. It is therefore essential that new sources of genetic variation are generated and utilized. This study aimed to generate genome-wide introgressed segments from Aegilops speltoides. Introgressions generated from this research will be made available for phenotypic analysis. METHODS Aegilops speltoides was crossed as the male parent to T. aestivum 'Paragon'. The interspecific hybrids were then backcrossed to Paragon. Introgressions were detected and characterized using the Affymetrix Axiom Array and genomic in situ hybridization (GISH). KEY RESULTS Recombination in the gametes of the F1 hybrids was at a level where it was possible to generate a genetic linkage map of Ae. speltoides. This was used to identify 294 wheat/Ae. speltoides introgressions. Introgressions from all seven linkage groups of Ae. speltoides were found, including both large and small segments. Comparative analysis showed that overall macro-synteny is conserved between Ae. speltoides and T. aestivum, but that Ae. speltoides does not contain the 4A/5A/7B translocations present in wheat. Aegilops speltoides has been reported to carry gametocidal genes, i.e. genes that ensure their transmission through the gametes to the next generation. Transmission rates of the seven Ae. speltoides linkage groups introgressed into wheat varied. A 100 % transmission rate of linkage group 2 demonstrates the presence of the gametocidal genes on this chromosome. CONCLUSIONS A high level of recombination occurs between the chromosomes of wheat and Ae. speltoides, leading to the generation of large numbers of introgressions with the potential for exploitation in breeding programmes. Due to the gametocidal genes, all germplasm developed will always contain a segment from Ae. speltoides linkage group 2S, in addition to an introgression from any other linkage group.
Collapse
Affiliation(s)
- Julie King
- Division of Plant and Cop Sciences, University of Nottingham, Sutton Bonington Campus, Loughborough, UK
| | - Surbhi Grewal
- Division of Plant and Cop Sciences, University of Nottingham, Sutton Bonington Campus, Loughborough, UK
| | - Cai-yun Yang
- Division of Plant and Cop Sciences, University of Nottingham, Sutton Bonington Campus, Loughborough, UK
| | - Stella Hubbart Edwards
- Division of Plant and Cop Sciences, University of Nottingham, Sutton Bonington Campus, Loughborough, UK
| | - Duncan Scholefield
- Division of Plant and Cop Sciences, University of Nottingham, Sutton Bonington Campus, Loughborough, UK
| | - Stephen Ashling
- Division of Plant and Cop Sciences, University of Nottingham, Sutton Bonington Campus, Loughborough, UK
| | - John A Harper
- The Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Plas Gogerddan, UK
| | | | | | | | - Ian P King
- Division of Plant and Cop Sciences, University of Nottingham, Sutton Bonington Campus, Loughborough, UK
| |
Collapse
|
18
|
Zhang W, Zhang M, Zhu X, Cao Y, Sun Q, Ma G, Chao S, Yan C, Xu SS, Cai X. Molecular cytogenetic and genomic analyses reveal new insights into the origin of the wheat B genome. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2018; 131:365-375. [PMID: 29094182 DOI: 10.1007/s00122-017-3007-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 10/26/2017] [Indexed: 05/18/2023]
Abstract
This work pinpointed the goatgrass chromosomal segment in the wheat B genome using modern cytogenetic and genomic technologies, and provided novel insights into the origin of the wheat B genome. Wheat is a typical allopolyploid with three homoeologous subgenomes (A, B, and D). The donors of the subgenomes A and D had been identified, but not for the subgenome B. The goatgrass Aegilops speltoides (genome SS) has been controversially considered a possible candidate for the donor of the wheat B genome. However, the relationship of the Ae. speltoides S genome with the wheat B genome remains largely obscure. The present study assessed the homology of the B and S genomes using an integrative cytogenetic and genomic approach, and revealed the contribution of Ae. speltoides to the origin of the wheat B genome. We discovered noticeable homology between wheat chromosome 1B and Ae. speltoides chromosome 1S, but not between other chromosomes in the B and S genomes. An Ae. speltoides-originated segment spanning a genomic region of approximately 10.46 Mb was detected on the long arm of wheat chromosome 1B (1BL). The Ae. speltoides-originated segment on 1BL was found to co-evolve with the rest of the B genome. Evidently, Ae. speltoides had been involved in the origin of the wheat B genome, but should not be considered an exclusive donor of this genome. The wheat B genome might have a polyphyletic origin with multiple ancestors involved, including Ae. speltoides. These novel findings will facilitate genome studies in wheat and other polyploids.
Collapse
Affiliation(s)
- Wei Zhang
- Department of Plant Sciences, North Dakota State University, Fargo, ND, 58108-6050, USA
| | - Mingyi Zhang
- Department of Plant Sciences, North Dakota State University, Fargo, ND, 58108-6050, USA
| | - Xianwen Zhu
- Department of Plant Sciences, North Dakota State University, Fargo, ND, 58108-6050, USA
| | - Yaping Cao
- Department of Plant Sciences, North Dakota State University, Fargo, ND, 58108-6050, USA
| | - Qing Sun
- Department of Computer Science, North Dakota State University, Fargo, ND, 58108-6050, USA
| | - Guojia Ma
- Department of Plant Sciences, North Dakota State University, Fargo, ND, 58108-6050, USA
| | - Shiaoman Chao
- The Red River Valley Agricultural Research Center, USDA-ARS, Fargo, ND, 58102, USA
| | - Changhui Yan
- Department of Computer Science, North Dakota State University, Fargo, ND, 58108-6050, USA
| | - Steven S Xu
- The Red River Valley Agricultural Research Center, USDA-ARS, Fargo, ND, 58102, USA
| | - Xiwen Cai
- Department of Plant Sciences, North Dakota State University, Fargo, ND, 58108-6050, USA.
| |
Collapse
|
19
|
Li H, Deal KR, Luo MC, Ji W, Distelfeld A, Dvorak J. Introgression of the Aegilops speltoides Su1-Ph1 Suppressor into Wheat. FRONTIERS IN PLANT SCIENCE 2017; 8:2163. [PMID: 29326749 PMCID: PMC5742420 DOI: 10.3389/fpls.2017.02163] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2017] [Accepted: 12/07/2017] [Indexed: 05/19/2023]
Abstract
Meiotic pairing between homoeologous chromosomes in polyploid wheat is inhibited by the Ph1 locus on the long arm of chromosome 5 in the B genome. Aegilops speltoides (genomes SS), the closest relative of the progenitor of the wheat B genome, is polymorphic for genetic suppression of Ph1. Using this polymorphism, two major suppressor loci, Su1-Ph1 and Su2-Ph1, have been mapped in Ae. speltoides. Su1-Ph1 is located in the distal, high-recombination region of the long arm of the Ae. speltoides chromosome 3S. Its location and tight linkage to marker Xpsr1205-3S makes Su1-Ph1 a suitable target for introgression into wheat. Here, Xpsr1205-3S was introgressed into hexaploid bread wheat cv. Chinese Spring (CS) and from there into tetraploid durum wheat cv. Langdon (LDN). Sequential fluorescence in situ hybridization and genomic in situ hybridization showed that an Ae. speltoides segment with Xpsr1205-3S replaced the distal end of the long arm of chromosome 3A. In the CS genetic background, the chromosome induced homoeologous chromosome pairing in interspecific hybrids with Ae. peregrina but not in progenies from crosses involving alien disomic substitution lines. In the LDN genetic background, the chromosome induced homoeologous chromosome pairing in both interspecific hybrids and progenies from crosses involving alien disomic substitution lines. We conclude that the recombined chromosome harbors Su1-Ph1 but its expression requires expression of complementary gene that is present in LDN but absent in CS. We suggest that it is unlikely that Su1-Ph1 and ZIP4-1, a paralog of Ph1 located on wheat chromosomes 3A and 3B and Ae. tauschii chromosome 3D, are equivalent. The utility of Su1-Ph1 for induction of recombination between homoeologous chromosomes in wheat is illustrated.
Collapse
Affiliation(s)
- Hao Li
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Karin R. Deal
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Ming-Cheng Luo
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Wanquan Ji
- College of Agronomy, Northwest A&F University, Yangling, China
| | - Assaf Distelfeld
- School of Plant Sciences and Food Security, Tel Aviv University, Tel Aviv, Israel
| | - Jan Dvorak
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| |
Collapse
|
20
|
Jorgensen C, Luo MC, Ramasamy R, Dawson M, Gill BS, Korol AB, Distelfeld A, Dvorak J. A High-Density Genetic Map of Wild Emmer Wheat from the Karaca Dağ Region Provides New Evidence on the Structure and Evolution of Wheat Chromosomes. FRONTIERS IN PLANT SCIENCE 2017; 8:1798. [PMID: 29104581 PMCID: PMC5655018 DOI: 10.3389/fpls.2017.01798] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 10/03/2017] [Indexed: 05/05/2023]
Abstract
Wild emmer (Triticum turgidum ssp. dicoccoides) is a progenitor of all cultivated wheat grown today. It has been hypothesized that emmer was domesticated in the Karaca Dağ region in southeastern Turkey. A total of 445 recombinant inbred lines of T. turgidum ssp. durum cv. 'Langdon' x wild emmer accession PI 428082 from this region was developed and genotyped with the Illumina 90K single nucleotide polymorphism Infinium assay. A genetic map comprising 2,650 segregating markers was constructed. The order of the segregating markers and an additional 8,264 co-segregating markers in the Aegilops tauschii reference genome sequence was used to compare synteny of the tetraploid wheat with the Brachypodium distachyon, rice, and sorghum. These comparisons revealed the presence of 15 structural chromosome rearrangements, in addition to the already known 4A-5A-7B rearrangements. The most common type was an intra-chromosomal translocation in which the translocated segment was short and was translocated only a short distance along the chromosome. A large reciprocal translocation, one small non-reciprocal translocation, and three large and one small paracentric inversions were also discovered. The use of inversions for a phylogeny reconstruction in the Triticum-Aegilops alliance was illustrated. The genetic map was inconsistent with the current model of evolution of the rearranged chromosomes 4A-5A-7B. Genetic diversity in the rearranged chromosome 4A showed that the rearrangements might have been contemporary with wild emmer speciation. A selective sweep was found in the centromeric region of chromosome 4A in Karaca Dağ wild emmer but not in 4A of T. aestivum. The absence of diversity from a large portion of chromosome 4A of wild emmer, believed to be ancestral to all domesticated wheat, is puzzling.
Collapse
Affiliation(s)
- Chad Jorgensen
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Ming-Cheng Luo
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Ramesh Ramasamy
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Mathew Dawson
- Department of Statistics, University of California, Davis, Davis, CA, United States
| | - Bikram S. Gill
- Department of Plant Pathology, Kansas State University, Manhattan, KS, United States
| | | | - Assaf Distelfeld
- Institute for Cereal Crops Improvement, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Jan Dvorak
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| |
Collapse
|
21
|
Koo DH, Liu W, Friebe B, Gill BS. Homoeologous recombination in the presence of Ph1 gene in wheat. Chromosoma 2016; 126:531-540. [PMID: 27909815 DOI: 10.1007/s00412-016-0622-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 11/17/2016] [Accepted: 11/21/2016] [Indexed: 11/28/2022]
Abstract
A crossover (CO) and its cytological signature, the chiasma, are major features of eukaryotic meiosis. The formation of at least one CO/chiasma between homologous chromosome pairs is essential for accurate chromosome segregation at the first meiotic division and genetic recombination. Polyploid organisms with multiple sets of homoeologous chromosomes have evolved additional mechanisms for the regulation of CO/chiasma. In hexaploid wheat (2n = 6× = 42), this is accomplished by pairing homoeologous (Ph) genes, with Ph1 having the strongest effect on suppressing homoeologous recombination and homoeologous COs. In this study, we observed homoeologous COs between chromosome 5Mg of Aegilops geniculata and 5D of wheat in plants where Ph1 was fully active, indicating that chromosome 5Mg harbors a homoeologous recombination promoter factor(s). Further cytogenetic analysis, with different 5Mg/5D recombinants, showed that the homoeologous recombination promoting factor(s) may be located in proximal regions of 5Mg. In addition, we observed a higher frequency of homoeologous COs in the pericentromeric region between chromosome combination of rec5Mg#2S·5Mg#2L and 5D compared to 5Mg#1/5D, which may be caused by a small terminal region of 5DL homology present in chromosome rec5Mg#2. The genetic stocks reported here will be useful for analyzing the mechanism of Ph1 action and the nature of homoeologous COs.
Collapse
Affiliation(s)
- Dal-Hoe Koo
- Wheat Genetics Resource Center, Department of Plant Pathology, Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS, 66506-5502, USA
| | - Wenxuan Liu
- Wheat Genetics Resource Center, Department of Plant Pathology, Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS, 66506-5502, USA.,Laboratory of Cell and Chromosome Engineering, College of Life Sciences, Henan Agricultural University, Zhengzhou, 450002, China
| | - Bernd Friebe
- Wheat Genetics Resource Center, Department of Plant Pathology, Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS, 66506-5502, USA.
| | - Bikram S Gill
- Wheat Genetics Resource Center, Department of Plant Pathology, Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS, 66506-5502, USA
| |
Collapse
|
22
|
Liu W, Koo DH, Friebe B, Gill BS. A set of Triticum aestivum-Aegilops speltoides Robertsonian translocation lines. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2016; 129:2359-2368. [PMID: 27558595 DOI: 10.1007/s00122-016-2774-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 08/12/2016] [Indexed: 06/06/2023]
Abstract
Here we report the production of a set of wheat - Aegilops speltoides Robertsonian translocations covering all Ae. speltoides chromosome arms except the long arm of the homoeologous group 4 chromosome. Aegilops speltoides of the Poaceae family is the most probable donor of the B and G genomes of polyploid Triticum species and also an important source of resistance to diseases and pests of wheat. Previously, we reported the production of a complete set of T aestivum-Ae. speltoides chromosome addition lines and a set of disomic S(B/A)-genome chromosome substitution lines. The isolation of compensating Robertsonian translocations (RobTs) composed of alien chromosome arms translocated to homoeologous wheat chromosome arms is the important next step to exploit the genetic variation of a wild relative of wheat. Here, we report the development of molecular markers specific for the S-genome chromosomes and their use in the isolation of a set of 13 compensating wheat-Ae. speltoides RobTs covering the S genome of Ae. speltoides except for the long arm of chromosome 4S. Most of the RobTs were fully fertile and will facilitate mapping of genes to specific chromosome arms and also will accelerate the introgression of agronomically useful traits from Ae. speltoides into wheat by homologous recombination.
Collapse
Affiliation(s)
- Wenxuan Liu
- Laboratory of Cell and Chromosome Engineering, College of Life Sciences, Henan Agricultural University, Zhengzhou, Henan, 450002, People's Republic of China
| | - Dal-Hoe Koo
- Wheat Genetics Resource Center, Department of Plant Pathology, Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS, 66506-5502, USA
| | - Bernd Friebe
- Wheat Genetics Resource Center, Department of Plant Pathology, Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS, 66506-5502, USA.
| | - Bikram S Gill
- Wheat Genetics Resource Center, Department of Plant Pathology, Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS, 66506-5502, USA
| |
Collapse
|
23
|
Petersen S, Lyerly JH, Worthington ML, Parks WR, Cowger C, Marshall DS, Brown-Guedira G, Murphy JP. Mapping of powdery mildew resistance gene Pm53 introgressed from Aegilops speltoides into soft red winter wheat. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2015; 128:303-12. [PMID: 25425170 DOI: 10.1007/s00122-014-2430-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 11/14/2014] [Indexed: 05/18/2023]
Abstract
A powdery mildew resistance gene was introgressed from Aegilops speltoides into winter wheat and mapped to chromosome 5BL. Closely linked markers will permit marker-assisted selection for the resistance gene. Powdery mildew of wheat (Triticum aestivum L.) is a major fungal disease in many areas of the world, caused by Blumeria graminis f. sp. tritici (Bgt). Host plant resistance is the preferred form of disease prevention because it is both economical and environmentally sound. Identification of new resistance sources and closely linked markers enable breeders to utilize these new sources in marker-assisted selection as well as in gene pyramiding. Aegilops speltoides (2n = 2x = 14, genome SS), has been a valuable disease resistance donor. The powdery mildew resistant wheat germplasm line NC09BGTS16 (NC-S16) was developed by backcrossing an Ae. speltoides accession, TAU829, to the susceptible soft red winter wheat cultivar 'Saluda'. NC-S16 was crossed to the susceptible cultivar 'Coker 68-15' to develop F2:3 families for gene mapping. Greenhouse and field evaluations of these F2:3 families indicated that a single gene, designated Pm53, conferred resistance to powdery mildew. Bulked segregant analysis showed that multiple simple sequence repeat (SSR) and single nucleotide polymorphism (SNP) markers specific to chromosome 5BL segregated with the resistance gene. The gene was flanked by markers Xgwm499, Xwmc759, IWA6024 (0.7 cM proximal) and IWA2454 (1.8 cM distal). Pm36, derived from a different wild wheat relative (T. turgidum var. dicoccoides), had previously been mapped to chromosome 5BL in a durum wheat line. Detached leaf tests revealed that NC-S16 and a genotype carrying Pm36 differed in their responses to each of three Bgt isolates. Pm53 therefore appears to be a new source of powdery mildew resistance.
Collapse
Affiliation(s)
- Stine Petersen
- Department of Crop Science, North Carolina State University, Raleigh, NC, 27695, USA,
| | | | | | | | | | | | | | | |
Collapse
|
24
|
Abstract
Two meiotic processes have a major influence on the plant breeding, namely, the independent assortment of chromosomes, and recombination. The major chromosome pairing locus in hexaploid and tetraploid wheat, Ph1, has a significant effect on both these processes. This chapter reviews our current understanding of this locus and how mutants of it can be exploited for breeding purposes.
Collapse
Affiliation(s)
- Graham Moore
- Crop Genetics Department, John Innes Centre, Norwich Research Park, Colney, Norwich, NR4 7UH, UK,
| |
Collapse
|
25
|
Guo XH, Bi ZG, Wu BH, Wang ZZ, Hu JL, Zheng YL, Liu DC. ChAy/Bx, a novel chimeric high-molecular-weight glutenin subunit gene apparently created by homoeologous recombination in Triticum turgidum ssp. dicoccoides. Gene 2013; 531:318-25. [DOI: 10.1016/j.gene.2013.08.073] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 08/14/2013] [Accepted: 08/21/2013] [Indexed: 12/18/2022]
|
26
|
Antonyuk MZ, Shpylchyn VV, Ternovska TK. Permanent genetic variability in the introgressive lines and amphidiploids of Triticeae. CYTOL GENET+ 2013. [DOI: 10.3103/s0095452713040026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
27
|
Abstract
Meiosis is at the heart of Mendelian heredity. Recently, much progress has been made in the understanding of this process, in various organisms. In the last 15 years, the functional characterization of numerous genes involved in meiosis has dramatically deepened our knowledge of key events, including recombination, the cell cycle, and chromosome distribution. Through a constantly advancing tool set and knowledge base, a number of advances have been made that will allow manipulation of meiosis from a plant breeding perspective. This review focuses on the aspects of meiosis that can be tinkered with to create and propagate new varieties. We would like to dedicate this review to the memory of Simon W. Chan (1974-2012) (http://www.plb.ucdavis.edu/labs/srchan/).
Collapse
|
28
|
Dobrovolskaya O, Boeuf C, Salse J, Pont C, Sourdille P, Bernard M, Salina E. Microsatellite mapping of Ae. speltoides and map-based comparative analysis of the S, G, and B genomes of Triticeae species. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2011; 123:1145-1157. [PMID: 21792632 DOI: 10.1007/s00122-011-1655-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2008] [Accepted: 07/09/2011] [Indexed: 05/31/2023]
Abstract
The first microsatellite linkage map of Ae. speltoides Tausch (2n = 2x = 14, SS), which is a wild species with a genome closely related to the B and G genomes of polyploid wheats, was developed based on two F(2) mapping populations using microsatellite (SSR) markers from Ae. speltoides, wheat genomic SSRs (g-SSRs) and EST-derived SSRs. A total of 144 different microsatellite loci were mapped in the Ae. speltoides genome. The transferability of the SSRs markers between the related S, B, and G genomes allowed possible integration of new markers into the T. timopheevii G genome chromosomal maps and map-based comparisons. Thirty-one new microsatellite loci assigned to the genetic framework of the T. timopheevii G genome maps were composed of wheat g-SSR (genomic SSR) markers. Most of the used Ae. speltoides SSRs were mapped onto chromosomes of the G genome supporting a close relationship between the G and S genomes. Comparative microsatellite mapping of the S, B, and G genomes demonstrated colinearity between the chromosomes within homoeologous groups, except for intergenomic T6A(t)S.1G, T4AL.5AL.7BS translocations. A translocation between chromosomes 2 and 6 that is present in the T. aestivum B genome was found in neither Ae. speltoides nor in T. timopheevii. Although the marker order was generally conserved among the B, S, and G genomes, the total length of the Ae. speltoides chromosomal maps and the genetic distances between homoeologous loci located in the proximal regions of the S genome chromosomes were reduced compared with the B, and G genome chromosomes.
Collapse
Affiliation(s)
- O Dobrovolskaya
- Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Lavrentieva Ave. 10, Novosibirsk, 630090, Russia.
| | | | | | | | | | | | | |
Collapse
|
29
|
Tyrka M, Bednarek PT, Kilian A, Wędzony M, Hura T, Bauer E. Genetic map of triticale compiling DArT, SSR, and AFLP markers. Genome 2011; 54:391-401. [PMID: 21561288 DOI: 10.1139/g11-009] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A set of 90 doubled haploid (DH) lines derived from F(1) plants that originated from a cross between × Triticosecale Wittm. 'Saka3006' and ×Triticosecale Wittm. 'Modus', via wide crossing with maize, were used to create a genetic linkage map of triticale. The map has 21 linkage groups assigned to the A, B, and R genomes including 155 simple sequence repeat (SSR), 1385 diversity array technology (DArT), and 28 amplified fragment length polymorphism (AFLP) markers covering 2397 cM with a mean distance between two markers of 4.1 cM. Comparative analysis with wheat consensus maps revealed that triticale chromosomes of the A and B genomes were represented by 15 chromosomes, including combinations of 2AS.2AL#, 2AL#2BL, 6AS.6AL#, and 2BS.6AL# instead of 2A, 2B, and 6A. In respect to published maps of rye, substantial rearrangements were found also for chromosomes 1R, 2R, and 3R of the rye genome. Chromosomes 1R and 2R were truncated and the latter was linked with 3R. A nonhomogeneous distribution of markers across the triticale genome was observed with evident bias (48%) towards the rye genome. This genetic map may serve as a reference linkage map of triticale for efficient studies of structural rearrangements, gene mapping, and marker-assisted selection.
Collapse
Affiliation(s)
- M Tyrka
- Rzeszów University of Technology, Department of Biochemistry and Biotechnology, Powstańców Warszawy 6, 35-959 Rzeszów, Poland.
| | | | | | | | | | | |
Collapse
|
30
|
Akhunov ED, Akhunova AR, Anderson OD, Anderson JA, Blake N, Clegg MT, Coleman-Derr D, Conley EJ, Crossman CC, Deal KR, Dubcovsky J, Gill BS, Gu YQ, Hadam J, Heo H, Huo N, Lazo GR, Luo MC, Ma YQ, Matthews DE, McGuire PE, Morrell PL, Qualset CO, Renfro J, Tabanao D, Talbert LE, Tian C, Toleno DM, Warburton ML, You FM, Zhang W, Dvorak J. Nucleotide diversity maps reveal variation in diversity among wheat genomes and chromosomes. BMC Genomics 2010; 11:702. [PMID: 21156062 PMCID: PMC3022916 DOI: 10.1186/1471-2164-11-702] [Citation(s) in RCA: 138] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2010] [Accepted: 12/14/2010] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND A genome-wide assessment of nucleotide diversity in a polyploid species must minimize the inclusion of homoeologous sequences into diversity estimates and reliably allocate individual haplotypes into their respective genomes. The same requirements complicate the development and deployment of single nucleotide polymorphism (SNP) markers in polyploid species. We report here a strategy that satisfies these requirements and deploy it in the sequencing of genes in cultivated hexaploid wheat (Triticum aestivum, genomes AABBDD) and wild tetraploid wheat (Triticum turgidum ssp. dicoccoides, genomes AABB) from the putative site of wheat domestication in Turkey. Data are used to assess the distribution of diversity among and within wheat genomes and to develop a panel of SNP markers for polyploid wheat. RESULTS Nucleotide diversity was estimated in 2114 wheat genes and was similar between the A and B genomes and reduced in the D genome. Within a genome, diversity was diminished on some chromosomes. Low diversity was always accompanied by an excess of rare alleles. A total of 5,471 SNPs was discovered in 1791 wheat genes. Totals of 1,271, 1,218, and 2,203 SNPs were discovered in 488, 463, and 641 genes of wheat putative diploid ancestors, T. urartu, Aegilops speltoides, and Ae. tauschii, respectively. A public database containing genome-specific primers, SNPs, and other information was constructed. A total of 987 genes with nucleotide diversity estimated in one or more of the wheat genomes was placed on an Ae. tauschii genetic map, and the map was superimposed on wheat deletion-bin maps. The agreement between the maps was assessed. CONCLUSIONS In a young polyploid, exemplified by T. aestivum, ancestral species are the primary source of genetic diversity. Low effective recombination due to self-pollination and a genetic mechanism precluding homoeologous chromosome pairing during polyploid meiosis can lead to the loss of diversity from large chromosomal regions. The net effect of these factors in T. aestivum is large variation in diversity among genomes and chromosomes, which impacts the development of SNP markers and their practical utility. Accumulation of new mutations in older polyploid species, such as wild emmer, results in increased diversity and its more uniform distribution across the genome.
Collapse
Affiliation(s)
- Eduard D Akhunov
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
- Department of Plant Pathology, KSU, Manhattan, KS 66506, USA
| | - Alina R Akhunova
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
- Department of Plant Pathology, KSU, Manhattan, KS 66506, USA
| | - Olin D Anderson
- Genomics and Gene Discovery Unit, USDA/ARS Western Regional Research Center, Albany, CA 94710, USA
| | - James A Anderson
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108, USA
| | - Nancy Blake
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717, USA
| | - Michael T Clegg
- Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697, USA
| | - Devin Coleman-Derr
- Genomics and Gene Discovery Unit, USDA/ARS Western Regional Research Center, Albany, CA 94710, USA
| | - Emily J Conley
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108, USA
| | - Curt C Crossman
- Genomics and Gene Discovery Unit, USDA/ARS Western Regional Research Center, Albany, CA 94710, USA
| | - Karin R Deal
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Jorge Dubcovsky
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Bikram S Gill
- Department of Plant Pathology, Kansas State University, Manhattan KS 66506, USA
| | - Yong Q Gu
- Genomics and Gene Discovery Unit, USDA/ARS Western Regional Research Center, Albany, CA 94710, USA
| | - Jakub Hadam
- Department of Plant Pathology, Kansas State University, Manhattan KS 66506, USA
| | - Hwayoung Heo
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717, USA
| | - Naxin Huo
- Genomics and Gene Discovery Unit, USDA/ARS Western Regional Research Center, Albany, CA 94710, USA
| | - Gerard R Lazo
- Genomics and Gene Discovery Unit, USDA/ARS Western Regional Research Center, Albany, CA 94710, USA
| | - Ming-Cheng Luo
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Yaqin Q Ma
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
- Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA
| | | | - Patrick E McGuire
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Peter L Morrell
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108, USA
| | - Calvin O Qualset
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - James Renfro
- Genomics and Gene Discovery Unit, USDA/ARS Western Regional Research Center, Albany, CA 94710, USA
| | - Dindo Tabanao
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108, USA
- Philippine Rice Research Institute, Maligaya, Nueva Ecija, Philippines
| | - Luther E Talbert
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717, USA
| | - Chao Tian
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Donna M Toleno
- Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697, USA
| | - Marilyn L Warburton
- The International Maize and Wheat Improvement Center (CIMMYT), 06600 Mexico, D.F., Mexico
- Corn Host Plant Research Resistance Unit, USDA/ARS MSU MS 39762, USA
| | - Frank M You
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Wenjun Zhang
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Jan Dvorak
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| |
Collapse
|
31
|
Akhunov ED, Akhunova AR, Anderson OD, Anderson JA, Blake N, Clegg MT, Coleman-Derr D, Conley EJ, Crossman CC, Deal KR, Dubcovsky J, Gill BS, Gu YQ, Hadam J, Heo H, Huo N, Lazo GR, Luo MC, Ma YQ, Matthews DE, McGuire PE, Morrell PL, Qualset CO, Renfro J, Tabanao D, Talbert LE, Tian C, Toleno DM, Warburton ML, You FM, Zhang W, Dvorak J. Nucleotide diversity maps reveal variation in diversity among wheat genomes and chromosomes. BMC Genomics 2010. [PMID: 21156062 DOI: 10.1186/1471‐2164‐11‐702] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND A genome-wide assessment of nucleotide diversity in a polyploid species must minimize the inclusion of homoeologous sequences into diversity estimates and reliably allocate individual haplotypes into their respective genomes. The same requirements complicate the development and deployment of single nucleotide polymorphism (SNP) markers in polyploid species. We report here a strategy that satisfies these requirements and deploy it in the sequencing of genes in cultivated hexaploid wheat (Triticum aestivum, genomes AABBDD) and wild tetraploid wheat (Triticum turgidum ssp. dicoccoides, genomes AABB) from the putative site of wheat domestication in Turkey. Data are used to assess the distribution of diversity among and within wheat genomes and to develop a panel of SNP markers for polyploid wheat. RESULTS Nucleotide diversity was estimated in 2114 wheat genes and was similar between the A and B genomes and reduced in the D genome. Within a genome, diversity was diminished on some chromosomes. Low diversity was always accompanied by an excess of rare alleles. A total of 5,471 SNPs was discovered in 1791 wheat genes. Totals of 1,271, 1,218, and 2,203 SNPs were discovered in 488, 463, and 641 genes of wheat putative diploid ancestors, T. urartu, Aegilops speltoides, and Ae. tauschii, respectively. A public database containing genome-specific primers, SNPs, and other information was constructed. A total of 987 genes with nucleotide diversity estimated in one or more of the wheat genomes was placed on an Ae. tauschii genetic map, and the map was superimposed on wheat deletion-bin maps. The agreement between the maps was assessed. CONCLUSIONS In a young polyploid, exemplified by T. aestivum, ancestral species are the primary source of genetic diversity. Low effective recombination due to self-pollination and a genetic mechanism precluding homoeologous chromosome pairing during polyploid meiosis can lead to the loss of diversity from large chromosomal regions. The net effect of these factors in T. aestivum is large variation in diversity among genomes and chromosomes, which impacts the development of SNP markers and their practical utility. Accumulation of new mutations in older polyploid species, such as wild emmer, results in increased diversity and its more uniform distribution across the genome.
Collapse
Affiliation(s)
- Eduard D Akhunov
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Cifuentes M, Grandont L, Moore G, Chèvre AM, Jenczewski E. Genetic regulation of meiosis in polyploid species: new insights into an old question. THE NEW PHYTOLOGIST 2010; 186:29-36. [PMID: 19912546 DOI: 10.1111/j.1469-8137.2009.03084.x] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Precise chromosome segregation is vital for polyploid speciation. Here, we highlight recent findings that revitalize the old question of the genetic control of diploid-like meiosis behaviour in polyploid species. We first review new information on the genetic control of autopolyploid and allopolyploid cytological diploidization, notably in wheat and Brassica. These major advances provide new opportunities for speculating about the adaptation of meiosis during polyploid evolution. Some of these advances are discussed, and it is suggested that research on polyploidy and on meiosis should no longer be unlinked.
Collapse
Affiliation(s)
- Marta Cifuentes
- Institut Jean Pierre Bourgin, Station de Génétique et Amélioration des Plantes, 78026 Versailles Cedex, France
| | | | | | | | | |
Collapse
|
33
|
Ortiz R, Simon P, Jansky S, Stelly D. Ploidy manipulation of the gametophyte, endosperm and sporophyte in nature and for crop improvement: a tribute to Professor Stanley J. Peloquin (1921-2008). ANNALS OF BOTANY 2009; 104:795-807. [PMID: 19689972 PMCID: PMC2749530 DOI: 10.1093/aob/mcp207] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2009] [Revised: 07/13/2009] [Accepted: 07/21/2009] [Indexed: 05/27/2023]
Abstract
BACKGROUND Emeritus Campbell-Bascom Professor Stanley J. Peloquin was an internationally renowned plant geneticist and breeder who made exceptional contributions to the quantity, quality and sustainable supply of food for the world from his innovative and extensive scientific contributions. For five decades, Dr Peloquin merged basic research in plant reproduction, cytology, cytogenetics, genetics, potato (Solanum tuberosum) improvement and education at the University of Wisconsin-Madison. Successive advances across these five decades redefined scientific comprehension of reproductive variation, its genetic control, genetic effects, evolutionary impact and utility for breeding. In concert with the International Potato Center (CIP), he and others translated the advances into application, resulting in large benefits on food production worldwide, exemplifying the importance of integrated innovative university research and graduate education to meet domestic and international needs. SCOPE Dr Peloquin is known to plant breeders, geneticists, international agricultural economists and potato researchers for his enthusiastic and incisive contributions to genetic enhancement of potato using haploids, 2n gametes and wild Solanum species; for his pioneering work on potato cultivation through true seed; and as mentor of a new generation of plant breeders worldwide. The genetic enhancement of potato, the fourth most important food crop worldwide, benefited significantly from expanded germplasm utilization and advanced reproductive genetic knowledge, which he and co-workers, including many former students, systematically transformed into applied breeding methods. His research on plant sexual reproduction included subjects such as haploidization and polyploidization, self- and cross-incompatibility, cytoplasmic male sterility and restorer genes, gametophytic/sporophytic heterozygosity and male fertility, as well as endosperm dosages and seed development. By defining methods of half-tetrad analysis and new cytological techniques, he elucidated modes, mechanisms and genetic controls and effects of 2n gametes in Solanum. Ramifications extend to many other crops and plants, in both basic and applied sciences. ACHIEVEMENTS Based upon a foundation of genetics, cytogenetics and plant reproductive biology, Dr Peloquin and co-workers developed methods to use 2n gametes and haploids for breeding, and used them to move genes for important horticultural traits from wild tuber-bearing Solanum species to cultivated potato for the betterment of agriculture. The resulting potato germplasm included combinations of yield, adaptation, quality and disease resistance traits that were previously unavailable. This elite plant germplasm was utilized and distributed to 85 countries by the CIP, because it not only increased potato yields and quality, it also broadened the adaptation of potato to lowland tropical regions, where humanity has benefited from this addition to their food supply.
Collapse
Affiliation(s)
- Rodomiro Ortiz
- International Maize and Wheat Improvement Center (CIMMYT), Apdo. Postal 6-641, 06600 Mexico, D.F., Mexico.
| | | | | | | |
Collapse
|
34
|
Dwivedi S, Perotti E, Ortiz R. Towards molecular breeding of reproductive traits in cereal crops. PLANT BIOTECHNOLOGY JOURNAL 2008; 6:529-559. [PMID: 18507792 DOI: 10.1111/j.1467-7652.2008.00343.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The transition from vegetative to reproductive phase, flowering per se, floral organ development, panicle structure and morphology, meiosis, pollination and fertilization, cytoplasmic male sterility (CMS) and fertility restoration, and grain development are the main reproductive traits. Unlocking their genetic insights will enable plant breeders to manipulate these traits in cereal germplasm enhancement. Multiple genes or quantitative trait loci (QTLs) affecting flowering (phase transition, photoperiod and vernalization, flowering per se), panicle morphology and grain development have been cloned, and gene expression research has provided new information about the nature of complex genetic networks involved in the expression of these traits. Molecular biology is also facilitating the identification of diverse CMS sources in hybrid breeding. Few Rf (fertility restorer) genes have been cloned in maize, rice and sorghum. DNA markers are now used to assess the genetic purity of hybrids and their parental lines, and to pyramid Rf or tms (thermosensitive male sterility) genes in rice. Transgene(s) can be used to create de novo CMS trait in cereals. The understanding of reproductive biology facilitated by functional genomics will allow a better manipulation of genes by crop breeders and their potential use across species through genetic transformation.
Collapse
Affiliation(s)
- Sangam Dwivedi
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru 502 324, Andhra Pradesh, India.
| | | | | |
Collapse
|
35
|
Liu Z, Adamczyk K, Manzanares-Dauleux M, Eber F, Lucas MO, Delourme R, Chèvre AM, Jenczewski E. Mapping PrBn and other quantitative trait loci responsible for the control of homeologous chromosome pairing in oilseed rape (Brassica napus L.) haploids. Genetics 2006; 174:1583-96. [PMID: 16951054 PMCID: PMC1667100 DOI: 10.1534/genetics.106.064071] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In allopolyploid species, fair meiosis could be challenged by homeologous chromosome pairing and is usually achieved by the action of homeologous pairing suppressor genes. Oilseed rape (Brassica napus) haploids (AC, n=19) represent an attractive model for studying the mechanisms used by allopolyploids to ensure the diploid-like meiotic pairing pattern. In oilseed rape haploids, homeologous chromosome pairing at metaphase I was found to be genetically based and controlled by a major gene, PrBn, segregating in a background of polygenic variation. In this study, we have mapped PrBn within a 10-cM interval on the C genome linkage group DY15 and shown that PrBn displays incomplete penetrance or variable expressivity. We have identified three to six minor QTL/BTL that have slight additive effects on the amount of pairing at metaphase I but do not interact with PrBn. We have also detected a number of other loci that interact epistatically, notably with PrBn. Our results support the idea that, as in other polyploid species, metaphase I homeologous pairing in oilseed rape haploids is controlled by an integrated system of several genes, which function in a complex manner.
Collapse
Affiliation(s)
- Zhiqian Liu
- UMR INRA-Agrocampus Rennes, Amélioration des Plantes et Biotechnologies Végétales, Le Rheu, France
| | | | | | | | | | | | | | | |
Collapse
|