1
|
Jiang P, Fan X, Zhang G, Wu L, He Y, Li C, Zhang X. Cost-effective duplex Kompetitive Allele Specific PCR markers for homologous genes facilitating wheat breeding. BMC PLANT BIOLOGY 2023; 23:119. [PMID: 36855097 PMCID: PMC9976436 DOI: 10.1186/s12870-023-04116-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 02/10/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND Owing to successful cloning of wheat functional genes in recent years, more traits can be selected by diagnostic markers, and consequently, effective molecular markers will be powerful tools in wheat breeding programs. RESULTS The present study proposed a cost-effective duplex Kompetitive Allele Specific PCR (dKASP) marker system that combined multiplex PCR and KASP™ technology to yield twice the efficiency at half the cost compared with the common KASP™ markers and provide great assistance in breeding selection. Three dKASP markers for the major genes controlling plant height (Rht-B1/Rht-D1), grain hardness (Pina-D1/Pinb-D1), and high-molecular-weight glutenin subunits (Glu-A1/Glu-D1) were successfully developed and applied in approved wheat varieties growing in the middle and lower reaches of the Yangtze River and advanced lines from our breeding program. Three markers were used to test six loci with high efficiency. In the approved wheat varieties, Rht-B1b was the most important dwarfing allele, and the number of accessions carrying Pinb-D1b was much greater than that of the accessions carrying Pina-D1b. Moreover, the number of accessions carrying favorable alleles for weak-gluten wheat (Null/Dx2) was much greater than that of the accessions carrying favorable alleles for strong-gluten wheat (Ax1 or Ax2*/Dx5). In the advanced lines, Rht-B1b and Pinb-D1b showed a significant increase compared with the approved varieties, and the strong-gluten (Ax1 or Ax2*/Dx5) and weak-gluten (Null/Dx2) types also increased. CONCLUSION A cost-effective dKASP marker system that combined multiplex PCR and KASP™ technology was proposed to achieve double the efficiency at half the cost compared with the common KASP™ markers. Three dKASP markers for the major genes controlling PH (Rht-B1/Rht-D1), GH (Pina-D1/Pinb-D1), and HMW-GS (Glu-A1/Glu-D1) were successfully developed, which would greatly improve the efficiency of marker-assisted selection of wheat.
Collapse
Affiliation(s)
- Peng Jiang
- CIMMYT-JAAS Joint Center for Wheat Diseases, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, Jiangsu, China
| | - Xiangyun Fan
- CIMMYT-JAAS Joint Center for Wheat Diseases, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, Jiangsu, China
| | - Guangxu Zhang
- Lianyungang Institute of Agricultural Sciences, Lianyungang, 222000, Jiangsu, China
| | - Lei Wu
- CIMMYT-JAAS Joint Center for Wheat Diseases, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, Jiangsu, China
| | - Yi He
- CIMMYT-JAAS Joint Center for Wheat Diseases, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, Jiangsu, China
| | - Chang Li
- CIMMYT-JAAS Joint Center for Wheat Diseases, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, Jiangsu, China
| | - Xu Zhang
- CIMMYT-JAAS Joint Center for Wheat Diseases, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, Jiangsu, China.
- Collaborative Innovation Center for Modern Crop Production co-sponsored by Province and Ministry, Nanjing, 210095, Jiangsu, China.
| |
Collapse
|
2
|
The antimicrobial properties of the puroindolines, a review. World J Microbiol Biotechnol 2019; 35:86. [PMID: 31134452 DOI: 10.1007/s11274-019-2655-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 05/10/2019] [Indexed: 10/26/2022]
Abstract
Antimicrobial proteins, and especially antimicrobial peptides (AMPs) hold great promise in the control of animal and plant diseases with low risk of pathogen resistance. The two puroindolines, a and b, from wheat control endosperm softness of the wheat caryopsis (grain), but have also been shown to inhibit the growth and kill various bacteria and fungi, while showing little toxicity to erythrocytes. Puroindolines are small (~ 13 kDa) amphipathic proteins with a characteristic tryptophan-rich domain (TRD) that is part of an 18 or 19 amino acid residue loop subtended by a disulfide bond. This review presents a brief history of the puroindolines, their physical-chemical characteristics, their interaction with lipids and membranes, and their activity as antimicrobial proteins and AMPs. In this latter context, the use of the TRDs of puroindoline a and b in puroindoline AMP function is reviewed. The activity of puroindoline a and b and their AMPs appear to act through similar but somewhat different modes, which may involve membrane binding, membrane disruption and ion channel formation, and intra-cellular nucleic acid binding and metabolic disruption. Natural and synthetic mutants have identified key elements of the puroindolines for antimicrobial activity.
Collapse
|
3
|
Kumar A, Kapoor P, Chunduri V, Sharma S, Garg M. Potential of Aegilops sp. for Improvement of Grain Processing and Nutritional Quality in Wheat ( Triticum aestivum). FRONTIERS IN PLANT SCIENCE 2019; 10:308. [PMID: 30936886 PMCID: PMC6431632 DOI: 10.3389/fpls.2019.00308] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 02/26/2019] [Indexed: 06/09/2023]
Abstract
Wheat is one of the most important staple crops in the world and good source of calories and nutrition. Its flour and dough have unique physical properties and can be processed to make unique products like bread, cakes, biscuits, pasta, noodles etc., which is not possible from other staple crops. Due to domestication, the genetic variability of the genes coding for different economically important traits in wheat is narrow. This genetic variability can be increased by utilizing its wild relatives. Its closest relative, genus Aegilops can be an important source of new alleles. Aegilops has played a very important role in evolution of tetraploid and hexaploid wheat. It consists of 22 species with C, D, M, N, S, T and U genomes with high allelic diversity relative to wheat. Its utilization for wheat improvement for various abiotic and biotic stresses has been reported by various scientific publications. Here in, for the first time, we review the potential of Aegilops for improvement of processing and nutritional traits in wheat. Among processing quality related gluten proteins; high molecular weight glutenins (HMW GS), being easiest to study have been explored in highest number of accessions or lines i.e., 681 belonging to 13 species and selected ones like Ae. searsii, Ae. geniculata and Ae. longissima have been linked with improved bread making quality of wheat. Gliadins and low molecular weight glutenins (LMW GS) have also been extensively explored for wheat improvement and Ae. umbellulata specific LMW GS have been linked with wheat bread making quality improvement. Aegilops has been explored for seed texture diversity and proteins like puroindolins (Pin) and grain softness proteins (GSP). For nutrition quality improvement, it has been screened for essential micronutrients like Fe, Zn, phytochemicals like carotenoids and dietary fibers like arabinoxylan and β-glucan. Ae. kotschyi and Ae. biuncialis transfer in wheat have been associated with higher Fe, Zn content. In this article we have tried to compile information available on exploration of nutritional and processing quality related traits in Aegilops section and their utilization for wheat improvement by different approaches.
Collapse
|
4
|
Shaaf S, Sharma R, Baloch FS, Badaeva ED, Knüpffer H, Kilian B, Özkan H. The grain Hardness locus characterized in a diverse wheat panel (Triticum aestivum L.) adapted to the central part of the Fertile Crescent: genetic diversity, haplotype structure, and phylogeny. Mol Genet Genomics 2016; 291:1259-75. [DOI: 10.1007/s00438-016-1180-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Accepted: 02/03/2016] [Indexed: 12/27/2022]
|
5
|
Cuesta S, Guzmán C, Alvarez JB. Allelic diversity and molecular characterization of puroindoline genes in five diploid species of the Aegilops genus. JOURNAL OF EXPERIMENTAL BOTANY 2013; 64:5133-5143. [PMID: 24058161 DOI: 10.1093/jxb/ert299] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Grain hardness is an important quality trait in wheat. This trait is related to the variation in, and the presence of, puroindolines (PINA and PINB). This variation can be increased by the allelic polymorphism present in the Aegilops species that are related to wheat. This study evaluated allelic Pina and Pinb gene variability in five diploid species of the Aegilops genus, along with the molecular characterization of the main allelic variants found in each species. This polymorphism resulted in 16 alleles for the Pina gene and 24 alleles for the Pinb gene, of which 10 and 17, respectively, were novel. Diverse mutations were detected in the deduced mature proteins of these alleles, which could influence the hardness characteristics of these proteins. This study shows that the diploid species of the Aegilops genus could be a good source of genetic variability for both Pina and Pinb genes, which could be used in breeding programmes to extend the range of different textures in wheat.
Collapse
Affiliation(s)
- Susana Cuesta
- Departamento de Genética, Escuela Técnica Superior de Ingeniería Agronómica y de Montes, Edificio Gregor Mendel, Campus de Rabanales, Universidad de Córdoba, CeiA3, ES-14071 Córdoba, Spain
| | | | | |
Collapse
|
6
|
Haraszi R, Juhász A, Sissons M, Rakszegi M, Tamás L, Anderssen RS. Rheological Hardness Index for Assessing Hardness of Hexaploids and Durums. Cereal Chem 2013. [DOI: 10.1094/cchem-10-12-0133-r] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Réka Haraszi
- European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (present address), formerly CSIRO Plant Industry, Black Mountain Laboratories, Canberra ACT 2601, Australia
| | - Angela Juhász
- Agricultural Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, Brunszvik u. 2., Martonvásár 2462, Hungary
| | - Mike Sissons
- NSW Department of Primary Industries, Tamworth Agricultural Institute, 4 Marsden Park Road, Calala, NSW 2340, Australia
| | - Mariann Rakszegi
- Agricultural Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, Brunszvik u. 2., Martonvásár 2462, Hungary
| | - Laszlo Tamás
- Department of Plant Physiology and Molecular Plant Biology, Eötvös Loránd University, Pázmány P 1/C, Budapest 1117, Hungary
| | - Robert S. Anderssen
- CSIRO Mathematical and Information Sciences, North Road, ANU Campus, Acton ACT, P.O. Box 664, Canberra, ACT 2601, Australia
- Corresponding author. Phone: +61 2 6216 7260. Fax: +61 2 6216 7111. E-mail:
| |
Collapse
|
7
|
Kharrazi M, Bobojonov V. Identification and sequence analysis of grain softness protein in selected wheat, rye and triticale. GENETICS AND MOLECULAR RESEARCH 2012; 11:2578-84. [DOI: 10.4238/2012.july.19.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
8
|
Taddei F, Gazza L, Conti S, Muccilli V, Foti S, Pogna NE. Starch-bound 2S proteins and kernel texture in einkorn, Triticum monococcum ssp monococcum. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2009; 119:1205-1212. [PMID: 19655123 DOI: 10.1007/s00122-009-1121-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2009] [Accepted: 07/20/2009] [Indexed: 05/28/2023]
Abstract
The starch granule proteins from 113 einkorn wheat (Triticum monococcum ssp monococcum) accessions were analyzed by acidic, polyacrylamide gel electrophoresis (A-PAGE), and two-dimensional A-PAGE x SDS-PAGE. All accessions were confirmed to contain equal amounts of two polypeptide chains corresponding to puroindoline B (Pin-B), as well as a prominent component plus a faint band corresponding to puroindoline A (Pin-A). When compared with soft-textured common wheat, "monococcum" accessions showed an increase of 3.2- and 2.7-fold in Pin-A and Pin-B levels on the starch granules, respectively. In addition, all accessions contained a novel component of the 2S super-family of seed proteins named Einkorn Trypsin Inhibitor (ETI), which was found to be encoded as a pre-protein 148 residues long. Wild-type ETI encoded by allele Eti-A(m) 1a and "valine-type" ETI encoded by allele Eti-A(m) 1b, which occurred in 107 and six einkorn accessions, respectively, were found to accumulate on starch granules as a mature protein of 121 amino acids with a hydrophobic central domain. The einkorn accessions exhibited an average SKCS index as low as -2.05 +/- 11.4, which is typical of extra-soft kernels. The total surface area of starch granules in "monococcum" wheat, as determined by visual assessments in counting chambers, was estimated at 764 mm(2)/mg of starch, and was about 1.5 times higher than that for common wheat. The results are discussed in relation to the identification of factors that cause the extra-soft texture of einkorn kernels.
Collapse
|
9
|
Loit E, Melnyk CW, MacFarlane AJ, Scott FW, Altosaar I. Identification of three wheat globulin genes by screening a Triticum aestivum BAC genomic library with cDNA from a diabetes-associated globulin. BMC PLANT BIOLOGY 2009; 9:93. [PMID: 19615078 PMCID: PMC2729749 DOI: 10.1186/1471-2229-9-93] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2009] [Accepted: 07/17/2009] [Indexed: 05/28/2023]
Abstract
BACKGROUND Exposure to dietary wheat proteins in genetically susceptible individuals has been associated with increased risk for the development of Type 1 diabetes (T1D). Recently, a wheat protein encoded by cDNA WP5212 has been shown to be antigenic in mice, rats and humans with autoimmune T1D. To investigate the genomic origin of the identified wheat protein cDNA, a hexaploid wheat genomic library from Glenlea cultivar was screened. RESULTS Three unique wheat globulin genes, Glo-3A, Glo3-B and Glo-3C, were identified. We describe the genomic structure of these genes and their expression pattern in wheat seeds. The Glo-3A gene shared 99% identity with the cDNA of WP5212 at the nucleotide and deduced amino acid level, indicating that we have identified the gene(s) encoding wheat protein WP5212. Southern analysis revealed the presence of multiple copies of Glo-3-like sequences in all wheat samples, including hexaploid, tetraploid and diploid species wheat seed. Aleurone and embryo tissue specificity of WP5212 gene expression, suggested by promoter region analysis, which demonstrated an absence of endosperm specific cis elements, was confirmed by immunofluorescence microscopy using anti-WP5212 antibodies. CONCLUSION Taken together, the results indicate that a diverse group of globulins exists in wheat, some of which could be associated with the pathogenesis of T1D in some susceptible individuals. These data expand our knowledge of specific wheat globulins and will enable further elucidation of their role in wheat biology and human health.
Collapse
Affiliation(s)
- Evelin Loit
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Canada
| | - Charles W Melnyk
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Canada
- Department of Plant Sciences, University of Cambridge, Cambridge, UK
| | - Amanda J MacFarlane
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Canada
- Chronic Disease Program, Ottawa Hospital Research Institute, Ottawa, Canada
- Bureau of Nutritional Sciences, Food Directorate, Health Canada, Ottawa, Canada
| | - Fraser W Scott
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Canada
- Chronic Disease Program, Ottawa Hospital Research Institute, Ottawa, Canada
| | - Illimar Altosaar
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Canada
| |
Collapse
|
10
|
Rakszegi M, Wilkinson MD, Tosi P, Lovegrove A, Kovacs G, Bedo Z, Shewry PR. Puroindoline genes and proteins in tetraploid and hexaploid species of Triticum. J Cereal Sci 2009. [DOI: 10.1016/j.jcs.2008.09.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
11
|
Feiz L, Martin JM, Giroux MJ. Creation and functional analysis of new Puroindoline alleles in Triticum aestivum. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2009; 118:247-57. [PMID: 18846362 DOI: 10.1007/s00122-008-0893-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2008] [Accepted: 09/06/2008] [Indexed: 05/24/2023]
Abstract
The Hardness (Ha) locus controls grain texture and affects many end-use properties of wheat (Triticum aestivum L.). The Ha locus is functionally comprised of the Puroindoline a and b genes, Pina and Pinb, respectively. The lack of Pin allelic diversity is a major factor limiting Ha functional analyses and wheat quality improvement. In order to create new Ha alleles, a 630 member M(2) population was produced in the soft white spring cultivar Alpowa using ethylmethane sulfonate mutagenesis. The M(2) population was screened to identify new alleles of Pina and Pinb. Eighteen new Pin alleles, including eight missense alleles, were identified. F(2) populations for four of the new Pin alleles were developed after crossing each back to non-mutant Alpowa. Grain hardness was then measured on F(2:3) seeds and the impact of each allele on grain hardness was quantified. The tested mutations were responsible for between 28 and 94% of the grain hardness variation and seed weight and vigor of all mutation lines was restored among the F(2) populations. Selection of new Pin alleles following direct phenotyping or direct sequencing is a successful approach to identify new Ha alleles useful in improving wheat product quality and understanding Ha locus function.
Collapse
Affiliation(s)
- L Feiz
- Department of Plant Sciences and Plant Pathology, Montana State University, 119 Plant Bioscience Building, Bozeman, MT, 59717-3150, USA
| | | | | |
Collapse
|
12
|
|
13
|
Bhave M, Morris CF. Molecular genetics of puroindolines and related genes: allelic diversity in wheat and other grasses. PLANT MOLECULAR BIOLOGY 2008; 66:205-19. [PMID: 18049798 DOI: 10.1007/s11103-007-9263-7] [Citation(s) in RCA: 148] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2007] [Accepted: 11/07/2007] [Indexed: 05/24/2023]
Abstract
The hardness or texture of cereal grains is a primary determinant of their technological and processing quality. Among members of the Triticeae, most notably wheat, much of the variation in texture is controlled by a single locus comprised of the Puroindoline a, Puroindoline b and Grain Softness Protein-1 (Gsp-1) genes. Puroindolines confer the three major texture classes of soft and hard common wheat and the very hard durum wheat. The protein products of these genes interact with lipids and are associated with the surface of isolated starch (as a protein fraction known as 'friabilin'). During the past ten years a great diversity of alleles of both Puroindoline genes have been discovered and significant advances made in understanding the relationship between the gene presence/absence, sequence polymorphism and texture of cereal grains. Efforts have also focussed on Puroindoline and Gsp-1 genes in diploid progenitors, other Triticeae grasses and synthetic wheats in order to understand the evolution of this gene family and find potentially useful variants. The puroindoline homologues in other cereals such as rye and barley are also receiving attention. This work summarises new developments in molecular genetics of puroindolines in wheat and related Triticeae grasses, and the related genes in other cereals.
Collapse
Affiliation(s)
- Mrinal Bhave
- Environment and Biotechnology Centre, Faculty of Life and Social Sciences, Swinburne University of Technology, P.O. Box 218, Melbourne, VIC 3122, Australia.
| | | |
Collapse
|
14
|
Bhave M, Morris CF. Molecular genetics of puroindolines and related genes: regulation of expression, membrane binding properties and applications. PLANT MOLECULAR BIOLOGY 2008; 66:221-231. [PMID: 18049797 DOI: 10.1007/s11103-007-9264-6] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2007] [Accepted: 11/07/2007] [Indexed: 05/25/2023]
Abstract
Kernel texture of wheat is a primary determinant of its technological properties. Soft kernel texture phenotype results when the Puroindoline a and Puroindoline b genes are present and encode the wild-type puroindolines PINA and PINB, respectively, and various mutations in either or both gene(s) result in hard phenotypes. A wealth of information is now available that furthers our understanding regarding the spatial and temporal regulation of expression of Puroindoline genes. Through the use of model membranes and synthetic peptides we also have a clearer understanding of the significance of the cysteine backbone, the tryptophan-rich domain (TRD) and the helicoid tertiary structures of PIN proteins in relation to their membrane-active properties. Many studies suggest individual yet co-operative modes of action of the PIN proteins in determining kernel texture, and significant evidence is accumulating that the proteins have in vivo and in vitro antimicrobial activities, shedding light on the biological roles of this unique ensemble of proteins. The puroindolines are now being explored for grain kernel texture modifications as well as antimicrobial activities.
Collapse
Affiliation(s)
- Mrinal Bhave
- Environment and Biotechnology Centre, Faculty of Life and Social Sciences, Swinburne University of Technology, P.O. Box 218, Melbourne, VIC 3122, Australia.
| | | |
Collapse
|
15
|
Li W, Huang L, Gill BS. Recurrent deletions of puroindoline genes at the grain hardness locus in four independent lineages of polyploid wheat. PLANT PHYSIOLOGY 2008; 146:200-12. [PMID: 18024553 PMCID: PMC2230614 DOI: 10.1104/pp.107.108852] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Polyploidy is known to induce numerous genetic and epigenetic changes but little is known about their physiological bases. In wheat, grain texture is mainly determined by the Hardness (Ha) locus consisting of genes Puroindoline a (Pina) and b (Pinb). These genes are conserved in diploid progenitors but were deleted from the A and B genomes of tetraploid Triticum turgidum (AB). We now report the recurrent deletions of Pina-Pinb in other lineages of polyploid wheat. We analyzed the Ha haplotype structure in 90 diploid and 300 polyploid accessions of Triticum and Aegilops spp. Pin genes were conserved in all diploid species and deletion haplotypes were detected in all polyploid Triticum and most of the polyploid Aegilops spp. Two Pina-Pinb deletion haplotypes were found in hexaploid wheat (Triticum aestivum; ABD). Pina and Pinb were eliminated from the G genome, but maintained in the A genome of tetraploid Triticum timopheevii (AG). Subsequently, Pina and Pinb were deleted from the A genome but retained in the A(m) genome of hexaploid Triticum zhukovskyi (A(m)AG). Comparison of deletion breakpoints demonstrated that the Pina-Pinb deletion occurred independently and recurrently in the four polyploid wheat species. The implications of Pina-Pinb deletions for polyploid-driven evolution of gene and genome and its possible physiological significance are discussed.
Collapse
Affiliation(s)
- Wanlong Li
- Wheat Genetic and Genomic Resources Center, Department of Plant Pathology, Kansas State University, Manhattan, KS 66506-5502, USA
| | | | | |
Collapse
|