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Mao Y, Gabel A, Nakel T, Viehöver P, Baum T, Tekleyohans DG, Vo D, Grosse I, Groß-Hardt R. Selective egg cell polyspermy bypasses the triploid block. eLife 2020; 9:e52976. [PMID: 32027307 PMCID: PMC7004562 DOI: 10.7554/elife.52976] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 12/22/2019] [Indexed: 01/21/2023] Open
Abstract
Polyploidization, the increase in genome copies, is considered a major driving force for speciation. We have recently provided the first direct in planta evidence for polyspermy induced polyploidization. Capitalizing on a novel sco1-based polyspermy assay, we here show that polyspermy can selectively polyploidize the egg cell, while rendering the genome size of the ploidy-sensitive central cell unaffected. This unprecedented result indicates that polyspermy can bypass the triploid block, which is an established postzygotic polyploidization barrier. In fact, we here show that most polyspermy-derived seeds are insensitive to the triploid block suppressor admetos. The robustness of polyspermy-derived plants is evidenced by the first transcript profiling of triparental plants and our observation that these idiosyncratic organisms segregate tetraploid offspring within a single generation. Polyspermy-derived triparental plants are thus comparable to triploids recovered from interploidy crosses. Our results expand current polyploidization concepts and have important implications for plant breeding.
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Affiliation(s)
- Yanbo Mao
- Centre for Biomolecular InteractionsUniversity of BremenBremenGermany
| | - Alexander Gabel
- Institute of Computer ScienceMartin Luther University Halle-WittenbergHalleGermany
| | - Thomas Nakel
- Centre for Biomolecular InteractionsUniversity of BremenBremenGermany
| | - Prisca Viehöver
- Faculty of BiologyBielefeld UniversityBielefeldGermany
- Center for BiotechnologyBielefeld UniversityBielefeldGermany
| | - Thomas Baum
- Centre for Biomolecular InteractionsUniversity of BremenBremenGermany
| | | | - Dieu Vo
- Centre for Biomolecular InteractionsUniversity of BremenBremenGermany
| | - Ivo Grosse
- Institute of Computer ScienceMartin Luther University Halle-WittenbergHalleGermany
| | - Rita Groß-Hardt
- Centre for Biomolecular InteractionsUniversity of BremenBremenGermany
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dos Reis GB, Mesquita AT, Torres GA, Andrade-Vieira LF, Pereira AV, Davide LC. Genomic homeology between Pennisetum purpureum and Pennisetum glaucum (Poaceae). COMPARATIVE CYTOGENETICS 2014; 8:199-209. [PMID: 25349671 PMCID: PMC4205489 DOI: 10.3897/compcytogen.v8i3.7732] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Accepted: 07/14/2014] [Indexed: 05/24/2023]
Abstract
The genus Pennisetum (Richard, 1805) includes two economically important tropical forage plants: Pennisetum purpureum (Schumacher, 1827) (elephant grass), with 2n = 4x = 28 chromosomes and genomes A'A'BB, and Pennisetum glaucum (Linnaeus, 1753) (pearl millet), with 2n = 2x = 14 chromosomes and genomes AA. The genetic proximity between them allows hybrids to be obtained (2n = 3x = 21) that yield forage of higher quality in relation to the parents. The study of genomic relationships provides subsidies for the knowledge about phylogenetic relations and evolution, and is useful in breeding programs seeking gene introgression. Concerning elephant grass and pearl millet, the homeology between the genomes A and A', and between these and the genome B, has been reported by conventional cytogenetic techniques. The objective of the present study was to demonstrate the degree of homeology between these genomes by means of genomic in situ hybridization (GISH). The results confirmed the homeology between the genomes A of pearl millet and A'B of elephant grass, and showed that there are differences in the distribution and proportion of homologous regions after hybridization. Discussion regarding the evolutionary origin of P. purpureum and P. glaucum was also included.
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Affiliation(s)
| | | | - Giovana Augusta Torres
- Departament of Biology, Federal University of Lavras, Zip Code 37200-000, Lavras, MG, Brazil
| | | | - Antônio Vander Pereira
- Laboratory of Plant Genetics, Brazilian Agricultural Research Corporation, Embrapa Dairy Cattle, Zip Code 36038-330, Juiz de Fora, MG, Brazil
| | - Lisete Chamma Davide
- Departament of Biology, Federal University of Lavras, Zip Code 37200-000, Lavras, MG, Brazil
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Kaur H, Mubarik N, Kumari S, Gupta RC. Meiotic Studies in Some Species of Pennisetum Pers. (Poaceae) from the Western Himalayas. CYTOLOGIA 2014. [DOI: 10.1508/cytologia.79.247] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zhao H, Chen S, Tang F, Jiang J, Li C, Miao H, Chen F, Fang W, Guo W. Morphological characteristics and chromosome behaviour in F1, F2 and BC1 progenies between Chrysanthemum × morifolium and Ajania pacifica. RUSS J GENET+ 2012. [DOI: 10.1134/s1022795412080108] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kaushal P, Roy AK, Khare A, Malaviya DR, Zadoo SN, Choubey RN. Crossability and Characterization of Interspecific Hybrids between Sexual Pennisetum glaucum (Pearl Millet) and a New Cytotype (2n=56) of Apomictic P. squamulatum. CYTOLOGIA 2007. [DOI: 10.1508/cytologia.72.111] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Pankaj Kaushal
- Crop Improvement Division, Indian Grassland and Fodder Research Institute
| | - Ajoy Kumar Roy
- Crop Improvement Division, Indian Grassland and Fodder Research Institute
| | - Aarti Khare
- Crop Improvement Division, Indian Grassland and Fodder Research Institute
| | | | | | - Rang Nath Choubey
- Crop Improvement Division, Indian Grassland and Fodder Research Institute
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Techio VH, Davide LC, Pereira AV. Meiosis in elephant grass (Pennisetum purpureum), pearl millet (Pennisetum glaucum) (Poaceae, Poales) and their interspecific hybrids. Genet Mol Biol 2006. [DOI: 10.1590/s1415-47572006000200025] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Poulin J, Weller SG, Sakai AK. Genetic diversity does not affect the invasiveness of fountain grass (Pennisetum setaceum) in Arizona, California and Hawaii. DIVERS DISTRIB 2005. [DOI: 10.1111/j.1366-9516.2005.00136.x] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Goel S, Chen Z, Conner JA, Akiyama Y, Hanna WW, Ozias-Akins P. Delineation by fluorescence in situ hybridization of a single hemizygous chromosomal region associated with aposporous embryo sac formation in Pennisetum squamulatum and Cenchrus ciliaris. Genetics 2003; 163:1069-82. [PMID: 12663545 PMCID: PMC1462501 DOI: 10.1093/genetics/163.3.1069] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Apomixis is a means of asexual reproduction by which plants produce embryos without meiosis and fertilization; thus the embryo is of clonal, maternal origin. We previously reported molecular markers showing no recombination with the trait for aposporous embryo sac development in Pennisetum squamulatum and Cenchrus ciliaris, and the collective single-dose alleles defined an apospory-specific genomic region (ASGR). Fluorescence in situ hybridization (FISH) was used to confirm that the ASGR is a hemizygous genomic region and to determine its chromosomal position with respect to rDNA loci and centromere repeats. We also documented chromosome transmission from P. squamulatum in several backcrosses (BCs) with P. glaucum using genomic in situ hybridization (GISH). One to three complete P. squamulatum chromosomes were detected in BC(6), but only one of the three hybridized with the ASGR-linked markers. In P. squamulatum and in all BCs examined, the apospory-linked markers were located in the distal region of the short arm of a single chromosome. All alien chromosomes behaved as univalents during meiosis and segregated randomly in BC(3) and later BC generations, but presence of the ASGR-carrier chromosome alone was sufficient to confer apospory. FISH results support our hypotheses that hemizygosity, proximity to centromeric sequences, and chromosome structure may all play a role in low recombination in the ASGR.
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Affiliation(s)
- Shailendra Goel
- Department of Horticulture, University of Georgia, Tifton, Georgia 31793-0748, USA
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Affiliation(s)
- K. Vidhya
- Centre for Plant Breeding and Genetics, Agricultural College and Research Institute, Tamil Nadu Agricultural University
| | - A. K. Fazlullah Khan
- Centre for Plant Breeding and Genetics, Agricultural College and Research Institute, Tamil Nadu Agricultural University
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Techio VH, Davide LC, Pereira AV, Bearzoti E. Cytotaxonomy of some species and of interspecific hybrids of Pennisetum (Poaceae, Poales). Genet Mol Biol 2002. [DOI: 10.1590/s1415-47572002000200014] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Dujardin M, Hanna W. Microsporogenesis, reproductive behavior, and fertility in five Pennisetum species. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 1984; 67:197-201. [PMID: 24258548 DOI: 10.1007/bf00317033] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/1983] [Accepted: 07/27/1983] [Indexed: 06/02/2023]
Abstract
Microsporogenesis, reproductive behavior, pollen fertility and seed set were studied in Pennisetum basedowii Summerhayes and C. E. Hubbard, 2n = 54; P. macrostachyum (Brough.) Trin., 2n = 54; P. macrourum Trin., 2n = 36; P. polystachion (L.) Schult, 2n = 54; and P. squamulatum Fresen 2n = 54. Meiosis was regular in P. basedowii with primarily bivalent pairing. As many as 54 univalents were observed at metaphase I in P. macrostachyum. A high frequency of univalents at metaphase I in P. macrourum resulted in lagging chromosomes and micronuclei at anaphase I and telophase I, respectively. Pennisetum polystachion and P. squamulatum showed frequent multivalent chromosome associations. Studies of megasporogenesis and embryo sac development in P. basedowii showed sexual reproduction. Pennisetum macrostachyum was highly male sterile with predominantly aposporous apomictic embryo sac development. Pennisetum macrourum, P. polystachion, and P. squamulatum had only aposporous embryo sac development. Seed propagated progenies of these latter three species were uniform and matromorphic, confirming the obligate apomixis nature.
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Affiliation(s)
- M Dujardin
- Coastal Plain Station, University of Georgia, 31793, Tifton, GA, USA
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