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Qu M, Zhang L, Li K, Sun J, Li Z, Han Y. Karyotypic stability of Fragaria (strawberry) species revealed by cross-species chromosome painting. Chromosome Res 2021; 29:285-300. [PMID: 34152515 DOI: 10.1007/s10577-021-09666-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 06/03/2021] [Accepted: 06/08/2021] [Indexed: 11/30/2022]
Abstract
Chromosome karyotyping analysis is particularly useful in determining species relationships and the origin of polyploid species. Identification of individual chromosomes is the foundation for karyotype development. For Fragaria (strawberry) species, definitive identification of the individual chromosomes is extremely difficult because of their small size and similar shape. Here, we identified all chromosomes for 11 representative Fragaria species with different ploidy using a set of oligonucleotide-based probes developed in Fragaria vesca. Comprehensive molecular cytogenetic karyotypes were established based on the individually identified chromosomes. In addition, we used oligo probes to assign the 5S and 45S rDNA loci to specific chromosomes in 16 Fragaria species. We found that these Fragaria species maintained a remarkably conserved karyotype. No inter-chromosomal structural rearrangements at the cytological level were observed in any of the chromosomes among these species. Despite karyotypic stability and similarity, variations in the signal intensity of oligo probes were observed among the homologous chromosomes in several polyploid species. Moreover, most Fragaria species also showed differences in the distribution patterns of 45S and 5S rDNA. These data provide new insights into the origins of several polyploid Fragaria species.
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Affiliation(s)
- Manman Qu
- School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Luyue Zhang
- School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Kunpeng Li
- School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Jianying Sun
- School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Zongyun Li
- School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China.
| | - Yonghua Han
- School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China.
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Kasiroek W, Indananda C, Luangoon N, Pinthong K, Supiwong W, Tanomtong A. First Chromosome Analysis of the Humpback Cardinalfish, Fibramia lateralis (Perciformes, Apogonidae). CYTOLOGIA 2017. [DOI: 10.1508/cytologia.82.9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Wannapa Kasiroek
- Department of Aquatic Science, Faculty of Science, Burapha University
- Institute of Marine Science, Burapha University
| | | | | | - Krit Pinthong
- Department of Fundamental Science, Faculty of Science and Technology, Surindra Rajabhat University
| | | | - Alongklod Tanomtong
- Toxic Substances in Livestock and Aquatic Animals Research Group, Department of Biology,
Faculty of Science, Khon Kaen University
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Ding XL, Xu TL, Wang J, Luo L, Yu C, Dong GM, Pan HT, Zhang QX. Distribution of 45S rDNA in Modern Rose Cultivars (Rosa hybrida), Rosa rugosa, and Their Interspecific Hybrids Revealed by Fluorescence in situ Hybridization. Cytogenet Genome Res 2016; 149:226-235. [PMID: 27498385 DOI: 10.1159/000448063] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/04/2016] [Indexed: 11/19/2022] Open
Abstract
To elucidate the evolutionary dynamics of the location and number of rDNA loci in the process of polyploidization in the genus Rosa, we examined 45S rDNA sites in the chromosomes of 6 modern rose cultivars (R. hybrida), 5 R. rugosa cultivars, and 20 hybrid progenies by fluorescence in situ hybridization. Variation in the number of rDNA sites in parents and their interspecific hybrids was detected. As expected, 4 rDNA sites were observed in the genomes of 4 modern rose cultivars, while 3 hybridization sites were observed in the 2 others. Two expected rDNA sites were found in 2 R. rugosa cultivars, while in the other 3 R. rugosa cultivars 4 sites were present. Among the 20 R. hybrida × R. rugosa offspring, 13 carried the expected number of rDNA sites, and 1 had 6 hybridization sites, which exceeded the expected number by far. The other 6 offspring had either 2 or 3 hybridization sites, which was less than expected. Differences in the number of rDNA loci were observed in interspecific offspring, indicating that rDNA loci exhibit instability after distant hybridization events. Abnormal chromosome pairing may be the main factor explaining the variation in rDNA sites during polyploidization.
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Affiliation(s)
- Xiao-Liu Ding
- Beijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding, National Engineering Research Center for Floriculture, Beijing Laboratory of Urban and Rural Ecological Environment and College of Landscape Architecture, Beijing Forestry University, Beijing, PR China
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Li KP, Wu YX, Zhao H, Wang Y, Lü XM, Wang JM, Xu Y, Li ZY, Han YH. Cytogenetic relationships among Citrullus species in comparison with some genera of the tribe Benincaseae (Cucurbitaceae) as inferred from rDNA distribution patterns. BMC Evol Biol 2016; 16:85. [PMID: 27090090 PMCID: PMC4835933 DOI: 10.1186/s12862-016-0656-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Accepted: 04/12/2016] [Indexed: 12/27/2022] Open
Abstract
Background Comparative mapping of 5S and 45S rDNA by fluorescent in situ hybridization (FISH) technique is an excellent tool to determine cytogenetic relationships among closely related species. Results In this study, the number and position of 5S and 45S rDNA loci in all Citrullus species and subspecies were determined. The cultivated watermelon (C. lanatus subsp. vulgaris), C. lanatus subsp. mucosospermus, C. colocynthis and C. naudinianus (or Acanthosicyos naudinianus) had two 45S rDNA loci and one 5S rDNA locus which was located syntenic to one of the 45S rDNA loci. C. ecirrhosus and C. lanatus subsp. lanatus had one 45S rDNA locus and two 5S rDNA loci, each located on a different chromosome. C. rehmii had one 5S and one 45S rDNA locus positioned on different chromosomes. The distribution of 5S and 45S rDNA in several species belonging to other genera in Benincaseae tribe was also investigated. The distribution pattern of rDNAs showed a great difference among these species. Conclusions The present study confirmed evolutionary closeness among cultivated watermelon (C. lanatus subsp. vulgaris), C. lanatus subsp. mucosospermus and C. colocynthis. Our result also supported that C. lanatus subsp. lanatus was not a wild form of the cultivated watermelon instead was a separate crop species. In addition, present cytogenetic analysis suggested that A. naudinianus was more closely related to Cucumis than to Citrullus or Acanthosicyos, but with a unique position and may be a link bridge between the Citrullus and the Cucumis.
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Affiliation(s)
- Kun-Peng Li
- Institute of Integrative Plant Biology, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Yun-Xiang Wu
- Institute of Integrative Plant Biology, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Hong Zhao
- National Engineering Research Center for Vegetables, Beijing Academy of Agriculture and Forestry Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Beijing, 100097, China
| | - Yan Wang
- Institute of Integrative Plant Biology, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Xing-Ming Lü
- Institute of Integrative Plant Biology, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China
| | - Ji-Ming Wang
- Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou, 450009, China
| | - Yong Xu
- National Engineering Research Center for Vegetables, Beijing Academy of Agriculture and Forestry Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Beijing, 100097, China
| | - Zong-Yun Li
- Institute of Integrative Plant Biology, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China.
| | - Yong-Hua Han
- Institute of Integrative Plant Biology, School of Life Sciences, Jiangsu Normal University, Xuzhou, 221116, China.
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Chacón J, Sousa A, Baeza CM, Renner SS. Ribosomal DNA distribution and a genus-wide phylogeny reveal patterns of chromosomal evolution in Alstroemeria (Alstroemeriaceae). AMERICAN JOURNAL OF BOTANY 2012; 99:1501-12. [PMID: 22956470 DOI: 10.3732/ajb.1200104] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
PREMISE OF THE STUDY Understanding the flexibility of monocot genomes requires a phylogenetic framework, which so far is available for few of the ca. 2800 genera. Here we use a molecular tree for the South American genus Alstroemeria to place karyological information, including fluorescent in situ hybridization (FISH) signals, in an explicit evolutionary context. METHODS From a phylogeny based on plastid, nuclear, and mitochondrial sequences for most species of Alstroemeria, we selected early-branching (Chilean) and derived (Brazilian) species for which we obtained 18S-25S and 5S rDNA FISH signals; we also analyzed chromosome numbers, 1C-values, and telomere FISH signals (in two species). KEY RESULTS Chromosome counts for Alstroemeria cf. rupestris and A. pulchella confirm 2n = 16 as typical of the genus, which now has chromosomes counted for 29 of its 78 species. The rDNA sites are polymorphic both among and within species, and interstitial telomeric sites in Alstroemeria cf. rupestris suggest chromosome fusion. CONCLUSIONS In spite of a constant chromosome number, closely related species of Alstroemeria differ drastically in their rDNA, indicating rapid increase, decrease, or translocations of these genes. Previously proposed Brazilian and Chilean karyotype groups are not natural, and the n = 8 chromosomes in Alstroemeria compared to n = 9 in its sister genus Bomarea may result from a Robertsonian fusion.
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Affiliation(s)
- Juliana Chacón
- Systematic Botany and Mycology, University of Munich, 80638 Munich, Germany.
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Koo DH, Nam YW, Choi D, Bang JW, de Jong H, Hur Y. Molecular cytogenetic mapping of Cucumis sativus and C. melo using highly repetitive DNA sequences. Chromosome Res 2010; 18:325-36. [PMID: 20198418 DOI: 10.1007/s10577-010-9116-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2009] [Accepted: 01/28/2010] [Indexed: 01/19/2023]
Abstract
Chromosomes often serve as one of the most important molecular aspects of studying the evolution of species. Indeed, most of the crucial mutations that led to differentiation of species during the evolution have occurred at the chromosomal level. Furthermore, the analysis of pachytene chromosomes appears to be an invaluable tool for the study of evolution due to its effectiveness in chromosome identification and precise physical gene mapping. By applying fluorescence in situ hybridization of 45S rDNA and CsCent1 probes to cucumber pachytene chromosomes, here, we demonstrate that cucumber chromosomes 1 and 2 may have evolved from fusions of ancestral karyotype with chromosome number n = 12. This conclusion is further supported by the centromeric sequence similarity between cucumber and melon, which suggests that these sequences evolved from a common ancestor. It may be after or during speciation that these sequences were specifically amplified, after which they diverged and specific sequence variants were homogenized. Additionally, a structural change on the centromeric region of cucumber chromosome 4 was revealed by fiber-FISH using the mitochondrial-related repetitive sequences, BAC-E38 and CsCent1. These showed the former sequences being integrated into the latter in multiple regions. The data presented here are useful resources for comparative genomics and cytogenetics of Cucumis and, in particular, the ongoing genome sequencing project of cucumber.
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Affiliation(s)
- Dal-Hoe Koo
- School of Bioscience and Biotechnology, Chungnam National University, Daejeon, 305-764, South Korea.
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de Araújo WC, Martínez PA, Molina WF. Mapping of Ribosomal DNA by FISH, EcoRI Digestion and Replication Bands in the Cardinalfish Apogon americanus (Perciformes). CYTOLOGIA 2010. [DOI: 10.1508/cytologia.75.109] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Washington Candeia de Araújo
- Departamento de Biologia Celular e Genética, Universidade Federal do Rio Grande do Norte, Laboratório de Genética de Recursos Marinhos, Campus Universitário
| | - Pablo Ariel Martínez
- Departamento de Biologia Celular e Genética, Universidade Federal do Rio Grande do Norte, Laboratório de Genética de Recursos Marinhos, Campus Universitário
| | - Wagner Franco Molina
- Departamento de Biologia Celular e Genética, Universidade Federal do Rio Grande do Norte, Laboratório de Genética de Recursos Marinhos, Campus Universitário
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Cabrero J, Camacho JPM. Location and expression of ribosomal RNA genes in grasshoppers: abundance of silent and cryptic loci. Chromosome Res 2008; 16:595-607. [PMID: 18431681 DOI: 10.1007/s10577-008-1214-x] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2008] [Revised: 02/02/2008] [Accepted: 02/02/2008] [Indexed: 12/01/2022]
Abstract
We investigate regularities and restrictions in chromosome location of ribosomal RNA genes, analysed by fluorescent in situ hybridization (FISH), and their phenotypic expression assessed by nucleolus formation at first meiotic prophase cells, analysed by silver impregnation, in 49 grasshopper species. High variation was found for rDNA location between species within most genera analysed. The mean haploid number of rDNA loci detected by FISH was 2.47, but some species had up to 10 loci. Chromosome distribution of rDNA loci differed between the Gomphocerinae and Oedipodinae subfamilies, most loci being proximal to the centromere in the former and distal to it in the latter. Chromosomes 2, 3 and X frequently carried rDNA in Gomphocerinae species with 2n male symbol=17 chromosomes, whereas chromosomes 6 and 9 were the most frequent rDNA locations in the Oedipodinae. About 13% of the 126 rDNA loci detected by FISH were silent, although this figure might be even higher. The comparison of FISH and silver-impregnation results also suggested the existence of cryptic NORs, i.e. those forming small nucleoli with no apparent presence of rDNA revealed by FISH. This was especially clear after the same cells in two species were sequentially treated with both silver impregnation and FISH. The abundance of silent and cryptic loci might thus suggest that rDNA spreads through grasshopper genomes by the Dubcovsky and Dvorak mechanism-that is, the transposition of a few rRNA genes to new chromosome locations, their amplification giving rise to new NORs, and the elimination of the old NORs. The cryptic NORs might correspond to nascent NORs, i.e. a few rRNA gene copies moved to new locations, whereas the inactive rDNA loci might correspond to those being in the process of elimination.
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Affiliation(s)
- Josefa Cabrero
- Departamento de Genética, Facultad de Ciencias, Universidad de Granada, 18071, Granada, Spain.
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Gernand D, Golczyk H, Rutten T, Ilnicki T, Houben A, Joachimiak AJ. Tissue culture triggers chromosome alterations, amplification, and transposition of repeat sequences in Allium fistulosum. Genome 2007; 50:435-42. [PMID: 17612612 DOI: 10.1139/g07-023] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Structural alterations in nuclei and chromosomes of cells derived from callus culture of Allium fistulosum have been studied with fluorescent in situ hybridization (FISH) using 5S ribosomal DNA (rDNA), 45S rDNA, and 375-bp repeat probes. A high frequency of chromosome abnormalities was found to be caused by the loss of telomere-located 375-bp repeats, chromosome fusion, and subsequent breakage-fusion-bridge cycles. Products of chromosome fusions and monocentric and regularly shaped chromosomes showed additional 375-bp repeat and 45S rDNA clusters at unusual sites, suggesting dynamic copy-number changes and transposition of these repeats. Southern hybridization revealed no differences in the 375-bp repeat and 45S rDNA repeat array order or the degree of methylation between DNA isolated from leaves or tissue-culture cells. In addition, protruding, spike-like structures positive for 375-bp repeats were identified on the surface of different-sized nuclei. Transmission electron microscopy analysis revealed the accumulation of densely packed chromatin within spike-like structures. Because root calyptra cells showed similar structures, it is likely that heterochromatic spike-like structures are a feature of nondividing cells at the onset of programmed cell death.
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Affiliation(s)
- Dorota Gernand
- Leibniz-Institute of Plant Genetics and Crop Plant Research (IPK), 06466 Gatersleben, Germany
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