Distribution patterns of rDNAs and telomeres and chromosomal rearrangement between two cytotypes ofLysimachia mauritianaL. (Primulaceae)

Kono, Yoshiaki; Hoshi, Yoshikazu; Setoguchi, Hiroaki; Yokota, Masatsugu; Oginuma, Kazuo

doi:10.1080/00087114.2011.10589768

Cited by 9 publications

(11 citation statements)

References 28 publications

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“…3b2). Transcriptional activity or inactivity related to the size of the 45S site, major/minor, was reported in oat and Lysimachia mauritiana L. (Winterfeld and Röser, 2007;Kono et al, 2011). In L. perenne, FISH signals in comparison to Ag-NOR banding in the same metaphase showed strong specific silver-stained signals colocated with breakage or gaps in decondensed rDNA sites.…”

Section: Discussionmentioning

confidence: 87%

“…One Table 3. Transcriptional activity or inactivity related to the size of the 45S site, major/minor, was reported in oat and Lysimachia mauritiana L. (Winterfeld and Röser, 2007;Kono et al, 2011). possible explanation is that the absence or silencing of ribosomal genes by epigenetic mechanisms was triggered by the expression of fragile sites.…”

Section: Discussionmentioning

confidence: 95%

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Distribution of rDNA in Diploid and Polyploid Lolium multiflorum Lam. and Fragile Sites in 45S rDNA Regions

et al. 2014

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The distribution, number, and location of ribosome DNA (rDNA) regions on chromosomes were evaluated, and transcriptional activity was described in genotypes of Italian ryegrass (Lolium multiflorum Lam.), as well as in an offspring resulting from interbreeding. Nucleoli and nucleolar organizer regions were labeled with silver nitrate and fluorescent in situ hybridization (FISH) was performed with 5S and 45S rDNA as probes. Hybridization procedures were performed on slides previously stained with the Ag‐NOR method. The 5S rDNA sites were highly conserved, while 45S rDNA sites had wide variability, even showing more than one site on the same chromosome. One of the genotypes had more than expected 45S rDNA sites. Approximately 95% of the cells at metaphases had at least one chromosome break/gap in the 45S rDNA site, resulting in chromosome fragmentation. Thus, 45S rDNA correspond to fragile sites in L. multiflorum. These events can affect genome organization and cause new chromosomal rearrangements which, along with some other factors, might be responsible for microevolutionary changes involved in differentiation and speciation. Not all 45S rDNA sites are transcriptionally active. Variation in both the number and size of nucleoli and mechanisms of nucleolar fusion were observed in L. multiflorum.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 95%

Distribution of rDNA in Diploid and Polyploid Lolium multiflorum Lam. and Fragile Sites in 45S rDNA Regions

et al. 2014

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“…The karyotypic formula of the 20 (4m) cytotype (2n=20= 4m+4sm+2st+10t) was clearly distinguishable from those of other 20 (4m) cytotypes detected in Japan, i.e. JM-type (2n=20= 4m+2sm+4st+10t), MR-type (2n=20= 4m+2sm+2st+12t) and HD-type (2n=20= 4m+2sm+14t) (Kono et al 2008(Kono et al , 2010(Kono et al , 2011(Kono et al , 2013(Kono et al , 2015, and was similar to that of 20 (4m) TS cytotype grown widely in southern Taiwan including two offshore islands, the Philippines, Maui in the Hawaiian Islands and Rota of the Northern Mariana Islands (Kono et al 2012). Thus, the present study is the first report to reveal that 20 (4m) TS cytotype has also grown in Japan.…”

Section: Intraspecific Karyotypic Polymorphism and Cytogeography In Tmentioning

confidence: 89%

“…The 20 (4m) cytotype distributed only in OK-1 and -36 was a cytotype specific to the area and had never been found in other places before. Its karyotypic formula (2n=20= 4m+2sm+14t) clearly differed from those of 20 (4m) JM-type (2n=20= 4m+2sm+4st+10t) and 20 (4m) MR-type (2n=20= 4m+2sm+2st+12t) previously reported (Kono et al 2011(Kono et al , 2015. Thus we designated it as 20 (4m) HD-type (Hedo cape-type).…”

Section: Intraspecific Karyotypic Polymorphism and Cytogeography In Tmentioning

confidence: 93%

Intraspecific Karyotypic Polymorphism and Cytogeography of Lysimachia mauritiana (Primulaceae) on Several Islands in the Okinawa and the Daito Groups of the Ryukyu Archipelago, Japan

et al. 2016

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Summary A coastal biennial herb, Lysimachia mauritiana, exhibited remarkable intraspecific karyotypic diversity, especially in the Ryukyu Archipelago of Japan (the Ryukyus). The species displayed five chromosome numbers (2n=16, 17, 18, 19, 20) and 18 cytotypes in the Ryukyus alone. Our serial investigations elucidated that: (1) 11 cytotypes on Takarajima Island (Is.) showed the highest intra-and inter-populational cytotype polymorphism in the Ryukyus, (2) a total of 15 cytotypes was recognized and several cytotypes coexisted in every locality on Amamioshima, Kakeromajima and Tokunoshima Is., and (3) closely located two Islands of Amamioshima and Tokunoshima had different dominant cytotypes, 16 (6m) and 18 (6m), respectively. In the present study, to explore whether a similar karyotypic polymorphism exists on their neighbor islands belonging to the Okinawa and the Daito Groups, a total of 610 plants from 51 localities on 10 islands were analyzed karyomorphologically and cytogeographically. As a result, five chromosome numbers (2n=16, 17, 18, 19, 20) and 13 cytotypes were recognized in the areas. Okinawajima Is. was divided into two areas according to cytotype distribution patterns. Northern and western areas facing the East China Sea showed intra-and inter-populational polymorphism in cytotype. By contrast, southern, eastern and northeastern areas facing the Pacific Ocean showed a single cytotype in a locality. In the Daito Group, 20 (4m) TS cytotype with a wide distribution in southern Taiwan was found in Japan for the first time. The cytotype probably descended from currents of southern Taiwan and/or the Philippines.

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“…Amamioshima Is. had neither 18 (6m) SR-type nor 20 (4m) JM-type considered to be the predominant cytotypes for chromosomal rearrangement of the species (see Kono et al 2011).…”

Section: Karyotypic Polymorphism and Cytogeographymentioning

confidence: 99%

Widespread Cytotypic Variation, Cytogeography and Dynamic Analysis of Lysimachia mauritiana (Primulaceae) on Amamioshima, Kakeromajima and Tokunoshima Islands in the Amami Group of the Ryukyu Archipelago, Japan

et al. 2015

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Summary Our continuous investigations revealed that a coastal herb, Lysimachia mauritiana, exhibited a wide-ranging intraspecific karyotypic polymorphism (18 cytotypes) in the Ryukyu Archipelago of Japan. Recently it is suggested that the small island Takarajima including 11 cytotypes showed the highest intraspecific karyotypic diversity both within and among populations in the Ryukyus. To explore karyotypic variations on its adjacent three islands, Amamioshima, Kakeromajima and Tokunoshima, karyomorphological and cytogeographical analyses were conducted in 452 individuals from 27 localities throughout the islands. A total of five different chromosome numbers (2n=16, 17, 18, 19, 20) and 15 cytotypes were recognized in the area. Except for two, two to six cytotypes coexisted in every locality. The islands showed different dominant cytotypes, i.e. 16 (6m) in Amamioshima Is., unknown in Kakeromajima Is. and 18 (6m) in Tokunoshima Is. Furthermore, it is suggested that cytotypes in northeast area in Amamioshima Is. might be converged to 16 (6m) in the near future by dynamic analyses in cytotype.

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Distribution patterns of rDNAs and telomeres and chromosomal rearrangement between two cytotypes ofLysimachia mauritianaL. (Primulaceae)

Cited by 9 publications

References 28 publications

Distribution of rDNA in Diploid and Polyploid Lolium multiflorum Lam. and Fragile Sites in 45S rDNA Regions

Distribution of rDNA in Diploid and Polyploid Lolium multiflorum Lam. and Fragile Sites in 45S rDNA Regions

Intraspecific Karyotypic Polymorphism and Cytogeography of <i>Lysimachia mauritiana</i> (Primulaceae) on Several Islands in the Okinawa and the Daito Groups of the Ryukyu Archipelago, Japan

Widespread Cytotypic Variation, Cytogeography and Dynamic Analysis of <i>Lysimachia mauritiana</i> (Primulaceae) on Amamioshima, Kakeromajima and Tokunoshima Islands in the Amami Group of the Ryukyu Archipelago, Japan

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