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Fragile Sites of ‘Valencia’ Sweet Orange (Citrus sinensis) Chromosomes Are Related with Active 45s rDNA

Identifieur interne : 000176 ( Pmc/Checkpoint ); précédent : 000175; suivant : 000177

Fragile Sites of ‘Valencia’ Sweet Orange (Citrus sinensis) Chromosomes Are Related with Active 45s rDNA

Auteurs : Hong Lan [République populaire de Chine] ; Chun-Li Chen [République populaire de Chine] ; Yin Miao [République populaire de Chine] ; Chang-Xiu Yu [République populaire de Chine] ; Wen-Wu Guo [République populaire de Chine] ; Qiang Xu [République populaire de Chine] ; Xiu-Xin Deng [République populaire de Chine]

Source :

RBID : PMC:4792391

Abstract

Citrus sinensis chromosomes present a morphological differentiation of bands after staining by the fluorochromes CMA and DAPI, but there is still little information on its chromosomal characteristics. In this study, the chromosomes in ‘Valencia’ C. sinensis were analyzed by fluorescence in situ hybridization (FISH) using telomere DNA and the 45S rDNA gene as probes combining CMA/DAPI staining, which showed that there were two fragile sites in sweet orange chromosomes co-localizing at distended 45S rDNA regions, one proximally locating on B-type chromosome and the other subterminally locating on D-type chromosome. While the chromosomal CMA banding and 45S rDNA FISH mapping in the doubled haploid line of ‘Valencia’ C. sinensis indicated six 45S rDNA regions, four were identified as fragile sites as doubled comparing its parental line, which confirmed the cytological heterozygosity and chromosomal heteromorphisms in sweet orange. Furthermore, Ag-NOR identified two distended 45S rDNA regions to be active nucleolar organizing regions (NORs) in diploid ‘Valencia’ C. sinensis. The occurrence of quadrivalent in meiosis of pollen mother cells (PMCs) in ‘Valencia’ sweet orange further confirmed it was a chromosomal reciprocal translocation line. We speculated this chromosome translocation was probably related to fragile sites. Our data provide insights into the chromosomal characteristics of the fragile sites in ‘Valencia’ sweet orange and are expected to facilitate the further investigation of the possible functions of fragile sites.


Url:
DOI: 10.1371/journal.pone.0151512
PubMed: 26977938
PubMed Central: 4792391


Affiliations:


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PMC:4792391

Le document en format XML

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<title xml:lang="en" level="a" type="main">Fragile Sites of ‘Valencia’ Sweet Orange (
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<p>
<italic>Citrus sinensis</italic>
chromosomes present a morphological differentiation of bands after staining by the fluorochromes CMA and DAPI, but there is still little information on its chromosomal characteristics. In this study, the chromosomes in ‘Valencia’
<italic>C</italic>
.
<italic>sinensis</italic>
were analyzed by fluorescence
<italic>in situ</italic>
hybridization (FISH) using telomere DNA and the 45S rDNA gene as probes combining CMA/DAPI staining, which showed that there were two fragile sites in sweet orange chromosomes co-localizing at distended 45S rDNA regions, one proximally locating on B-type chromosome and the other subterminally locating on D-type chromosome. While the chromosomal CMA banding and 45S rDNA FISH mapping in the doubled haploid line of ‘Valencia’
<italic>C</italic>
.
<italic>sinensis</italic>
indicated six 45S rDNA regions, four were identified as fragile sites as doubled comparing its parental line, which confirmed the cytological heterozygosity and chromosomal heteromorphisms in sweet orange. Furthermore, Ag-NOR identified two distended 45S rDNA regions to be active nucleolar organizing regions (NORs) in diploid ‘Valencia’
<italic>C</italic>
.
<italic>sinensis</italic>
. The occurrence of quadrivalent in meiosis of pollen mother cells (PMCs) in ‘Valencia’ sweet orange further confirmed it was a chromosomal reciprocal translocation line. We speculated this chromosome translocation was probably related to fragile sites. Our data provide insights into the chromosomal characteristics of the fragile sites in ‘Valencia’ sweet orange and are expected to facilitate the further investigation of the possible functions of fragile sites.</p>
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<article-id pub-id-type="pmc">4792391</article-id>
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<subject>Fluorescent in Situ Hybridization</subject>
</subj-group>
</subj-group>
</subj-group>
</subj-group>
</subj-group>
<subj-group subj-group-type="Discipline-v3">
<subject>Biology and Life Sciences</subject>
<subj-group>
<subject>Genetics</subject>
<subj-group>
<subject>Cytogenetics</subject>
<subj-group>
<subject>Karyotypes</subject>
</subj-group>
</subj-group>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Fragile Sites of ‘Valencia’ Sweet Orange (
<italic>Citrus sinensis</italic>
) Chromosomes Are Related with Active 45s rDNA</article-title>
<alt-title alt-title-type="running-head">Chromosomal Characteristic with Fragile Sites in ‘Valencia’ Sweet Orange (
<italic>Citrus sinensis</italic>
)</alt-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Lan</surname>
<given-names>Hong</given-names>
</name>
<xref ref-type="aff" rid="aff001">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Chen</surname>
<given-names>Chun-Li</given-names>
</name>
<xref ref-type="aff" rid="aff002">
<sup>2</sup>
</xref>
<xref ref-type="corresp" rid="cor001">*</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Miao</surname>
<given-names>Yin</given-names>
</name>
<xref ref-type="aff" rid="aff002">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Yu</surname>
<given-names>Chang-Xiu</given-names>
</name>
<xref ref-type="aff" rid="aff002">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Guo</surname>
<given-names>Wen-Wu</given-names>
</name>
<xref ref-type="aff" rid="aff001">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Xu</surname>
<given-names>Qiang</given-names>
</name>
<xref ref-type="aff" rid="aff001">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Deng</surname>
<given-names>Xiu-Xin</given-names>
</name>
<xref ref-type="aff" rid="aff001">
<sup>1</sup>
</xref>
<xref ref-type="corresp" rid="cor001">*</xref>
</contrib>
</contrib-group>
<aff id="aff001">
<label>1</label>
<addr-line>Key Laboratory of Horticultural Plant Biology (Ministry of Education), Huazhong Agricultural University, Wuhan, 430070, China</addr-line>
</aff>
<aff id="aff002">
<label>2</label>
<addr-line>College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China</addr-line>
</aff>
<contrib-group>
<contrib contrib-type="editor">
<name>
<surname>Li</surname>
<given-names>Maoteng</given-names>
</name>
<role>Editor</role>
<xref ref-type="aff" rid="edit1"></xref>
</contrib>
</contrib-group>
<aff id="edit1">
<addr-line>Huazhong university of Science and Technology, CHINA</addr-line>
</aff>
<author-notes>
<fn fn-type="conflict" id="coi001">
<p>
<bold>Competing Interests: </bold>
The authors have declared that no competing interests exist.</p>
</fn>
<fn fn-type="con" id="contrib001">
<p>Conceived and designed the experiments: CC XD. Performed the experiments: HL YM. Analyzed the data: CC HL YM CY WG QX XD. Contributed reagents/materials/analysis tools: CC WG QX XD. Wrote the paper: CC XD HL.</p>
</fn>
<corresp id="cor001">* E-mail:
<email>chenchunli@mail.hzau.edu.cn</email>
(CC);
<email>xxdeng@mail.hzau.edu.cn</email>
(XD)</corresp>
</author-notes>
<pub-date pub-type="epub">
<day>15</day>
<month>3</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="collection">
<year>2016</year>
</pub-date>
<volume>11</volume>
<issue>3</issue>
<elocation-id>e0151512</elocation-id>
<history>
<date date-type="received">
<day>31</day>
<month>12</month>
<year>2015</year>
</date>
<date date-type="accepted">
<day>29</day>
<month>2</month>
<year>2016</year>
</date>
</history>
<permissions>
<copyright-statement>© 2016 Lan et al</copyright-statement>
<copyright-year>2016</copyright-year>
<copyright-holder>Lan et al</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<license-p>This is an open access article distributed under the terms of the
<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution License</ext-link>
, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</license-p>
</license>
</permissions>
<self-uri content-type="pdf" xlink:type="simple" xlink:href="pone.0151512.pdf"></self-uri>
<abstract>
<p>
<italic>Citrus sinensis</italic>
chromosomes present a morphological differentiation of bands after staining by the fluorochromes CMA and DAPI, but there is still little information on its chromosomal characteristics. In this study, the chromosomes in ‘Valencia’
<italic>C</italic>
.
<italic>sinensis</italic>
were analyzed by fluorescence
<italic>in situ</italic>
hybridization (FISH) using telomere DNA and the 45S rDNA gene as probes combining CMA/DAPI staining, which showed that there were two fragile sites in sweet orange chromosomes co-localizing at distended 45S rDNA regions, one proximally locating on B-type chromosome and the other subterminally locating on D-type chromosome. While the chromosomal CMA banding and 45S rDNA FISH mapping in the doubled haploid line of ‘Valencia’
<italic>C</italic>
.
<italic>sinensis</italic>
indicated six 45S rDNA regions, four were identified as fragile sites as doubled comparing its parental line, which confirmed the cytological heterozygosity and chromosomal heteromorphisms in sweet orange. Furthermore, Ag-NOR identified two distended 45S rDNA regions to be active nucleolar organizing regions (NORs) in diploid ‘Valencia’
<italic>C</italic>
.
<italic>sinensis</italic>
. The occurrence of quadrivalent in meiosis of pollen mother cells (PMCs) in ‘Valencia’ sweet orange further confirmed it was a chromosomal reciprocal translocation line. We speculated this chromosome translocation was probably related to fragile sites. Our data provide insights into the chromosomal characteristics of the fragile sites in ‘Valencia’ sweet orange and are expected to facilitate the further investigation of the possible functions of fragile sites.</p>
</abstract>
<funding-group>
<funding-statement>This research was supported by the National Natural Science Foundation of China (Nos. 31330066, 31221062) to X. Deng, and the Fundamental Research Funds for the Central Universities (2013PY084) to C. Chen.</funding-statement>
</funding-group>
<counts>
<fig-count count="6"></fig-count>
<table-count count="0"></table-count>
<page-count count="15"></page-count>
</counts>
<custom-meta-group>
<custom-meta id="data-availability">
<meta-name>Data Availability</meta-name>
<meta-value>All relevant data are within the paper.</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
<notes>
<title>Data Availability</title>
<p>All relevant data are within the paper.</p>
</notes>
</front>
</pmc>
<affiliations>
<list>
<country>
<li>République populaire de Chine</li>
</country>
</list>
<tree>
<country name="République populaire de Chine">
<noRegion>
<name sortKey="Lan, Hong" sort="Lan, Hong" uniqKey="Lan H" first="Hong" last="Lan">Hong Lan</name>
</noRegion>
<name sortKey="Chen, Chun Li" sort="Chen, Chun Li" uniqKey="Chen C" first="Chun-Li" last="Chen">Chun-Li Chen</name>
<name sortKey="Deng, Xiu Xin" sort="Deng, Xiu Xin" uniqKey="Deng X" first="Xiu-Xin" last="Deng">Xiu-Xin Deng</name>
<name sortKey="Guo, Wen Wu" sort="Guo, Wen Wu" uniqKey="Guo W" first="Wen-Wu" last="Guo">Wen-Wu Guo</name>
<name sortKey="Miao, Yin" sort="Miao, Yin" uniqKey="Miao Y" first="Yin" last="Miao">Yin Miao</name>
<name sortKey="Xu, Qiang" sort="Xu, Qiang" uniqKey="Xu Q" first="Qiang" last="Xu">Qiang Xu</name>
<name sortKey="Yu, Chang Xiu" sort="Yu, Chang Xiu" uniqKey="Yu C" first="Chang-Xiu" last="Yu">Chang-Xiu Yu</name>
</country>
</tree>
</affiliations>
</record>

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