Multilocus half-tetrad analysis and centromere mapping in citrus: evidence of SDR mechanism for 2n megagametophyte production and partial chiasma interference in mandarin cv ‘Fortune'
Identifieur interne : 000D34 ( Ncbi/Checkpoint ); précédent : 000D33; suivant : 000D35Multilocus half-tetrad analysis and centromere mapping in citrus: evidence of SDR mechanism for 2n megagametophyte production and partial chiasma interference in mandarin cv ‘Fortune'
Auteurs : J. Cuenca [Espagne] ; Y. Froelicher [France] ; P. Aleza [Espagne] ; J. Juárez [Espagne] ; L. Navarro [Espagne] ; P. Ollitrault [Espagne, France]Source :
- Heredity [ 0018-067X ] ; 2011.
Abstract
The genetic structure of 2
Url:
DOI: 10.1038/hdy.2011.33
PubMed: 21587302
PubMed Central: 3199928
Affiliations:
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PMC:3199928Le document en format XML
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megagametophyte production and partial chiasma interference in mandarin cv ‘Fortune'</title>
<author><name sortKey="Cuenca, J" sort="Cuenca, J" uniqKey="Cuenca J" first="J" last="Cuenca">J. Cuenca</name>
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, Moncada, Valencia,<country>Spain</country>
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<country xml:lang="fr">Espagne</country>
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<author><name sortKey="Froelicher, Y" sort="Froelicher, Y" uniqKey="Froelicher Y" first="Y" last="Froelicher">Y. Froelicher</name>
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, Montpellier cedex,<country>France</country>
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<country xml:lang="fr">France</country>
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<author><name sortKey="Aleza, P" sort="Aleza, P" uniqKey="Aleza P" first="P" last="Aleza">P. Aleza</name>
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<country xml:lang="fr">Espagne</country>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Multilocus half-tetrad analysis and centromere mapping in citrus: evidence of SDR mechanism for 2<italic>n</italic>
megagametophyte production and partial chiasma interference in mandarin cv ‘Fortune'</title>
<author><name sortKey="Cuenca, J" sort="Cuenca, J" uniqKey="Cuenca J" first="J" last="Cuenca">J. Cuenca</name>
<affiliation wicri:level="1"><nlm:aff id="aff1"><institution>Instituto Valenciano de Investigaciones Agrarias, Centro de Protección Vegetal y Biotecnología, Ctra</institution>
, Moncada, Valencia,<country>Spain</country>
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<country xml:lang="fr">Espagne</country>
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<author><name sortKey="Froelicher, Y" sort="Froelicher, Y" uniqKey="Froelicher Y" first="Y" last="Froelicher">Y. Froelicher</name>
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, Montpellier cedex,<country>France</country>
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<country xml:lang="fr">France</country>
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<author><name sortKey="Aleza, P" sort="Aleza, P" uniqKey="Aleza P" first="P" last="Aleza">P. Aleza</name>
<affiliation wicri:level="1"><nlm:aff id="aff1"><institution>Instituto Valenciano de Investigaciones Agrarias, Centro de Protección Vegetal y Biotecnología, Ctra</institution>
, Moncada, Valencia,<country>Spain</country>
</nlm:aff>
<country xml:lang="fr">Espagne</country>
<wicri:regionArea># see nlm:aff country strict</wicri:regionArea>
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<author><name sortKey="Juarez, J" sort="Juarez, J" uniqKey="Juarez J" first="J" last="Juárez">J. Juárez</name>
<affiliation wicri:level="1"><nlm:aff id="aff1"><institution>Instituto Valenciano de Investigaciones Agrarias, Centro de Protección Vegetal y Biotecnología, Ctra</institution>
, Moncada, Valencia,<country>Spain</country>
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<country xml:lang="fr">Espagne</country>
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<affiliation wicri:level="1"><nlm:aff id="aff1"><institution>Instituto Valenciano de Investigaciones Agrarias, Centro de Protección Vegetal y Biotecnología, Ctra</institution>
, Moncada, Valencia,<country>Spain</country>
</nlm:aff>
<country xml:lang="fr">Espagne</country>
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<author><name sortKey="Ollitrault, P" sort="Ollitrault, P" uniqKey="Ollitrault P" first="P" last="Ollitrault">P. Ollitrault</name>
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, Moncada, Valencia,<country>Spain</country>
</nlm:aff>
<country xml:lang="fr">Espagne</country>
<wicri:regionArea># see nlm:aff country strict</wicri:regionArea>
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, Montpellier cedex,<country>France</country>
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<country xml:lang="fr">France</country>
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<series><title level="j">Heredity</title>
<idno type="ISSN">0018-067X</idno>
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<imprint><date when="2011">2011</date>
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<front><div type="abstract" xml:lang="en"><p>The genetic structure of 2<italic>n</italic>
gametes and, particularly, the parental heterozygosity restitution at each locus depends on the meiotic process by which they originated, with first-division restitution and second-division restitution (SDR) being the two major mechanisms. The origin of 2<italic>n</italic>
gametes in citrus is still controversial, although sexual polyploidisation is widely used for triploid seedless cultivar development. In this study, we report the analysis of 2<italic>n</italic>
gametes of mandarin cv ‘Fortune' by genotyping 171 triploid hybrids with 35 simple sequence repeat markers. The microsatellite DNA allele counting-peak ratios method for allele-dosage evaluation proved highly efficient in segregating triploid progenies and allowed half-tetrad analysis (HTA) by inferring the 2<italic>n</italic>
gamete allelic configuration. All 2<italic>n</italic>
gametes arose from the female genitor. The observed maternal heterozygosity restitution varied between 10 and 82%, depending on the locus, thus SDR appears to be the mechanism underlying 2<italic>n</italic>
gamete production in mandarin cv ‘Fortune'. A new method to locate the centromere, based on the best fit between observed heterozygosity restitution within a linkage group and theoretical functions under either partial or no chiasmata interference hypotheses was successfully applied to linkage group II. The maximum value of heterozygosity restitution and the pattern of restitution along this linkage group would suggest there is partial chiasma interference. The implications of such a restitution mechanism for citrus breeding are discussed.</p>
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<name sortKey="Juarez, J" sort="Juarez, J" uniqKey="Juarez J" first="J" last="Juárez">J. Juárez</name>
<name sortKey="Navarro, L" sort="Navarro, L" uniqKey="Navarro L" first="L" last="Navarro">L. Navarro</name>
<name sortKey="Ollitrault, P" sort="Ollitrault, P" uniqKey="Ollitrault P" first="P" last="Ollitrault">P. Ollitrault</name>
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