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Titolo:
The spatial structure of sexual and cytonuclear polymorphism in the gynodioecious Beta vulgaris ssp maritima: I - at a local scale
Autore:
Laporte, V; Viard, F; Bena, G; Valero, M; Cuguen, J;
Indirizzi:
Univ Lille 1, Lab Genet & Evolut Populat Vegetales, UPRESA CNRS 8016, FR CNRS 1818, F-59655 Villeneuve Dascq, France Univ Lille 1 Villeneuve Dascq France F-59655 55 Villeneuve Dascq, France
Titolo Testata:
GENETICS
fascicolo: 4, volume: 157, anno: 2001,
pagine: 1699 - 1710
SICI:
0016-6731(200104)157:4<1699:TSSOSA>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
CYTOPLASMIC MALE-STERILITY; CHLOROPLAST DNA POLYMORPHISM; NUCLEAR RESTORER GENES; PLANTAGO-LANCEOLATA L; SEA BEET POPULATIONS; THYMUS-VULGARIS; NATURAL-POPULATIONS; MITOCHONDRIAL-DNA; SUGAR-BEET; DIFFERENTIAL SELECTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
88
Recensione:
Indirizzi per estratti:
Indirizzo: Cuguen, J Univ Lille 1, Lab Genet & Evolut Populat Vegetales, UPRESA CNRS 8016, FR CNRS 1818, Batiment SN2, F-59655 Villeneuve Dascq, France Univ Lille 1 Batiment SN2 Villeneuve Dascq France F-59655 rance
Citazione:
V. Laporte et al., "The spatial structure of sexual and cytonuclear polymorphism in the gynodioecious Beta vulgaris ssp maritima: I - at a local scale", GENETICS, 157(4), 2001, pp. 1699-1710

Abstract

We have analyzed the spatial distribution of the sex phenotypes and of mitochondrial, chloroplast, and nuclear markers within two gynodioecious populations of Beta vulgaris ssp, maritima. Within both populations, sexual phenotype variation is controlled mainly by the cytoplasmic genotype, although in one study population a joint polymorphism of cytonuclear factors is clearly involved. In spite of contrasts in the ecology (mainly due to differenthabitats), a clear common feature in both populations is the highly patchydistribution of cytoplasmic haplotypes, contrasting with the wide distribution of nuclear diversity. This high contrast between cytoplasmic vs. nuclear spatial structure may have important consequences for the maintenance ofgynodioecy. It provides opportunities for differential selection since nuclear restorer alleles are expected to be selected for in the presence of their specific cytoplasmic male sterile (CMS) type, but to be neutral (or selected against if there is a cost of restoration) in the absence of their CMS type. Selective processes in such a cytonuclear landscape may explain thepolymorphism we observed at restorer loci for two CMS types.

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Documento generato il 09/08/20 alle ore 22:46:30