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'Senecio squalidus L.' 
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Partager le résultat de cette rechercheOutcrossing rate and self-incompatibility in the colonizing species Senecio squalidus / Richard Abbott in Heredity, 71 (2) (1993)
Titre : Outcrossing rate and self-incompatibility in the colonizing species Senecio squalidus Type de document : Imprimé Auteurs : Richard Abbott ; D.G. Forbes Année de publication : 1993 Article en page(s) : 155-159 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Biologie de la reproduction Mots-clés : Senecio Senecio squalidus L. Résumé : Levels of outcrossing and self-compatibility were estimated in two populations of Senecio squalidus, a highly successful colonizing species in the U.K. In both populations there was a tendency for outcrossing rate, t, to be depressed below unity in early summer; however, in neither instance was the departure from unity significant. Samples collected in early autumn also exhibited outcrossing rates not significantly different from t=1. Levels of self-compatibility measured in terms of seed set on selfing, were very low in all material tested. This finding plus the results of a crossing programme, provides evidence that British S. squalidus possesses a highly effective self-incompatibility system, most probably of the homomorphic sporophytic type. It is concluded that mating normally occurs at random in British populations of S. squalidus, although some degree of biparental inbreeding may also occur. The latter would cause inbreeding coefficients to exceed zero as recorded in a number of populations previously studied. The ability of S. squalidus to colonize new sites without engaging in uniparental sexual or asexual reproduction is briefly discussed. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137472
in Heredity > 71 (2) (1993) . - 155-159Abbott, Richard, Forbes, D.G. 1993 Outcrossing rate and self-incompatibility in the colonizing species Senecio squalidus. Heredity, 71(2): 155-159.Documents numériques
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Article (1993)Adobe Acrobat PDFThe different mechanism of sporophytic self-incompatibility / Simon John Hiscock (2003)
Titre : The different mechanism of sporophytic self-incompatibility Type de document : Tiré à part de revue Auteurs : Simon John Hiscock ; David A. Tabah Année de publication : 2003 Importance : 1037-1045 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Biologie de la reproduction Mots-clés : Brassica Senecio squalidus L. Résumé : Flowering plants have evolved a multitude of mechanisms to avoid self-fertilization and promote outbreeding. Self-incompatibility (SI) is by far the most common of these, and is found in ca. 60% of flowering plants. SI is a genetically controlled pollen-pistil recognition system that provides a barrier to fertilization by self and self-related pollen in hermaphrodite (usually co-sexual) flowering plants. Two genetically distinct forms of SI can be recognized: gametophytic SI (GSI) and sporophytic SI (SSI), distinguished by how the incompatibility phenotype of the pollen is determined. GSI appears to be the most common mode of SI and can operate through at least three different mechanisms, two of which have been characterized extensively at a molecular level in the Solanaceae and Papaveraceae. Because molecular studies of SSI have been largely confined to species from the Brassicaceae, predominantly Brassica species, it is not yet known whether SSI, like GSI, can operate through different molecular mechanisms. Molecular studies of SSI are now being carried out on Ipomoea trifida (Convolvulaceae) and Senecio squalidus (Asteraceae) and are providing important preliminary data suggesting that SSI in these two families does not share the same molecular mechanism as that of the Brassicaceae. Here, what is currently known about the molecular regulation of SSI in the Brassicaceae is briefly reviewed, and the emerging data on SSI in I. trifida, and more especially in S. squalidus, are discussed. Lien pérenne : DOI : 10.1098/rstb.2003.1297 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=131233 Hiscock, Simon John, Tabah, David A. 2003 The different mechanism of sporophytic self-incompatibility. Phil. Trans. Royal Society London, 358 : 1037-1045.Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 13740 Hiscock Tiré à part Centre de documentation Tirés à part Consultable
