{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T14:38:27Z","timestamp":1772116707907,"version":"3.50.1"},"reference-count":23,"publisher":"The Royal Society","issue":"1434","license":[{"start":{"date-parts":[[2003,6,29]],"date-time":"2003-06-29T00:00:00Z","timestamp":1056844800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/royalsociety.org\/journals\/ethics-policies\/data-sharing-mining\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Phil. Trans. R. Soc. Lond. B"],"published-print":{"date-parts":[[2003,6,29]]},"abstract":"<jats:p><jats:italic>Senecio squalidus<\/jats:italic>L. (Asteraceae) has been the subject of several ecological and population genetic studies due to its well\u2013documented history of introduction, establishment and spread throughout Britain in the past 300 years. Our recent studies have focused on identifying and quantifying factors associated with the sporophytic self\u2013incompatibility (SSI) system of<jats:italic>S. squalidus<\/jats:italic>that may have contributed to its success as a colonist. These findings are of general biological interest because they provide important insights into the short\u2013term evolutionary dynamics of a plant mating system. The number of<jats:italic>S<\/jats:italic>\u2013alleles in populations and their dominance interactions were investigated in eight wild British populations using cross\u2013diallel studies. The numbers of<jats:italic>S<\/jats:italic>\u2013alleles in British<jats:italic>S. squalidus<\/jats:italic>populations are typically low (average of 5.3<jats:italic>S<\/jats:italic>\u2013alleles) and the entire British population is estimated to possess no more than 7\u201311<jats:italic>S<\/jats:italic>\u2013alleles. Such low numbers of<jats:italic>S<\/jats:italic>\u2013alleles are most probably a consequence of population bottlenecks associated with introduction and colonization. Potential evolutionary impacts on SSI caused by a paucity of<jats:italic>S<\/jats:italic>\u2013alleles, such as restricted mate availability, are discussed, and we suggest that increased dominance interactions between<jats:italic>S<\/jats:italic>\u2013alleles may be an important short\u2013term means of increasing mate availability when<jats:italic>S<\/jats:italic>\u2013allele numbers are low.<\/jats:p>","DOI":"10.1098\/rstb.2003.1300","type":"journal-article","created":{"date-parts":[[2003,9,9]],"date-time":"2003-09-09T15:27:32Z","timestamp":1063121252000},"page":"1047-1050","source":"Crossref","is-referenced-by-count":39,"title":["The population genetics of sporophytic self\u2013incompatibility in<i>Senecio squalidus<\/i>L. (Asteraceae): avoidance of mating constraints imposed by low<i>S<\/i>\u2013allele number"],"prefix":"10.1098","volume":"358","author":[{"given":"Adrian C.","family":"Brennan","sequence":"first","affiliation":[{"name":"Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK"}]},{"given":"Stephen A.","family":"Harris","sequence":"additional","affiliation":[{"name":"Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK"}]},{"given":"Simon J.","family":"Hiscock","sequence":"additional","affiliation":[{"name":"School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK"}]}],"member":"175","published-online":{"date-parts":[[2003,6,29]]},"reference":[{"key":"p_90","doi-asserted-by":"publisher","DOI":"10.1038\/hdy.1993.119"},{"key":"p_91","doi-asserted-by":"publisher","DOI":"10.1111\/j.1558-5646.1967.tb03440.x"},{"key":"p_92","doi-asserted-by":"crossref","unstructured":"Brennan A. C. 2003 The population genetics of sporophytic self-incompatibility in Senecio squalidus L. (Asteraceae). DPhil thesis University of Oxford UK.","DOI":"10.1038\/sj.hdy.6800159"},{"key":"p_93","doi-asserted-by":"publisher","DOI":"10.1038\/sj.hdy.6800159"},{"key":"p_94","doi-asserted-by":"crossref","unstructured":"Brennan A. C. Harris S. A. & Hiscock S. J. 2003 The population genetics of sporophytic self-incompatibility in Senecio squalidus L. (Asteraceae) II: a combined spatial autocorrelational and ecological approach to determining mating behaviour in the presence of low S allele diversity. Heredity. (In the press.)","DOI":"10.1038\/sj.hdy.6800315"},{"key":"p_95","doi-asserted-by":"publisher","DOI":"10.1038\/hdy.1992.50"},{"key":"p_96","doi-asserted-by":"publisher","DOI":"10.1105\/tpc.12.3.309"},{"key":"p_97","doi-asserted-by":"publisher","DOI":"10.1046\/j.1523-1739.1993.07030542.x"},{"key":"p_98","first-page":"31","article-title":"Introduction of Oxford ragwort, Senecio squalidus L. 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