The long and the short of it: long-styled florets are associated with higher outcrossing rate in Senecio vulgaris and result from delayed selfpollen germination

Irwin, Judith, Ashton, Paul, Bretagnolle, Francois and Abbott, Richard (2016) The long and the short of it: long-styled florets are associated with higher outcrossing rate in Senecio vulgaris and result from delayed selfpollen germination. Plant Ecology and Diversity, 9 (2). pp. 159-165. ISSN 1755-0874 DOI https://doi.org/10.1080/17550874.2016.1181116

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Abstract

Background: It has been reported that some plants of the self-compatible species Senecio vulgaris produce capitula containing long-styled florets which fail to set seed when left to self-pollinate, although readily set seed when self-pollinated by hand. Aims: To determine if production of long-styled florets is associated with higher outcrossing rate in S. vulgaris, and whether long-styles occur in non-pollinated florets, whereas short-styles are present in self-pollinated florets. Methods: The frequency of long-styled florets was compared in the radiate and non-radiate variants of S. vulgaris, known to exhibit higher and lower outcrossing rates, respectively. In addition, style length was compared in emasculated florets that were either self-pollinated or left non-pollinated. Results: Long-styled florets were more frequent in the higher outcrossing radiate variant. Following emasculation, long styles occurred in non-pollinated florets, while short styles were present in self-pollinated florets. The two variants did not differ in style length within the non-pollinated or within the self-pollinated floret categories. Conclusions: A high frequency of long-styled florets is associated with higher outcrossing rate in S. vulgaris and results from delayed self-pollination and pollen germination on stigmas.

Item Type: Article
Uncontrolled Keywords: Asteraceae; outcrossing rate; pollination; pollen germination; ray and disc florets; selfing; Senecio; style length
Subjects: Q Science > QK Botany
Divisions: Biology
Date Deposited: 01 Dec 2016 10:40
URI: http://repository.edgehill.ac.uk/id/eprint/8309

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