Self-pollination, style length development and seed set in self-compatible Asteraceae: evidence from Senecio vulgaris L.
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Background: Variation in style length has been reported in Senecio vulgaris and has been associated with outcrossing rate. Aims: To determine if (i) long styles lack germinated pollen on stigmas left to self-pollinate, (ii) successful self-pollination causes styles to stop elongating and shrink in length and (iii) seed set increases with the amount of pollen deposited on stigmas. Methods: Determined germinated self-pollen on stigmas of long and short styles after auto-self-pollination; scored style length over 48 h in self-pollinated and non-pollinated florets; recorded seed set after placing different amounts of pollen on stigmas. Results: Most long-styled florets had zero or low amounts of germinated pollen on stigmas in contrast to most short-styled florets. Styles initially elongated to the same length in self-pollinated and non-pollinated florets, then shrank in length in self-pollinated florets while continuing to elongate in non-pollinated florets. Seed set increased with number of pollen grains deposited on stigmas. Conclusions: Successful self-pollen deposition and/or germination on stigmas of S. vulgaris are indicated by presence of short styles, whereas the opposite is indicated by presence of long styles in florets left to self-pollinate. Self-pollination causes styles to shrink after initially elongating. Seed set is dependent on the amount of pollen deposited on stigmas.
Love , J , Graham , S , Irwin , J , Ashton , P , Bretagnolle , F & Abbott , R J 2016 , ' Self-pollination, style length development and seed set in self-compatible Asteraceae: evidence from Senecio vulgaris L. ' Plant Ecology & Diversity , vol 9 , no. 4 , pp. 371-379 . DOI: 10.1080/17550874.2016.1244576
Plant Ecology & Diversity
© 2016 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The work was supported in part by the Natural Environment Research Council under Grants [(GR3/6203A; GR9/1782A] to RJA.
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