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Pollen competition among two species of Senecio (Asteraceae) that form a hybrid zone on Mt. Etna, Sicily

Pollen competition among two species of Senecio (Asteraceae) that form a hybrid zone on Mt. Etna, Sicily
Pollen competition among two species of Senecio (Asteraceae) that form a hybrid zone on Mt. Etna, Sicily
Hybridization between interfertile, sympatric or parapatric, plant species can be reduced significantly by conspecific pollen advantage (CPA), whereby conspecific pollen has an advantage over heterospecific pollen in terms of ovule fertilization. We examined CPA in two interfertile species of Senecio, S. aethnensis, and S. chrysanthemifolius (Asteraceae), which form a hybrid zone on Mt. Etna, Sicily. Individuals of both species were pollinated with pollen mixtures containing 0, 25, 50, 75, or 100% heterospecific pollen, and offspring were genotyped to determine if they were products of conspecific or heterospecific pollen fertilizing the ovules. The mean proportion of hybrid offspring produced on S. aethnensis plants was not significantly different to that expected based on the proportion of heterospecific pollen applied to the flower head. However, S. chrysanthemifolius mother plants showed moderate CPA, with the proportion of hybrid offspring significantly less than expected. Seed set or seed germination was not reduced, hence the CPA found for S. chrysanthemifolius acts before ovule fertilization. The consequences of asymmetry in CPA on the reproductive isolation of S. aethnensis are briefly discussed, along with other mechanisms that may play a role in the maintenance of the hybrid zone on Mt. Etna.
asteraceae, hybrid zone, introgression, mt. rtna, pollen competition, reproductive isolation, senecio
0002-9122
730-735
Chapman, M.A.
8bac4a92-bfa7-4c3c-af29-9af852ef6383
Forbes, D.G.
0f46b169-4ecc-4586-923f-c0686430f4b8
Abbott, R.J.
545fd905-c335-405d-ae47-1c7cef35de67
Chapman, M.A.
8bac4a92-bfa7-4c3c-af29-9af852ef6383
Forbes, D.G.
0f46b169-4ecc-4586-923f-c0686430f4b8
Abbott, R.J.
545fd905-c335-405d-ae47-1c7cef35de67

Chapman, M.A., Forbes, D.G. and Abbott, R.J. (2005) Pollen competition among two species of Senecio (Asteraceae) that form a hybrid zone on Mt. Etna, Sicily. American Journal of Botany, 92 (4), 730-735. (doi:10.3732/ajb.92.4.730).

Record type: Article

Abstract

Hybridization between interfertile, sympatric or parapatric, plant species can be reduced significantly by conspecific pollen advantage (CPA), whereby conspecific pollen has an advantage over heterospecific pollen in terms of ovule fertilization. We examined CPA in two interfertile species of Senecio, S. aethnensis, and S. chrysanthemifolius (Asteraceae), which form a hybrid zone on Mt. Etna, Sicily. Individuals of both species were pollinated with pollen mixtures containing 0, 25, 50, 75, or 100% heterospecific pollen, and offspring were genotyped to determine if they were products of conspecific or heterospecific pollen fertilizing the ovules. The mean proportion of hybrid offspring produced on S. aethnensis plants was not significantly different to that expected based on the proportion of heterospecific pollen applied to the flower head. However, S. chrysanthemifolius mother plants showed moderate CPA, with the proportion of hybrid offspring significantly less than expected. Seed set or seed germination was not reduced, hence the CPA found for S. chrysanthemifolius acts before ovule fertilization. The consequences of asymmetry in CPA on the reproductive isolation of S. aethnensis are briefly discussed, along with other mechanisms that may play a role in the maintenance of the hybrid zone on Mt. Etna.

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More information

Published date: April 2005
Keywords: asteraceae, hybrid zone, introgression, mt. rtna, pollen competition, reproductive isolation, senecio
Organisations: Centre for Biological Sciences

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Local EPrints ID: 352745
URI: https://eprints.soton.ac.uk/id/eprint/352745
ISSN: 0002-9122
PURE UUID: 18c41756-c1e0-4594-baf7-ce40cf0fd72f
ORCID for M.A. Chapman: ORCID iD orcid.org/0000-0002-7151-723X

Catalogue record

Date deposited: 04 Jun 2013 14:12
Last modified: 06 Jun 2018 12:25

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Author: M.A. Chapman ORCID iD
Author: D.G. Forbes
Author: R.J. Abbott

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