Outcrossing rates and reproductive success in xanthorrhoea johnsonii (xanthorrhoeaceae), in south east Queensland, Australia

Article


Zalucki, Jacinta M., King, Rachel and Hughes, Jane M.. 2013. "Outcrossing rates and reproductive success in xanthorrhoea johnsonii (xanthorrhoeaceae), in south east Queensland, Australia." Biological Journal of the Linnean Society. 110 (2), pp. 335-345. https://doi.org/10.1111/bij.12135
Article Title

Outcrossing rates and reproductive success in xanthorrhoea johnsonii (xanthorrhoeaceae), in south east Queensland, Australia

ERA Journal ID2054
Article CategoryArticle
AuthorsZalucki, Jacinta M. (Author), King, Rachel (Author) and Hughes, Jane M. (Author)
Journal TitleBiological Journal of the Linnean Society
Journal Citation110 (2), pp. 335-345
Number of Pages11
Year2013
Place of PublicationChichester, West Sussex. United Kingdom
ISSN0024-4066
1095-8312
Digital Object Identifier (DOI)https://doi.org/10.1111/bij.12135
Web Address (URL)http://onlinelibrary.wiley.com/doi/10.1111/bij.12135/pdf
Abstract

Outcrossing rates and seed set were estimated at both the population and individual plant scale within four populations of Xanthorrhoea johnsonii. Sites differed with respect to habitat disturbance (time since fire), plant density, mean plant height, and mean inflorescence length. Allozyme data from progeny arrays of 24 seeds per plant from ten plants at each site were used to determine maternal outcrossing rates, which were found to be consistently high at all sites (>90%). Small but significant levels of inbreeding were recorded at three of the four sites. There was close agreement between tm and ts measures, which indicated that most inbreeding was a result of within plant selfing rather than biparental inbreeding. Outcrossing rates were estimated within top, middle, and bottom thirds of spikes on six plants at a fifth site. Significant differences from complete outcrossing were recorded in the middle and/or bottom sections of three plants. Total seed set per plant and seed set per flower varied significantly among the four sites. Xanthorrhoea johnsonii appears to be able to maintain relatively high outcrossing rates under different ecological conditions, although levels of both seed set per plant and seed set per flower are much more variable.

Keywordsflowering density; fragmented populations; long-lived perennial; mating systems; plant age; seed set; blackboy; Australia; grasstree
ANZSRC Field of Research 2020490102. Biological mathematics
310804. Plant developmental and reproductive biology
310599. Genetics not elsewhere classified
Public Notes

© 2013 The Linnean Society of London. Published online 24 Jul 2013.
Published version deposited in accordance with the copyright policy of the publisher.

Byline AffiliationsGriffith University
Department of Mathematics and Computing
Institution of OriginUniversity of Southern Queensland
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