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

Zalucki, Jacinta M. and 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. ISSN 0024-4066

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2013 The Linnean Society of London. Published online 24 Jul 2013. Published version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 30 Jul 2013 23:44
Last Modified: 04 Nov 2014 01:42
Uncontrolled Keywords: flowering density; fragmented populations; long-lived perennial; mating systems; plant age; seed set; blackboy; Australia; grasstree
Fields of Research : 01 Mathematical Sciences > 0102 Applied Mathematics > 010202 Biological Mathematics
06 Biological Sciences > 0607 Plant Biology > 060703 Plant Developmental and Reproductive Biology
06 Biological Sciences > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics
Socio-Economic Objective: D Environment > 96 Environment > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales
Identification Number or DOI: 10.1111/bij.12135
URI: http://eprints.usq.edu.au/id/eprint/23822

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