Potential inbreeding in a small population of a mass flowering species, Xanthorrhoea johnsonii (Xanthorrhoaceae): is your mother my father?

Article


King, Rachel and Zalucki, Jacinta M.. 2012. "Potential inbreeding in a small population of a mass flowering species, Xanthorrhoea johnsonii (Xanthorrhoaceae): is your mother my father?" American Journal of Plant Sciences. 3 (3), pp. 303-312. https://doi.org/10.4236/ajps.2012.33036
Article Title

Potential inbreeding in a small population of a mass flowering species, Xanthorrhoea johnsonii (Xanthorrhoaceae): is your mother my father?

ERA Journal ID210092
Article CategoryArticle
AuthorsKing, Rachel (Author) and Zalucki, Jacinta M. (Author)
Journal TitleAmerican Journal of Plant Sciences
Journal Citation3 (3), pp. 303-312
Number of Pages10
Year2012
Place of PublicationIrvine, CA. United States
ISSN2158-2742
2158-2750
Digital Object Identifier (DOI)https://doi.org/10.4236/ajps.2012.33036
Web Address (URL)http://www.scirp.org/journal/ajps
Abstract

Xanthorrhoea johnsonii is a long lived slow growing perennial understorey species, that produces a large quantity of passively dispersed seed every 3-5 years. Reproductive maturity is not reached until 20-30 years of age. The temporal asynchrony of the flowering event in this population was analogous to geographic isolation through fragmentation. A small population of plants flowering in isolation provided the opportunity to examine outcrossing rates, genetic diversity and the paternity of progeny at a small spatial scale (0.2 ha). The geographic location and physical characteristics of the adult plants were recorded, and both adults and their seed were sampled for genetic analysis. Four microsatellite loci were screened for genetic diversity and spatial structure analysis. A population outcrossing rate was estimated, as well as the number of paternal parents required to resolve the progeny multilocus genotypes. High genetic diversity was found in both adults and progeny with an estimated 97% outcrossing rate. All maternal lines required several paternal contributors, with no evidence of dominant paternal genotypes. Pollen transfer occurred between both geographically close and distant plants.

KeywordsXanthorrhoaceae; inbreeding; mass flowering; microsatellite; paternity; outcrossing; pollen dispersal; genetic structure; isolated population; Xanthorrhoea johnsonii
ANZSRC Field of Research 2020490501. Applied statistics
310899. Plant biology not elsewhere classified
310599. Genetics not elsewhere classified
Public Notes

This is an Open Access journal.

Byline AffiliationsDepartment of Mathematics and Computing
Griffith University
Institution of OriginUniversity of Southern Queensland
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