A novel mating system analysis for modes of self-oriented mating applied to diploid and polyploid arctic Easter daisies (Townsendia hookeri).

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Thompson, Stacey LeeDepartment of Botany and Centre for Biodiversity Research, University of British Columbia, Vancouver, British Columbia, Canada (författare)

A novel mating system analysis for modes of self-oriented mating applied to diploid and polyploid arctic Easter daisies (Townsendia hookeri).

Artikel/kapitelEngelska2006

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2006-05-24
Nature Publishing Group,2006
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LIBRIS-ID:oai:DiVA.org:umu-67101
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-67101URI
https://doi.org/10.1038/sj.hdy.6800844DOI

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Språk:engelska
Sammanfattning på:engelska

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We have developed a new model for mating system analysis, which attempts to distinguish among alternative modes of self-oriented mating within populations. This model jointly estimates the rates of outcrossing, selfing, automixis and apomixis, through the use of information in the family structure given by dominant genetic marker data. The method is presented, its statistical properties evaluated, and is applied to three arctic Easter daisy populations, one consisting of diploids, the other two of tetraploids. The tetraploids are predominantly male sterile and reported to be apomictic while the diploids are male fertile. In each Easter daisy population, 10 maternal arrays of six progeny were assayed for amplified fragment length polymorphism markers. Estimates, confirmed with likelihood ratio tests of mating hypotheses, showed apomixis to be predominant in all populations (ca. 70%), but selfing or automixis was moderate (ca. 25%) in tetraploids. It was difficult to distinguish selfing from automixis, and simulations confirm that with even very large sample sizes, the estimates have a very strong negative statistical correlation, for example, they are not independent. No selfing or automixis was apparent in the diploid population, instead, moderate levels of outcrossing were detected (23%). Low but significant levels of outcrossing (2-4%) seemed to occur in the male-sterile tetraploid populations; this may be due to genotyping error of this level. Overall, this study shows apomixis can be partial, and provides evidence for higher levels of inbreeding in polyploids compared to diploids and for significant levels of apomixis in a diploid plant population.

Ämnesord och genrebeteckningar

NATURVETENSKAP Biologi hsv//swe
NATURAL SCIENCES Biological Sciences hsv//eng
apomixis
automixis
autopolyploidy
mating system estimation
outcrossing
selfing

Biuppslag (personer, institutioner, konferenser, titlar ...)

Ritland, Kermit (författare)
Department of Botany and Centre for Biodiversity Research, University of British Columbia, Vancouver, British Columbia, Canada (creator_code:org_t)

Sammanhörande titlar

Ingår i:Heredity: Nature Publishing Group97:2, s. 119-1260018-067X1365-2540

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Av författaren/redakt...: Thompson, Stacey ...; Ritland, Kermit

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NATURVETENSKAP: NATURVETENSKAP; och Biologi

Artiklar i publikationen: Heredity

Av lärosätet: Umeå universitet

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