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Genetic Variation and the Breeding System of Gilia achilleifolia

Daniel J. Schoen
Evolution
Vol. 36, No. 2 (Mar., 1982), pp. 361-370
DOI: 10.2307/2408055
Stable URL: http://www.jstor.org/stable/2408055
Page Count: 10
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Genetic Variation and the Breeding System of Gilia achilleifolia
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Abstract

Allozyme variation was compared in selfing and outcrossing populations of Gilia achilleifolia. A group of selfing populations in the northern part of the distribution and a group of outcrossing populations in the southern part of the distribution contained similar amounts of genetic variation; however, individual selfing populations contained less genetic variation than individual outcrossing populations. Most of this difference was in number of alleles per locus and percent loci polymorphic per population. Selfing populations had higher heterozygote frequencies than expected based on knowledge of their outcrossing rate. Evidence is presented that suggests some of the heterozygosity excess is the result of selection. As selfing and outcrossing populations fall into distinct geographical groups, it was possible to study the apportionment of genetic diversity within each group. The among population component of genetic diversity in the selfing group was larger than that of the outcrossing group. In general, the relationship between breeding system and amount and structuring of genetic variation in G. achilleifolia agrees with theoretical considerations and with comparisons that have been made interspecifically in several plant genera.

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