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GENETIC VARIATION AND THE BREEDING SYSTEM OF GILIA ACHILLEIFOLIA

A central group of questions in evolutionary genetics and reproductive biology concerns the influence of the breeding system on the amount and structuring of genetic variation in populations and in collections of populations. This topic has been approached from the standpoint of theory, and populations of inbreeders are expected to be less heterozygous, contain less genetic diversity, and be more highly differentiated from one another than populations of outbreeders (Wright, 1921, 1969; Mather, 1943; Stebbins, 1950, 1957; Baker, 1953; Grant, 1958; Allard et al., 1968). Allozyme surveys of plant species with contrasting breeding systems lend support to these expectations (e.g., Solbrig, 1972; Gottlieb, 1973, 1974, 1975; Babbel and Selander, 1974; Schaal, 1975; Levin, 1977, 1978; and Brown and Jain, 1979). But to examine the affect of the breeding system on levels of genetic variation, intraspecific studies are valuable since they allow comparisons to be made among closely related populations. There have been relatively few studies of genetic variation within species containing both self-pollinating and outcrossing populations (Rick et al., 1977; Rick et al., 1979). Furthermore, in most studies, measures of genetic variation are not accompanied by estimates of the outcrossing rate, and so do not provide information as to whether self-pollination leads to the expected degree of reduction in heterozygosity. This investigation was initiated to estimate the amount and structuring of genetic variation in a species containing both