GENETIC VARIATION AND THE BREEDING SYSTEM OF GILIA ACHILLEIFOLIA
GENETIC VARIATION AND THE BREEDING SYSTEM OF GILIA ACHILLEIFOLIA
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DOI：
10.1111/j.1558-5646.1982.tb05052.x
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发表时间：
1982-03
期刊：
影响因子：
3.3
通讯作者：
D. Schoen
中科院分区：
文献类型：
--
作者：
D. Schoen
进化遗传学和生殖生物学的一组核心问题涉及育种系统对种群和种群集合中遗传变异的数量和结构的影响。这一主题已经从理论的角度进行了探讨，预计近交群体的杂合性较低，遗传多样性较低，并且与远交群体相比彼此之间的分化程度更高（Wright，1921，1969; Mather，1943; Stebbins，1950，1957; Baker，1953; Grant，1958; Allard等人，1968年）。对具有对比育种系统的植物物种的等位酶调查支持了这些期望（例如，Solbrig，1972; Gottlieb，1973，1974，1975; Babbel和Selander，1974; Schaal，1975; Levin，1977，1978; Brown和Jain，1979）。但是，为了检查育种系统对遗传变异水平的影响，种内研究是有价值的，因为它们允许在密切相关的种群之间进行比较。对含有自花授粉和异交种群的物种内的遗传变异的研究相对较少（Rick et al.，1977; Rick等人，1979年）。此外，在大多数研究中，遗传变异的测量并不伴随着异交率的估计，因此不提供自花授粉是否会导致预期杂合性降低程度的信息。这项调查的目的是估计一个物种的遗传变异的数量和结构，
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