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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Complete congruence between gene diversity estimates derived from genotypic data at enzyme and random amplified polymorphic DNA loci in black spruce.
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Complete congruence between gene diversity estimates derived from genotypic data at enzyme and random amplified polymorphic DNA loci in black spruce.

机译：从酶的基因型数据得出的基因多样性估计与黑云杉中随机扩增的多态性DNA基因座之间的完全一致性。

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摘要

Controversy still exists over the adaptive nature of variation of enzyme loci. In conifers, random amplified polymorphic DNAs (RAPDs) represent a class of marker loci that is unlikely to fall within or be strongly linked to coding DNA. We have compared the genetic diversity in natural populations of black spruce [Picea mariana (Mill.) B.S.P.] using genotypic data at allozyme loci and RAPD loci as well as phenotypic data from inferred RAPD fingerprints. The genotypic data for both allozymes and RAPDs were obtained from at least six haploid megagametophytes for each of 75 sexually mature individuals distributed in five populations. Heterozygosities and population fixation indices were in complete agreement between allozyme loci and RAPD loci. In black spruce, it is more likely that the similar levels of variation detected at both enzyme and RAPD loci are due to such evolutionary forces as migration and the mating system, rather than to balancing selection and overdominance. Furthermore, we show that biased estimates of expected heterozygosity and among-population differentiation are obtained when using allele frequencies derived from dominant RAPD phenotypes.
机译：酶基因座变异的适应性仍然存在争议。在针叶树中，随机扩增的多态性DNA（RAPD）代表了一类标记位点，该位点不太可能落入编码DNA或与之紧密连接。我们使用同工酶基因座和RAPD基因座的基因型数据以及RAPD指纹推断的表型数据，比较了黑云杉[Picea mariana（Mill。）B.S.P.]自然种群的遗传多样性。从分布在五个人群中的75个性成熟个体中的每一个，至少从六个单倍体巨配子体获得了同工酶和RAPD的基因型数据。异源酶基因座和RAPD基因座之间的杂合性和种群固定指数完全一致。在黑云杉中，很有可能在酶和RAPD基因座上检测到的相似水平的变异是由于诸如迁移和交配系统之类的进化力，而不是平衡选择和优势。此外，我们显示当使用衍生自主要RAPD表型的等位基因频率时，可获得对预期杂合性和种群间分化的偏倚估计。

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