Schwaegerle Kent E, Garbutt K, Bazzaz F A
Department of Plant Biology, University of Illinois, Urbana, IL, 61801.
Evolution. 1986 May;40(3):506-517. doi: 10.1111/j.1558-5646.1986.tb00503.x.
The organization of genetic variation in Phlox drummondii was investigated using both allozyme electrophoresis and quantitative genetics. Variation at five polymorphic enzyme loci was characterized in nine populations, and variation in 16 morphological and life-history characters was examined using an analysis of full- and half-sibs in seven populations. Significant levels of genetic variation were found at enzyme loci and for metric characters. Significant heritabilities were observed for 15 of the 16 characters examined. Genetic differences among populations were revealed both by Nei's genetic distance and by phenotypic differences, summarized by discriminant analysis. Partitioning variance in allozyme frequencies among hierarchical levels of genetic organization indicated that 94% of this variance lay within populations, 4% between populations within varieties, and 2% between varieties. Partitioning phenotypic variance for metric characters indicated that 73% lay within populations, 24% lay between populations within varieties, and 3% lay between varieties. Thus, both electrophoretic and metric characters indicated that despite extensive genetic differentiation among populations, most of the evolutionary potential of the species lies within populations.
利用等位酶电泳和数量遗传学方法，对矮牵牛的遗传变异组织进行了研究。在9个种群中对5个多态酶位点的变异进行了表征，并通过对7个种群的全同胞和半同胞分析，研究了16个形态和生活史性状的变异。在酶位点和数量性状上发现了显著水平的遗传变异。在所研究的16个性状中，有15个观察到显著的遗传力。通过Nei氏遗传距离和判别分析总结的表型差异，揭示了种群间的遗传差异。在遗传组织的层次水平上对等位酶频率的方差进行划分，结果表明，94%的方差存在于种群内，4%存在于变种内的种群间，2%存在于变种间。对数量性状的表型方差进行划分，结果表明，73%存在于种群内，24%存在于变种内的种群间，3%存在于变种间。因此，电泳和数量性状均表明，尽管种群间存在广泛的遗传分化，但该物种的大部分进化潜力仍存在于种群内。
