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首页> 美国卫生研究院文献>Heredity >Evolution of nickel hyperaccumulation and serpentine adaptation in the Alyssum serpyllifolium species complex
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Evolution of nickel hyperaccumulation and serpentine adaptation in the Alyssum serpyllifolium species complex

机译：香雪球菌种复合物中镍超积累和蛇纹石适应性的演变

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Metal hyperaccumulation is an uncommon but highly distinctive adaptation found in certain plants that can grow on metalliferous soils. Here we review what is known about evolution of metal hyperaccumulation in plants and describe a population-genetic analysis of the Alyssum serpyllifolium (Brassicaceae) species complex that includes populations of nickel-hyperaccumulating as well as non-accumulating plants growing on serpentine (S) and non-serpentine (NS) soils, respectively. To test whether the S and NS populations belong to the same or separate closely related species, we analysed genetic variation within and between four S and four NS populations from across the Iberian peninsula. Based on microsatellites, genetic variation was similar in S and NS populations (average Ho=0.48). The populations were significantly differentiated from each other (overall FST=0.23), and the degree of differentiation between S and NS populations was similar to that within these two groups. However, high S versus NS differentiation was observed in DNA polymorphism of two genes putatively involved in adaptation to serpentine environments, IREG1 and NRAMP4, whereas no such differentiation was found in a gene (ASIL1) not expected to play a specific role in ecological adaptation in A. serpyllifolium. These results indicate that S and NS populations belong to the same species and that nickel hyperaccumulation in A. serpyllifolium appears to represent a case of adaptation to growth on serpentine soils. Further functional and evolutionary genetic work in this system has the potential to significantly advance our understanding of the evolution of metal hyperaccumulation in plants.
机译：在某些可以在含金属的土壤中生长的植物中，金属过度富集是一种罕见但高度独特的适应性变化。在这里，我们回顾一下有关植物中金属过度富集进化的已知知识，并描述对香雪草（芸苔科）物种复合体的种群遗传分析，其中包括镍超积累以及非积累的在蛇纹石（S）和非蛇纹石（NS）土壤。为了检验S和NS种群是否属于相同或独立的密切相关物种，我们分析了整个伊比利亚半岛的4个S和4个NS种群内部和之间的遗传变异。基于微卫星，S和NS种群的遗传变异相似（平均Ho = 0.48）。种群之间存在显着差异（总体FST = 0.23），S和NS种群之间的分化程度与两组相似。然而，在假定参与蛇形环境调节的两个基因IREG1和NRAMP4的DNA多态性中观察到了高S与NS的分化，而在预期在生态适应性中不发挥特定作用的基因（ASIL1）中未发现这种分化。 A. serpyllifolium。这些结果表明，S和NS种群属于同一物种，而蛇形拟南芥中的镍超富集似乎代表了对蛇形土壤生长的适应情况。在该系统中进行进一步的功能和进化遗传工作可能会极大地促进我们对植物中金属超富集进化的理解。

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