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首页> 外文期刊>International journal of plant sciences >MAINTENANCE OF HIGH GENETIC DIVERSITY DURING INVASION OF RHODODENDRON PONTICUM
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MAINTENANCE OF HIGH GENETIC DIVERSITY DURING INVASION OF RHODODENDRON PONTICUM

机译：入侵杜鹃花期间高遗传多样性的维持

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摘要

Adaptive processes in invasive plant populations may explain exotic range expansions and ecotypic shifts between native and invasive populations of the same species. Sufficient genetic variation in invasive populations occurring within the new range is a precondition for selection. While genetic diversity can be considerably reduced during invasions following founder effects and genetic drift, it can also be maintained via mechanisms of effective gene flow. Rhododendron ponticum L., an aggressive invader in the British Isles, is an appropriate test species for investigating changes in genetic diversity and differentiation. Six native populations in Georgia and Spain each and six invasive populations in Ireland were analyzed with amplified fragment length polymorphism markers to calculate genetic distances, genetic diversity, and differentiation within and among populations. While the highest level of genetic diversity was found within native Georgian populations, thus indicating a refugium, native Spanish and invasive Irish populations showed reduced levels of genetic diversity but displayed no further reduction in the invasive range. Genetic differentiation within countries was weak. Spanish and Irish populations showed close relationships supporting a probable Spanish provenance for the invasive Rhododendron. We suggest that the preservation of sufficient genetic variation in invasive R. ponticum populations in Ireland has been vital to the species' adaptation to new environmental conditions.
机译：入侵植物种群的适应性过程可以解释相同物种的本地种群和入侵种群之间的异域范围扩展和生态型转变。在新范围内发生的入侵种群中足够的遗传变异是选择的前提。虽然在创始者效应和遗传漂移之后的入侵过程中，遗传多样性可以大大降低，但也可以通过有效的基因流动机制来维持遗传多样性。杜鹃花杜鹃是侵略性不列颠群岛的侵略性物种，是调查遗传多样性和分化变化的合适测试物种。用扩增的片段长度多态性标记分析了格鲁吉亚和西班牙的六个土著种群以及爱尔兰的六个入侵种群，以计算种群之间和种群之间的遗传距离，遗传多样性和分化。虽然在佐治亚州土著人口中发现了最高水平的遗传多样性，因此表明是避难所，但西班牙土著居民和爱尔兰入侵物种的遗传多样性水平降低了，但入侵范围没有进一步降低。国家内部的遗传分化较弱。西班牙人和爱尔兰人之间的亲密关系显示出入侵杜鹃可能具有西班牙血统。我们建议，在爱尔兰的入侵性ponticum种群中保留足够的遗传变异对于该物种适应新的环境条件至关重要。

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