Flower visitors in a natural population of Arabidopsis thaliana
Flower visitors in a natural population of Arabidopsis thaliana
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DOI：
10.1055/s-2003-44784
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发表时间：
2003-09-01
期刊：
影响因子：
3.9
通讯作者：
Moritz, G
中科院分区：
文献类型：
--
作者：
Hoffmann, MH;Bremer, M;Moritz, G
拟南芥通常被认为是一种自花授粉植物。在对该物种的种群遗传学研究中，许多令人惊讶的事情之一是在DNA序列中观察到明显的重组痕迹，这可能是罕见的异交事件的结果。我们研究了该物种自然种群中的访花者。在访花的昆虫种类之多中，独居蜜蜂、双翅目和蓟马是最常被观察到的昆虫。假设每次访问等于一次越界事件，则异交率估计为0.84%。这个值介于分子数据和人工系统异交率的估计值之间。尽管访花率相当低，但在野外不能再被认为是完全自花授粉的植物物种。这一观察可以解释在分子分析中观察到的重组事件。在种群遗传分析中，应考虑由于观察到的昆虫的迁移性而可能在种群之间进行的花粉转移。
Arabidopsis thaliana is commonly regarded as a self-pollinated plant species. One of the many surprises in population genetic studies of the species was the observation of distinct traces of recombination in the DNA sequences that may be the result of rare outcrossing events. We studied flower visitors in a natural population of the species. Solitary bees, diptera and thrips are among the most frequently observed insects among the surprising diversity of insects visiting flowers of A. thaliana. Assuming that every visit equals an outcrossing event, the outcrossing rate was estimated to be 0.84%. This value falls between estimations of outcrossing rates from molecular data and those of artificial systems. Despite the rather low rate of flower visitation, A. thaliana can no longer be regarded as a completely self-pollinated plant species in the wild. This observation may explain recombination events observed in molecular analyses. Possible pollen transfer between populations due to the mobility of the observed insects should be considered in population genetic analyses.