Evolution of enhanced reproduction in the hybrid-derived invasive, California wild radish (Raphanus sativus)
Evolution of enhanced reproduction in the hybrid-derived invasive, California wild radish (Raphanus sativus)
复制标题
杂交衍生的入侵性加州野生萝卜（Raphanus sativus）的增强繁殖进化
DOI：
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发表时间：
2009
影响因子：
2.9
通讯作者：
N. Ellstrand
中科院分区：
文献类型：
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作者：
C. Ridley;N. Ellstrand
进化作为入侵的一个潜在重要因素正受到越来越多的关注。例如，杂交可能刺激了几种众所周知的植物害虫的入侵性进化。然而，在大多数研究案例中，这种杂交衍生谱系的成功机制仍然未知。在这里，我们问是否增加的生殖成功（在母体适应性方面）已经进化在一个入侵谱系与确认杂交祖先。我们在不同地点和不同年份的田间试验中比较了非本地杂交衍生的加利福尼亚野生萝卜（Raphanus sativus）与其两个祖先物种的相对适合度。我们发现加州野生萝卜在不同的环境下存活率高，每株产生更多的果实，每株产生更多的种子。此外，加州野生萝卜种群表现出强烈的基因型-环境相互作用，表明种群之间遗传和表型多样性的维持可能是杂草能够入侵加州广泛栖息地的原因。我们的研究结果表明，杂交可能有助于增强侵入性的进化，而且，通过限制同源基因的引入和随后的杂交，我们可能能够阻止新的侵入性谱系的进化。
Evolution is receiving increased attention as a potentially important factor in invasions. For example, hybridization may have stimulated the evolution of invasiveness in several well-known plant pests. However, the mechanism for success of such hybrid-derived lineages remains unknown in the majority of the cases studied. Here we ask whether increased reproductive success (in terms of maternal fitness) has evolved in an invasive lineage with confirmed hybrid ancestry. We compare the relative fitness of the non-native, hybrid-derived California wild radish (Raphanus sativus) to that of its two progenitor species in field experiments at different sites and in different years. We found that California wild radish has high survivorship and produces more fruits per plant and more seeds per plant than either of its progenitors in several environments. Furthermore, populations of California wild radish display a strong genotype-by-environment interaction, indicating that maintenance of genetic and phenotypic diversity between populations may be responsible for the weed’s ability to invade a wide breadth of California habitats. Our results suggest that hybridization may contribute the evolution of enhanced invasiveness and, also, that by limiting the introduction and subsequent hybridization of congeners, we may be able to prevent the evolution of new invasive lineages.