当前位置: X-MOL 学术Front. Ecol. Evolut. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Evaluating assisted gene flow in marginal populations of a high mountain species
Frontiers in Ecology and Evolution ( IF 3 ) Pub Date : 2021-05-07 , DOI: 10.3389/fevo.2021.638837
Samuel Prieto-Benítez , Javier Morente-López , María Luisa Rubio Teso , Carlos Lara-Romero , Alfredo García-Fernández , Elena Torres , José María Iriondo

Many species cannot either migrate or adapt at the rate of temperature increases due to climate warming. Therefore, they need active conservation strategies to avoid extinction. Facilitated adaptation actions, such assisted gene flow, aim at the increase of the evolutionary resilience of species affected by global change. In elevational gradients, marginal populations at the lower elevation edges are experiencing earlier snowmelt and higher temperatures, which force them to adapt to the new conditions by modifying their phenology. In this context, advancing the onset of flowering and seed germination times are crucial to ensure reproductive success and increase seedling survival prior to summer drought. Assisted gene flow may bring adaptive alleles and increase genetic diversity that can help throughout ontogeny. The main aim of this work is to assess the effects that different gene flow treatments could have on the desired trait changes in marginal populations. Accordingly, we established a common garden experiment in which we assayed four different gene flow treatments between Silene ciliata Pourr. (Caryophyllaceae) populations located in similar and different elevation edges, belonging to the same and different mountains. As a control treatment, within-population crosses of low elevation edge populations were performed. The resulting seeds were sown and the germination and flowering onset dates of the resulting plants recorded, as well as the seedling survival. Gene flow between populations falling on the same mountain and same elevation and gene flow from high-elevation populations from a different mountain to low-elevation populations advanced seed germination time with respect to control crosses. No significant effects of gene flow on seedling survival were found. All the gene flow treatments delayed the onset of flowering with respect to control crosses and this effect was more pronounced in among-mountain gene flows. The results of this study highlight two important issues that should be thoroughly studied before attempting to apply assisted gene flow in practical conservation situations. Firstly, among-populations gene flow can trigger different responses in crucial traits throughout the ontogeny of plant species. Secondly, the population provenance of gene flow is determinant and plays a significant role on the effects of gene flow.

中文翻译:

评估高山物种边缘种群的辅助基因流

由于气候变暖,许多物种无法以温度升高的速度迁移或适应。因此,他们需要积极的保护策略来避免灭绝。便利的适应行动,例如辅助基因流动,旨在提高受全球变化影响的物种的进化适应力。在海拔梯度上,较低海拔边缘的边缘种群正经历较早的融雪和较高的温度,这迫使它们通过改变物候来适应新的条件。在这种情况下,延长开花和种子发芽时间的开始对于确保繁殖成功和增加夏季干旱之前的幼苗存活至关重要。辅助的基因流动可能会带来适应性等位基因并增加有助于整个个体发育的遗传多样性。这项工作的主要目的是评估不同基因流处理可能对边缘人群所需的性状变化产生的影响。因此,我们建立了一个常见的花园实验,其中我们分析了Silene ciliata Pourr之间的四种不同的基因流处理。(石竹科)种群位于相似和不同的海拔边缘,属于相同和不同的山脉。作为对照治疗,进行了低海拔边缘种群的种群内杂交。播种所得种子,并记录所得植物的发芽和开花开始日期以及幼苗存活。落在同一山和相同海拔上的种群之间的基因流以及从不同山上的高海拔种群到低海拔种群的基因流相对于控制杂交而言,提前了种子发芽时间。没有发现基因流对幼苗存活的显着影响。所有基因流动处理均相对于对照杂交延迟了开花的开始,并且这种作用在山间基因流动中更为明显。这项研究的结果突出了两个重要的问题,在尝试将辅助基因流应用于实际的保护情况之前,应该彻底研究这些问题。首先,种群间的基因流可以在整个植物个体发育的关键性状上引发不同的反应。第二,
更新日期:2021-05-07
down
wechat
bug