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Genetic rescue reduces mate limitation in a threatened, clonal, and self-incompatible plant species
Restoration Ecology ( IF 2.8 ) Pub Date : 2021-05-28 , DOI: 10.1111/rec.13458
Nora Gavin‐Smyth 1, 2 , Andrea T. Kramer 1, 2 , Rafael Urbina‐Casanova 1, 2 , Pati Vitt 1, 2, 3 , Jeremie B. Fant 1, 2
Affiliation  

Mate limitation is a restoration issue in self-incompatible plant species and can easily go undetected in clonal species when seed set is not directly measured. Populations experiencing mate limitation have low-to-no seed production, and therefore are not demographically viable. The only way to overcome mate limitation in an existing population is genetic rescue, while efforts to restore populations where mate limitation may be an issue should consider mixing source populations. While the merits and challenges of genetic rescue and mixing source populations have been widely debated in the literature, very few long-term examples are available to inform restoration actions. We hypothesized that remnant populations are experiencing mate limitation, while mixed-source populations are not. We tested mate limitation using three treatments: (1) open pollination; (2) controlled crosses within populations; and (3) controlled crosses between nearby populations (genetic rescue). We compared seed set and offspring fitness among cross treatments and by population type. We confirmed that remnant populations are experiencing mate limitation: seed set averaged only 13% with no genetic augmentation, while the genetic rescue treatment increased seed set by an average of 96%. However, for mixed-source populations, no differences were found for seed set with genetic rescue treatment. Offspring fitness did not significantly differ by cross treatment or population status. Results support local genetic rescue and mixed-sourcing as restoration tools for clonal, self-incompatible species.

中文翻译:

遗传拯救减少了受威胁、克隆和自交不相容植物物种的配偶限制

交配限制是自交不相容植物物种的恢复问题,当不直接测量种子集时,很容易在克隆物种中未被发现。经历交配限制的种群几乎没有种子生产,因此在人口统计上不可行。克服现有种群中配偶限制的唯一方法是基因拯救,而在配偶限制可能成为问题的情况下,恢复种群的努力应考虑混合来源种群。虽然遗传拯救和混合源种群的优点和挑战在文献中已经被广泛讨论,但很少有长期的例子可以用来为恢复行动提供信息。我们假设残余种群正在经历配偶限制,而混合来源种群则没有。我们使用三种处理方法测试了配偶限制:(1) 开放授粉;(2) 种群内受控杂交;(3) 控制附近种群之间的杂交(基因拯救)。我们比较了交叉处理和种群类型之间的种子集和后代适应度。我们证实剩余种群正在经历交配限制:在没有遗传增强的情况下,种子集平均只有 13%,而基因拯救处理使种子集平均增加了 96%。然而,对于混合源种群,基因拯救处理的种子集没有发现差异。后代适应度在交叉治疗或种群状况方面没有显着差异。结果支持本地基因拯救和混合采购作为克隆、自交不相容物种的恢复工具。(3) 控制附近种群之间的杂交(基因拯救)。我们比较了交叉处理和种群类型之间的种子集和后代适应度。我们证实剩余种群正在经历交配限制:在没有遗传增强的情况下,种子集平均只有 13%,而基因拯救处理使种子集平均增加了 96%。然而,对于混合源种群,基因拯救处理的种子集没有发现差异。后代适应度在交叉治疗或种群状况方面没有显着差异。结果支持本地基因拯救和混合采购作为克隆、自交不相容物种的恢复工具。(3) 控制附近种群之间的杂交(基因拯救)。我们比较了交叉处理和种群类型之间的种子集和后代适应度。我们证实剩余种群正在经历交配限制:在没有遗传增强的情况下,种子集平均只有 13%,而基因拯救处理使种子集平均增加了 96%。然而,对于混合源种群,基因拯救处理的种子集没有发现差异。后代适应度在交叉治疗或种群状况方面没有显着差异。结果支持本地基因拯救和混合采购作为克隆、自交不相容物种的恢复工具。在没有遗传增强的情况下,种子集平均只有 13%,而基因拯救处理使种子集平均增加了 96%。然而,对于混合源种群,基因拯救处理的种子集没有发现差异。后代适应度在交叉治疗或种群状况方面没有显着差异。结果支持本地基因拯救和混合采购作为克隆、自交不相容物种的恢复工具。在没有遗传增强的情况下,种子集平均只有 13%,而基因拯救处理使种子集平均增加了 96%。然而,对于混合源种群,基因拯救处理的种子集没有发现差异。后代适应度在交叉治疗或种群状况方面没有显着差异。结果支持本地基因拯救和混合采购作为克隆、自交不相容物种的恢复工具。
更新日期:2021-05-28
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