Higher levels of multiple paternities increase seedling survival in the long-lived tree Eucalyptus gracilis.
Higher levels of multiple paternities increase seedling survival in the long-lived tree Eucalyptus gracilis.
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DOI：
10.1371/journal.pone.0090478
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Lowe AJ
中科院分区：
文献类型：
--
作者：
Breed MF;Christmas MJ;Lowe AJ
研究交配系统参数和健身树木的自然种群之间的关联，我们了解当地环境如何影响种子质量，从而有助于预测近亲繁殖或多个父系应该影响健身。事实上，对于表现出避免近亲繁殖的物种，多个父系（即每个半同胞家庭的父本数量）仍然应该变化，并比近亲繁殖更能调节适应性-在此称为“限制近亲繁殖假说”。我们测试这一假设，在桉树，主要是昆虫授粉树。从三个种群的树木中收集了58个自由授粉后代阵列。后代在相互移植试验中种植。健康是通过家庭建立率来衡量的。我们在8个微卫星位点对所有树木及其后代进行基因分型。种源和种源×种地对适合度影响不显著。种群具有可比的交配系统参数，一般是异交，经历了低双亲近亲繁殖和高水平的多个父系。正如预测的那样，种子家庭，有更多的多重父系也有较高的适应度，没有适合度近亲繁殖的相关性。证明多个父系，而不是近亲繁殖，健身的影响最大，我们提供的证据支持的约束近亲繁殖的假设，即多个父系可能会影响健身以上的近亲繁殖，特别是优先异交的树木在种子发育以外的生命阶段。
Studying associations between mating system parameters and fitness in natural populations of trees advances our understanding of how local environments affect seed quality, and thereby helps to predict when inbreeding or multiple paternities should impact on fitness. Indeed, for species that demonstrate inbreeding avoidance, multiple paternities (i.e. the number of male parents per half-sib family) should still vary and regulate fitness more than inbreeding – named here as the ‘constrained inbreeding hypothesis’. We test this hypothesis in Eucalyptus gracilis, a predominantly insect-pollinated tree. Fifty-eight open-pollinated progeny arrays were collected from trees in three populations. Progeny were planted in a reciprocal transplant trial. Fitness was measured by family establishment rates. We genotyped all trees and their progeny at eight microsatellite loci. Planting site had a strong effect on fitness, but seed provenance and seed provenance × planting site did not. Populations had comparable mating system parameters and were generally outcrossed, experienced low biparental inbreeding and high levels of multiple paternity. As predicted, seed families that had more multiple paternities also had higher fitness, and no fitness-inbreeding correlations were detected. Demonstrating that fitness was most affected by multiple paternities rather than inbreeding, we provide evidence supporting the constrained inbreeding hypothesis; i.e. that multiple paternity may impact on fitness over and above that of inbreeding, particularly for preferentially outcrossing trees at life stages beyond seed development.
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影响因子：
56.9
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