Nora Sofia, Aparicio Abelardo, Albaladejo Rafael G
Departmento de Biología Vegetal y Ecología, Universidad de Sevilla, Seville, Spain.
PLoS One. 2016 Nov 11;11(11):e0166023. doi: 10.1371/journal.pone.0166023. eCollection 2016.
Anthropogenic habitat deterioration can promote changes in plant mating systems that subsequently may affect progeny performance, thereby conditioning plant recruitment for the next generation. However, very few studies yet tested mating system parameters other than outcrossing rates; and the direct effects of the genetic diversity of the pollen received by maternal plants (i.e. correlated paternity) has often been overlooked. In this study, we investigated the relation between correlated paternity and progeny performance in two common Mediterranean shrubs, Myrtus communis and Pistacia lentiscus. To do so, we collected open-pollinated progeny from selected maternal plants, calculated mating system parameters using microsatellite genotyping and conducted sowing experiments under greenhouse and field conditions. Our results showed that some progeny fitness components were negatively affected by the high correlated paternity of maternal plants. In Myrtus communis, high correlated paternity had a negative effect on the proportion and timing of seedling emergence in the natural field conditions and in the greenhouse sowing experiment, respectively. In Pistacia lentiscus, seedling emergence time under field conditions was also negatively influenced by high correlated paternity and a progeny survival analysis in the field experiment showed greater mortality of seedlings from maternal plants with high correlated paternity. Overall, we found effects of correlated paternity on the progeny performance of Myrtus communis, a self-compatible species. Further, we also detected effects of correlated paternity on the progeny emergence time and survival in Pistacia lentiscus, an obligate outcrossed species. This study represents one of the few existing empirical examples which highlight the influence that correlated paternity may exert on progeny performance in multiple stages during early seedling growth.
人为造成的栖息地退化会促使植物交配系统发生变化，进而可能影响后代的表现，从而决定下一代植物的补充更新情况。然而，除了异交率之外，很少有研究测试交配系统参数；而且母本植物所接受花粉的遗传多样性的直接影响（即相关父系）常常被忽视。在本研究中，我们调查了两种常见的地中海灌木——香桃木（Myrtus communis）和乳香黄连木（Pistacia lentiscus）中相关父系与后代表现之间的关系。为此，我们从选定的母本植物上收集了开放授粉的后代，使用微卫星基因分型计算交配系统参数，并在温室和田间条件下进行播种实验。我们的结果表明，母本植物的高相关父系对一些后代适合度成分有负面影响。在香桃木中，高相关父系分别对自然田间条件下和温室播种实验中的幼苗出土比例和时间有负面影响。在乳香黄连木中，田间条件下的幼苗出土时间也受到高相关父系的负面影响，并且田间实验中的后代存活分析表明，来自高相关父系母本植物的幼苗死亡率更高。总体而言，我们发现相关父系对自交亲和物种香桃木的后代表现有影响。此外，我们还检测到相关父系对专性异交物种乳香黄连木的后代出土时间和存活有影响。本研究是为数不多的现有实证例子之一，突出了相关父系在幼苗早期生长的多个阶段可能对后代表现产生的影响。
