Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China.
Graduate University of Chinese Academy of Sciences, Beijing 10049, China.
J Integr Plant Biol. 2017 Aug;59(8):526-530. doi: 10.1111/jipb.12546. Epub 2017 Jun 17.
Natural hybridization frequently occurs in plants and can facilitate gene flow between species, possibly resulting in species refusion. However, various reproductive barriers block the formation of hybrids and maintain species integrity. Here, we conducted a field survey to examine natural hybridization and reproductive isolation (RI) between sympatric populations of Primula secundiflora and P. poissonii using ten nuclear simple sequence repeat (SSR) loci. Although introgressive hybridization occurred, species boundaries between P. secundiflora and P. poissonii were maintained through nearly complete reproductive isolation. These interfertile species provide an excellent model for studying the RI mechanisms and evolutionary forces that maintain species boundaries.
自然杂交在植物中经常发生，可以促进物种之间的基因流动，可能导致物种融合。然而，各种生殖障碍阻止了杂种的形成并维持了物种的完整性。在这里，我们使用十个核简单序列重复（SSR）基因座，对同域分布的报春花属（Primula secundiflora）和 P. poissonii 之间的自然杂交和生殖隔离（RI）进行了实地调查。尽管发生了渐渗杂交，但 P. secundiflora 和 P. poissonii 之间的物种边界仍然通过近乎完全的生殖隔离来维持。这些可杂交的物种为研究维持物种边界的 RI 机制和进化力量提供了一个极好的模型。
