Reproductive biology and genetic population structure of two alien Lolium species inhabiting the sandy coasts of Japan
Reproductive biology and genetic population structure of two alien Lolium species inhabiting the sandy coasts of Japan
复制标题
栖息在日本沙质海岸的两种外来黑麦草物种的生殖生物学和遗传种群结构
DOI：
10.1111/1442-1984.12235
复制
发表时间：
2019
影响因子：
1.4
通讯作者：
Tohru Tominaga
中科院分区：
文献类型：
--
作者：
Yumiko Higuchi;Yoshiko Shimono;Tohru Tominaga
了解外来物种的特性是任何生物学研究或反入侵管理策略的先决条件。硬直黑麦草（禾本科）是日本桑迪海岸归化的外来物种;然而，它表现出广泛的形态变异，导致人们猜测，几个分类群的黑麦草已经归化。在这里，我们比较了形态，生殖生物学和遗传结构的thisLolium物种，从不同地点在同一环境中生长的个人，以澄清所观察到的形态变化是基于遗传还是种内变异所造成的环境差异。对11个形态性状进行主成分分析，可将其分为两类。套袋实验表明，一种类型表现出异交生活史，而另一种类型只自交。核DNA微卫星分析支持这两种形态类型之间的区别，没有发现中间个体。异交型表现出较高的遗传多样性，而自交型几乎没有表现出多态性，反映了它们的育种系统的差异。此外，这两种类型不同于经济上重要的异交种多花黑麦草和多年生黑麦草。这两种类型的Lolium预计有不同的引进历史和入侵潜力的日本海岸。总之，重要的是通过额外的生物学研究来区分这些类型，以设计有效的控制措施。
Understanding the characteristics of alien species is a prerequisite for any biological study or anti‐invasion management strategy.Lolium rigidum(Poaceae) is an alien species that has become naturalized on the sandy coasts of Japan; however, it exhibits extensive morphological variation, leading to speculation that several taxa ofLoliumhave become naturalized. Here, we compared the morphology, reproductive biology and genetic structure of thisLoliumspecies by growing individuals from different locations in the same environment to clarify whether the observed morphological variation is genetically based or is caused by intraspecific variation as a result of environmental differences. Principle component analyses of 11 morphological traits separated the study species into two types. Bagging experiments showed that one type exhibited an outcrossing life history, whereas the other type selfed exclusively. Nuclear DNA microsatellite analyses supported this distinction between these morphological types, with no intermediate individuals being found. The outcrossing type exhibited high genetic diversity, whereas the selfing type exhibited almost no polymorphism, reflecting the differences in their breeding systems. Moreover, both types differed from the economically important outcrossing speciesLolium multiflorumandLolium perenne. These two types ofLoliumare expected to have different introduction histories and invasive potential on the coasts of Japan. In conclusion, it is important to distinguish between these types through additional biological studies to design effective control measures.