Maternal effects and ecological divergence in aquatic plants: a case study in natural reciprocal hybrids between Potamogeton perfoliatus and P. wrightii
Maternal effects and ecological divergence in aquatic plants: a case study in natural reciprocal hybrids between Potamogeton perfoliatus and P. wrightii
复制标题
DOI：
10.1111/1442-1984.12006
复制
发表时间：
2013-01-01
影响因子：
1.4
通讯作者：
Kosuge, Keiko
中科院分区：
文献类型：
--
作者：
Iida, Satoko;Kadono, Yasuro;Kosuge, Keiko
当亲本类群适应不同的生境时，杂交基因型往往是高度异质性的，因此生境或生态因素影响杂交的命运和生态表现。杂交种的性状表达并不总是介于双亲之间，而是可能是亲本般的或极端的(超亲)，这取决于表型的遗传控制。细胞质和核基因组的种间互作所产生的母体效应在天然杂交种的性状表达中起着重要作用。这种相互作用往往会导致杂交不育或不能存活。然而，当杂交种存活时，细胞核相互作用可能通过影响性状表达来促进杂交种的持久性。到目前为止，母体对杂交性能的影响主要是在实验生产的杂交种或由于难以获得物种特有的分子标记而没有确定交叉方向的自然杂交种中进行的。在水生植物中，许多杂交种通过广泛的克隆生长得以持续，是水生群落的重要组成部分。许多这样的杂交种在水生植物最大的属--水生水生藻类中已知。由于眼子菜物种在生态上具有高度的多样性，而且母系血统很容易用分子标记来区分，因此眼子菜的天然杂交非常适合于母体效应的研究，特别是那些影响营养性能的研究。作为一个案例研究，我们集中在母体效应的耐旱性和深度分布的自然杂交鳗鱼起源于密切相关的物种。
When parental taxa are adapted to different habitats, hybrid genotypes are often highly heterogeneous, such that habitat or ecological factors influence hybrid fate and ecological performance. Trait expression in hybrids is not always intermediate between the parents, but may instead be either parental-like or extreme (transgressive) depending on genetic control of the phenotypes. Maternal effects arising from interspecific interaction between cytoplasmic and nuclear genomes are widely recognized as playing a role in character expression of natural hybrids. Such interaction often leads to hybrid sterility or inviability. When hybrids are viable, however, cytonuclear interaction may contribute to hybrid persistence through its influence on trait expression. To date, maternal influence on hybrid performance has been examined primarily in experimentally produced hybrids, or in natural hybrids without identification of the cross direction owing to difficulty in obtaining species-specific molecular markers. In aquatic plants, many hybrids persist by extensive clonal growth and are important components of aquatic communities. Many such hybrids are known in Potamogeton (pondweeds), the largest aquatic genus. Because Potamogeton species are ecologically highly diverse and maternal lineages are readily distinguished using molecular markers, natural hybrids of Potamogeton are well-suited for studies of maternal effects, especially those affecting vegetative performance. As a case study, we have focused on maternal effects on drought tolerance and depth distribution in the natural hybrid P. x anguillanus derived from the closely related species P. perfoliatus and P. wrightii.