Reticulate Evolution Helps Explain Apparent Homoplasy in Floral Biology and Pollination in Baobabs (Adansonia; Bombacoideae; Malvaceae)
Reticulate Evolution Helps Explain Apparent Homoplasy in Floral Biology and Pollination in Baobabs (Adansonia; Bombacoideae; Malvaceae)
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DOI：
10.1093/sysbio/syz073
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发表时间：
2020-05-01
影响因子：
6.5
通讯作者：
Baum, David A.
中科院分区：
文献类型：
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作者：
Karimi, Nisa;Grover, Corrinne E.;Baum, David A.
猴面包树（猴面包树）是一种紧密结合的热带乔木，分布在澳大利亚、马达加斯加和非洲大陆，有多种不同的花，有两种授粉模式。我们使用定制目标序列捕获结合新的和现有的系统发育比较方法来探索花性状和传粉系统的进化，同时允许网状进化。我们的分析表明，Adansonia的关系被网络混淆，网络推理方法支持至少一个网络事件。最受支持的假设包括adanonia rubrostipa和core经线科植物之间的基因渗入，两者都是用黄色/红色花朵授粉的鹰蛾，但也有一些支持非洲谱系和马达加斯加短叶科植物之间的基因渗入，两者都是用白色花朵哺乳动物授粉。提出了一种新的系统发育网络比较方法，该方法允许对祖先状态进行最大似然推断，并应用于研究花生物学上的明显同型性和Adansonia的授粉模式。这一分析支持了渐渗杂交在形态进化中的作用，即使在具有高度分化和地理上广泛分布的物种的进化枝中也是如此。我们在PhyloNetworks软件中实现了物种网络上离散特征的新比较方法。
Baobabs (Adansonia) are a cohesive group of tropical trees with a disjunct distribution in Australia, Madagascar, and continental Africa, and diverse flowers associated with two pollination modes. We used custom-targeted sequence capture in conjunction with new and existing phylogenetic comparative methods to explore the evolution of floral traits and pollination systems while allowing for reticulate evolution. Our analyses suggest that relationships in Adansonia are confounded by reticulation, with network inference methods supporting at least one reticulation event. The best supported hypothesis involves introgression between Adansonia rubrostipa and core Longitubae, both of which are hawkmoth pollinated with yellow/red flowers, but there is also some support for introgression between the African lineage and Malagasy Brevitubae, which are both mammal-pollinated with white flowers. New comparative methods for phylogenetic networks were developed that allow maximum-likelihood inference of ancestral states and were applied to study the apparent homoplasy in floral biology and pollination mode seen in Adansonia. This analysis supports a role for introgressive hybridization in morphological evolution even in a clade with highly divergent and geographically widespread species. Our new comparative methods for discrete traits on species networks are implemented in the software PhyloNetworks.