A reconciliation analysis of host switching in plant-fungal symbioses
A reconciliation analysis of host switching in plant-fungal symbioses
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DOI：
10.1111/j.0014-3820.2004.tb00479.x
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发表时间：
2004-09-01
期刊：
影响因子：
3.3
通讯作者：
Jackson, AP
中科院分区：
文献类型：
--
作者：
Jackson, AP
植物-真菌共生包括许多熟悉的拮抗和互利关联以及一些共同进化的模型案例。不同进化尺度上的协同进化之间的关系仍然是一个悬而未决的问题。广泛的宿主特异性和记录的宿主转换为植物和真菌系统发育的比较提供了相互矛盾的指示。本研究试图通过比较 15 种植物-真菌共生体的树拓扑结构，确定植物系统发育在确定真菌系统发育中的作用以及共分化和宿主转换的相对贡献。其次，它试图描述系统发育一致性和转换之间的关系。根据已发表的序列估计树木，并以使用“丛林”的共系统发育图的形式应用协调分析。这提供了对能够协调两个相关系统发育的所有可能开关的详尽说明。共系统发育动态的连续体被确定，范围从主要是共分化（例如，Exobasidium）到主要是转换（例如，白粉菌）。令人惊讶的是，当使用共系统发育映射时，全等解不一定具有更少的开关，但全等与开关距离之间的显着负相关被证明是一个有用的指标。根据协调分析，宿主系统发育的贡献在植物-真菌共生体中差异很大，使得宿主特异性和共适应不能作为宏观进化趋势的指标，因为它们是必要的，但不是充分的条件。
Plant-fungal symbioses include many familiar antagonistic and mutualistic associations and some model cases of coevolution. The relationship between coevolution at the different evolutionary scales has remained an open question. Widespread host specificity and documented host switches offer conflicting indications of what to expect from comparisons of plant and fungal phylogenies. This study sought to establish the role of plant phylogeny in determining fungal phylogeny and the relative contributions of codivergence and host switching by comparing tree topologies for 15 plant-fungal symbioses. Second it attempted to characterize the relationship between phylogenetic congruence and switching. Trees were estimated from published sequences and reconciliation analysis was applied in the form of cophylogeny mapping using "jungles". This provided an exhaustive account of all possible switches capable of reconciling two associated phylogenies. A continuum of cophylogenetic dynamics was identified, ranging from mostly codivergence (e.g., Exobasidium) to mostly switching, (e.g., Erysiphe). Surprisingly, congruent solutions do not necessarily have fewer switches when using cophylogeny mapping, but a significant negative relationship between congruence and the distance of switches proved to be a useful indicator. According to reconciliation analysis, the contribution of host phylogeny varies widely across plant-fungal symbioses, making host specificity and coadaptation poor indicators of macroevolutionary trends because they are necessary, but not sufficient, conditions.