Stigma shape shifting in sages ( Salvia : Lamiaceae): hummingbirds guided the evolution of New World floral features

Stigma shape shifting in sages ( Salvia : Lamiaceae): hummingbirds guided the evolution of New World floral features
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圣人(鼠尾草:唇形科)的柱头形状变化:蜂鸟引导了新世界花卉特征的进化

DOI:
10.1093/botlinnean/boab096
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发表时间:
2021
影响因子:
2.4
通讯作者:
Sytsma, Kenneth J
Sytsma, Kenneth J
中科院分区:
生物学2区
文献类型:
--
作者:
Kriebel, Ricardo;Drew, Bryan T;González-Gallegos, Jesús G;Celep, Ferhat;Antar, Guilherme M;Pastore, José Floriano;Uría, Rolando;Sytsma, Kenneth J

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进化生物学的一个基本问题是生物体的进化枝是如何相互影响的。花的进化和随后的植物/传粉者的共同进化是新热带开花植物在不同分类水平上促进物种辐射的主要创新。本文验证了新热带特有蜂鸟的授粉驱动了新世界鼠尾草(Lamiaceae)两种独特柱头性状与其他花性状的进化。研究了400种丹参柱头分叶的形态特征。利用一套系统发育比较方法来检测形态变化、性状变化与BayesTraits的相关性和系统发育广义最小二乘回归,以及评分传粉媒介对性状进化的影响。我们发现,在早期转向蜂鸟授粉后,一个主要的新热带分支进化出了一组相关的柱头特征,包括柱头上部裂片更长和柱头刷。进化限制是显而易见的,因为后来蜜蜂授粉的转变在很大程度上保留了这两个特征。我们的研究结果支持了蜂鸟引导新热带鼠尾草花冠、花药连接、花柱和柱头形状的相关转变的假设,尽管蜜蜂授粉的反复转变。
A fundamental question in evolutionary biology is how clades of organisms exert influence on one another. The evolution of the flower and subsequent plant/pollinator coevolution are major innovations that have operated in flowering plants to promote species radiations at a variety of taxonomic levels in the Neotropics. Here we test the hypothesis that pollination by Neotropical endemic hummingbirds drove the evolution of two unique stigma traits in correlation with other floral traits in New WorldSalvia(Lamiaceae). We examined morphometric shapes of stigma lobing across 400Salviaspp., scored presence and absence of a stigma brush acrossSalvia, and used a suite of phylogenetic comparative methods to detect shape regime shifts, correlation of trait shifts with BayesTraits and phylogenetic generalized least square regressions, and the influence of scored pollinators on trait evolution using OUwie. We found that a major Neotropical clade ofSalviaevolved a correlated set of stigma features, with a longer upper stigma lobe and stigmatic brush, following an early shift to hummingbird pollination. Evolutionary constraint is evident as subsequent shifts to bee pollination largely retained these two features. Our results support the hypothesis that hummingbirds guided the correlative shifts in corolla, anther connective, style and stigma shape in NeotropicalSalvia, despite repeated shifts back to bee pollination.
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