Performance of generalist hemiparasitic Euphrasia across a phylogenetically diverse host spectrum

Performance of generalist hemiparasitic Euphrasia across a phylogenetically diverse host spectrum
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多面性半寄生幼鲃在系统发育多样化宿主谱中的表现

DOI:
10.1101/2021.03.25.436816
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发表时间:
2021
期刊:
--
影响因子:
--
通讯作者:
Brown M
Brown M
中科院分区:
--
文献类型:
--
作者:
Brown M

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泛生半寄生虫可以附着于许多不同的宿主物种,并经历复杂的寄生虫-宿主相互作用。这些寄生虫-宿主相互作用如何影响半寄生植物的适应性仍然很大程度上unknow.We实验使用易处理的eyebrights(小米草,列当科)了解寄生虫-宿主物种的相互作用影响的一个通才半寄生植物的性能。通过对45种不同寄主和不同寄生-寄主组合的实验研究表明,半寄生性的差异主要归因于寄主种类和寄主系统发育关系(λ= 0.82; 0.17-1.00 CI)。当性能的变化被认为是暂时的,一年生寄主物种导致开花早,并导致在本赛季后期较差的性能。WhileEuphrasiaspecies通常表现出类似的一个给定的主机species,一些eyeblihts显示更专门的寄生虫-host species interactions.Our结果表明,generalist hemiparasites只受益于附着到一个有限的,但在遗传上不同的,主机的子集。不同Euphrasiaspecies的保守反应表明半寄生虫的性能受到共同的主机属性。然而,更复杂的寄生虫-宿主物种的相互作用的证据表明,一个多面手半寄生虫可以潜在地响应个人的主机选择压力,并可能适应当地的主机社区。
Generalist hemiparasites may attach to many different host species and experience complex parasite–host interactions. How these parasite–host interactions impact on the fitness of hemiparasitic plants remain largely unknown.We used experimentally tractable eyebrights (Euphrasia, Orobanchaceae) to understand parasite–host species interactions affecting the performance of a generalist hemiparasitic plant. Common garden experiments were carried out measuringEuphrasiaperformance across 45 diverse hosts and in different parasite–host combinations.We show that variation in hemiparasite performance can be attributed mainly to host species and host phylogenetic relationships (λ= 0.82; 0.17–1.00 CI). When variation in performance is considered temporally, annual host species cause earlier flowering, and lead to poorer performance late in the season. WhileEuphrasiaspecies typically perform similarly on a given host species, some eyebrights show more specialized parasite–host species interactions.Our results show that generalist hemiparasites only benefit from attaching to a limited, but phylogenetically divergent, subset of hosts. The conserved responses of divergentEuphrasiaspecies suggest hemiparasite performance is affected by common host attributes. However, evidence for more complex parasite–host species interactions show that a generalist hemiparasite can potentially respond to individual host selection pressures and may adapt to local host communities.
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