Testing for Hybridization between Centaurea stoebe and Centaurea jacea (Asteraceae) in the Isolated Island Setting of Nantucket, Massachusetts, U.S.A.

Pub Date : 2022-09-15 DOI:10.3119/20-19
Tomáš Závada, K. Omand, Rondy J. Malik, Dina Tsirelson, R. Kesseli
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Abstract

ABSTRACT Spotted knapweed (Centaurea stoebe) and brown knapweed (Centaurea jacea) are members of the Asteraceae and natives of Eurasia. Centaurea stoebe is a major invasive species in North America, dominating large stretches of grassland. It also is known to form hybrids in North America with closely related naturalized Centaurea spp., including C. jacea. Both species were introduced on Nantucket Island, a coastal island 44 km south of Cape Cod, Massachusetts, and morphologically unusual, possible hybrid populations have been reported. The aim of this study was to test for hybridization between these weeds in an isolated setting. Chloroplast marker sequences revealed that all the hybrid-like plants shared the same haplotype with C. jacea populations. The analysis of nuclear markers with microsatellite markers showed surprisingly little intra- and inter-specific gene flow between populations and no evidence of hybridization between C. stoebe and C. jacea. Two populations with hybrid-like morphology are most likely environmental plastic morphs of C. jacea.
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在美国马萨诸塞州楠塔基特的孤立岛屿环境中,矢车菊和矢车菊(菊科)杂交的试验。
斑点牛蒡(Centaurea stoebe)和棕色牛蒡是菊科的成员,原产于欧亚大陆。白头翁是北美的主要入侵物种,在大片草原上占主导地位。众所周知,它在北美洲与亲缘关系密切的归化Centaurea spp.形成杂交种,包括C.jacea。这两个物种都是在马萨诸塞州科德角以南44公里的沿海岛屿楠塔基特岛引进的,据报道,在形态上不寻常,可能是杂交种群。本研究的目的是在一个孤立的环境中测试这些杂草之间的杂交。叶绿体标记序列显示,所有类似杂交的植物与C.jacea种群共享相同的单倍型。用微卫星标记对核标记的分析显示,种群之间的特异性和特异性基因流惊人地少,并且没有证据表明白鼬和魔芋之间存在杂交。两个具有类杂交形态的种群最有可能是魔芋的环境塑性形态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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