Digitized collections elucidate invasion history and patterns of awn polymorphism in Microstegium vimineum.
Digitized collections elucidate invasion history and patterns of awn polymorphism in Microstegium vimineum.
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DOI：
10.1002/ajb2.1852
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发表时间：
2022-05
影响因子：
3
通讯作者：
Cumberledge, Aubrey N.
中科院分区：
文献类型：
--
作者：
Barrett, Craig F.;Huebner, Cynthia D.;Bender, Zoe A.;Budinsky, Trezalka A.;Corbett, Cameron W.;Latvis, Maribeth;McKain, Michael R.;Motley, M'Kayla;Skibicki, Samuel V.;Thixton, Hana L.;Santee, Mathilda V.;Cumberledge, Aubrey N.
关键词：
数字化收集可以帮助阐明入侵植物建立和传播背后的机制。这些数据库提供了在空间和时间上的特征记录，允许调查影响入侵物种的非生物和生物因素。研究了1100多份数字化标本记录，以调查竹秆草的入侵历史和性状变异。芒的存在和不存在进行了调查，以量化的地理格局，这种多态性的特点，这在禾本科植物中有几个功能，包括硬骨瘤埋葬和传播到发芽地点。进一步量化了小花性状，并对当代样品进行了基因组分析，以调查M。vimineum的引进和传播到北美。植物标本记录显示，在原生地和入侵地的芒的多态性相似的模式。vimineum，具芒的形式在高纬度占主导地位，无芒的形式在低纬度。植物标本记录和基因组数据表明，无芒的形式最初在美国东南部的引进和传播，其次是一个假定的二次入侵和传播的有芒的形式从宾夕法尼亚州东部。有芒的形式有较长的小花，并且小花大小随纬度显著变化。有证据表明，在中纬度地区有一个过渡区，有短芒标本。基因组分析揭示了两个不同的集群对应无芒和芒的形式，与混合物的证据。我们的研究结果表明，植物标本数据的力量，以阐明在北美的一个有问题的杂草的入侵历史，并与基因组数据一起，揭示了一个可能的关键性状在引进成功：存在或不存在的芒。
Digitized collections can help illuminate the mechanisms behind the establishment and spread of invasive plants. These databases provide a record of traits in space and time that allows for investigation of abiotic and biotic factors that influence invasive species. Over 1100 digitized herbarium records were examined to investigate the invasion history and trait variation of Microstegium vimineum. Presence–absence of awns was investigated to quantify geographic patterns of this polymorphic trait, which serves several functions in grasses, including diaspore burial and dispersal to germination sites. Floret traits were further quantified, and genomic analyses of contemporary samples were conducted to investigate the history of M. vimineum's introduction and spread into North America. Herbarium records revealed similar patterns of awn polymorphism in native and invaded ranges of M. vimineum, with awned forms predominating at higher latitudes and awnless forms at lower latitudes. Herbarium records and genomic data suggested initial introduction and spread of the awnless form in the southeastern United States, followed by a putative secondary invasion and spread of the awned form from eastern Pennsylvania. Awned forms have longer florets, and floret size varies significantly with latitude. There is evidence of a transition zone with short‐awned specimens at mid‐latitudes. Genomic analyses revealed two distinct clusters corresponding to awnless and awned forms, with evidence of admixture. Our results demonstrate the power of herbarium data to elucidate the invasion history of a problematic weed in North America and, together with genomic data, reveal a possible key trait in introduction success: presence or absence of an awn.
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