Morphological and molecular evidence for hybridization and introgression in Central European Arctium (Asteraceae)

Repplinger, Miriam; Johannesen, Jes; Seitz, Alfred; Comes, Hans Peter

doi:10.1007/s00606-007-0547-9

Cited by 7 publications

(3 citation statements)

References 52 publications

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“…Only when R. angustifolius was very rare (Jardin Massart in 2002) a negative mean hybrid index was found. The positive relationship between R. angustifolius frequency and mean hybrid index confirms the strong effect that species frequencies can have on hybrid formation (Burgess et al 2005;Repplinger et al 2007;Lepais et al 2009). However, the fact that the index already became positive when R. angustifolius was still in the minority indicates that factors other than numerical presence play an important role as well.…”

Section: Hybrid Indexsupporting

confidence: 72%

Hybridization in Annual Plants: Patterns and DynamicsDuring a Four-Year Study in Mixed Rhinanthus Populations

2010

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Hybridization in annual plants is rare, but their short life cycle provides an excellent opportunity to study the dynamics of hybridization. Hybridization occurs between the annual hemiparasites Rhinanthus minor and Rhinanthus angustifolius (Orobanchaceae). Using flower morphology, Kwak (1980) found a prevalence of hybrids close to R. angustifolius in a single population. We aim to find whether this pattern is also found using genetic markers, whether it is generally occurring in mixed populations, and whether these populations are stable over time. We used species-specific genetic markers to determine the number of individuals in a range of hybrid classes in three mixed populations of different ages during four consecutive years. In the young population, F 1 hybrids were found in the first year and mostly hybrids between R. minor and these F 1 s in the second year, but in the years after that, hybrids close to R. angustifolius became more abundant. We also found this in the two older populations, where hybrids close to R. angustifolius always occurred in higher frequencies than hybrids close to R. minor. Over time, R. angustifolius strongly increased in frequency in two populations. Patterns of marker presence and absence suggested that advanced-generation hybrids are mainly formed by backcrossing with one of the parents, predominantly R. angustifolius whenever its frequency in the population is higher than 15%. The dynamics of mixed populations depend on the ecological conditions that regulate the presence of the two parental species, and introgression into R. angustifolius seems prevalent.

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Section: Hybrid Indexsupporting

confidence: 72%

Hybridization in Annual Plants: Patterns and DynamicsDuring a Four-Year Study in Mixed Rhinanthus Populations

2010

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“…Similar cases of human-induced changes that lead to secondary contact of previously separated species, promoting their hybridization, have been documented, for example, in Prunus fruticosa vs. P. cerasus [105] , Viola lutea subsp. sudetica vs. V. tricolor [4] , Senecio hercynicus vs. S. ovatus [48] , Arctium lappa vs. A. tomentosum vs. A. minus [49] .…”

Section: Discussionmentioning

confidence: 99%

“…Various methodological approaches are available for studying introgressive hybridization (morphometrics, karyology, allozymes, microsatellites [1] , [4] , [46] – [49] . Flow cytometry represents a rather dated but still very efficient tool for the study of hybridization (including introgression), as it allows for rapid estimation of nuclear DNA content of large numbers of individuals [50] .…”

Section: Introductionmentioning

confidence: 99%

Continuous Morphological Variation Correlated with Genome Size Indicates Frequent Introgressive Hybridization among Diphasiastrum Species (Lycopodiaceae) in Central Europe

et al. 2014

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Introgressive hybridization is an important evolutionary process frequently contributing to diversification and speciation of angiosperms. Its extent in other groups of land plants has only rarely been studied, however. We therefore examined the levels of introgression in the genus Diphasiastrum, a taxonomically challenging group of Lycopodiophytes, using flow cytometry and numerical and geometric morphometric analyses. Patterns of morphological and cytological variation were evaluated in an extensive dataset of 561 individuals from 57 populations of six taxa from Central Europe, the region with the largest known taxonomic complexity. In addition, genome size values of 63 individuals from Northern Europe were acquired for comparative purposes. Within Central European populations, we detected a continuous pattern in both morphological variation and genome size (strongly correlated together) suggesting extensive levels of interspecific gene flow within this region, including several large hybrid swarm populations. The secondary character of habitats of Central European hybrid swarm populations suggests that man-made landscape changes might have enhanced unnatural contact of species, resulting in extensive hybridization within this area. On the contrary, a distinct pattern of genome size variation among individuals from other parts of Europe indicates that pure populations prevail outside Central Europe. All in all, introgressive hybridization among Diphasiastrum species in Central Europe represents a unique case of extensive interspecific gene flow among spore producing vascular plants that cause serious complications of taxa delimitation.

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Qualitative and quantitative analysis of arctiin and arctigenin in Arctium tomentosum Mill. by high-performance thin-layer chromatography

Liu

et al. 2020

JPC-J Planar Chromat

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Morphological and molecular evidence for hybridization and introgression in Central European Arctium (Asteraceae)

Cited by 7 publications

References 52 publications

Hybridization in Annual Plants: Patterns and DynamicsDuring a Four-Year Study in Mixed Rhinanthus Populations

Hybridization in Annual Plants: Patterns and DynamicsDuring a Four-Year Study in Mixed Rhinanthus Populations

Continuous Morphological Variation Correlated with Genome Size Indicates Frequent Introgressive Hybridization among Diphasiastrum Species (Lycopodiaceae) in Central Europe

Qualitative and quantitative analysis of arctiin and arctigenin in Arctium tomentosum Mill. by high-performance thin-layer chromatography

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