Orchis Militaris L.

Farrell, Lynne

doi:10.2307/2260166

Cited by 31 publications

(4 citation statements)

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“…Because O. purpurea and O. militaris are pollinated by the same suite of generalist pollinators (mostly bees, bumblebees, and flies) [18,19] and display considerable overlap in flowering time, frequent exchange of pollen between the parental species is likely. Moreover, experimental pollinations between O. purpurea and O. militaris also showed that both species are capable of producing high levels (> 90%) of fruit set when they are pollinated with pollen of the other species [15].…”

Section: Discussionmentioning

confidence: 99%

“…O. purpurea has a predominantly Mediterranean distribution [25], although some isolated populations can be found in the UK, Belgium and The Netherlands, where the species reaches the northern border of its distribution range. O. militaris , on the other hand, shows a more continental distribution, occurring from the Atlantic Coast as far east as Mongolia [18]. The two species have slightly different habitat preferences.…”

Section: Methodsmentioning

confidence: 99%

“…O. purpurea and O. militaris are both food deceptive species and pollinated by generalist pollinators, most often bumblebees or bees, but small flies and butterflies have also been reported visiting the flowers of both species [15,18]. The species display considerable overlap in flowering time: whereas flowering in O. purpurea starts at the beginning of May and lasts until the beginning of June [25], O. militaris usually starts flowering two weeks later (mid-May) and flowering lasts until mid June [18].…”

Section: Methodsmentioning

confidence: 99%

“…The species display considerable overlap in flowering time: whereas flowering in O. purpurea starts at the beginning of May and lasts until the beginning of June [25], O. militaris usually starts flowering two weeks later (mid-May) and flowering lasts until mid June [18]. Flowers are conspicuously purple and show little variation in O. militaris , whereas in O. purpurea the flowers can display considerable variation, particularly in the shape and colour of the labellum and the helmet.…”

Section: Methodsmentioning

confidence: 99%

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Asymmetric gene introgression in two closely related Orchis species: evidence from morphometric and genetic analyses

et al. 2012

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BackgroundIn food-deceptive orchids of the genera Anacamptis, Neotinea and Orchis floral isolation has been shown to be weak, whereas late-acting reproductive barriers are mostly strong, often restricting hybridization to the F1 generation. Only in a few species hybridization extends beyond the F1 generation, giving rise to hybrid swarms. However, little is known about the abundance of later-generation hybrids and what factors drive their occurrence in hybrid populations. In this study, molecular analyses were combined with detailed morphological measurements in a hybrid population of two closely related Orchis species (Orchis militaris and O. purpurea) to investigate the hypothesis that the abundance of later-generation hybrids is driven by changes in floral characters after hybridization that exert selective pressures that in turn affect hybridization.ResultsBoth the molecular and morphological data point to extensive genetic and morphological homogenization and asymmetric introgression. Estimating genomic clines from the multi-locus genotype data and testing for deviation from neutrality revealed that 30 out of 113 (27%) AFLP markers significantly deviated from neutral expectations. Plants with large floral displays or plant with flowers that resembled more O. purpurea had higher female fitness than plants with small floral displays or plants with flowers resembling more O. militaris, suggesting that directional selection may have contributed to the observed patterns of introgression.ConclusionsThese results indicate that in closely related orchid species hybridization and gene introgression may be partly driven by selection for floral traits of one of the parental types. However, because some pure individuals were still present in the studied population, the parental species appeared to be sufficiently isolated to survive the challenge of sympatry.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Asymmetric gene introgression in two closely related Orchis species: evidence from morphometric and genetic analyses

et al. 2012

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Microsatellites and petal morphology reveal new patterns of admixture in Orchis hybrid zones

Bersweden

Viruel

Schatz

et al. 2021

American J of Botany

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The genetic structure of hybrid zones provides insight into the potential for gene flow to occur between plant taxa. Four closely related European orchid species (Orchis anthropophora, O. militaris, O. purpurea, and O. simia) hybridize when they co-occur. We aimed to characterize patterns of hybridization in O. militaris-O. purpurea, O. purpurea-O. simia, and O. anthropophora-O. simia hybrid zones using molecular and morphological data. Methods: We used 11 newly isolated nuclear microsatellites to genotype 695 individuals collected from seven hybrid zones and six allopatric parental populations in France. Geometric morphometric analysis was conducted using 15 labellum landmarks to capture the main aspects of petal shape. Results: Backcrossing was asymmetric toward O. militaris in multiple O. militaris-O. purpurea hybrid zones. Hybrids in O. purpurea-O. simia and O. anthropophora- O. simia hybrid zones were largely limited to F1 and F2 generations, but further admixture had occurred. These patterns were reflected in labellum geometric morphometric data, which correlated strongly with nuclear microsatellite data in all three species combinations. Conclusions: The coexistence of parental and admixed individuals in these Orchis hybrid zones implies they are likely to be tension zones being maintained by a balance between gene flow into the hybrid zone and selection acting against admixed individuals. The pattern of admixture in the three species combinations suggests intrinsic selection acting on the hybrids is weaker in more closely related taxa.

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The Role of Ecological Factors in Distribution and Abundance of Terrestrial Orchids

Djordjević

Tsiftsis

2019

Reference Series in Phytochemistry

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Orchis Militaris L.

Cited by 31 publications

References 0 publications

Asymmetric gene introgression in two closely related Orchis species: evidence from morphometric and genetic analyses

Asymmetric gene introgression in two closely related Orchis species: evidence from morphometric and genetic analyses

Microsatellites and petal morphology reveal new patterns of admixture in Orchis hybrid zones

The Role of Ecological Factors in Distribution and Abundance of Terrestrial Orchids

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