Different Geographical Distributions of Two Chemotypes of Barbarea vulgaris that Differ in Resistance to Insects and a Pathogen

@article{Christensen2014DifferentGD,
  title={Different Geographical Distributions of Two Chemotypes of Barbarea vulgaris that Differ in Resistance to Insects and a Pathogen},
  author={Stina Christensen and Christine Heimes and Niels Agerbirk and Vera Kuzina and Carl Erik Olsen and Thure Pavlo Hauser},
  journal={Journal of Chemical Ecology},
  year={2014},
  volume={40},
  pages={491-501}
}
The interactions of plants with herbivores and pathogens have been suggested to drive the evolution of resistances in plants and in some cases new lineages and taxa. However, such divergence may require reproductive isolation, e.g., in allopatry. In the crucifer Barbarea vulgaris, some plants are resistant to the flea beetle Phyllotreta nemorum, due to production of specific saponins, whereas others are susceptible. Resistant and susceptible plants additionally differ in resistance to the… 
Ecotypic differentiation of two sympatric chemotypes of Barbarea vulgaris (Brassicaceae) with different biotic resistances
TLDR
The two chemotypes of B. vulgaris are adapted to different habitats to some extent, which could contribute to maintain their differentiation in sympatry.
A hybridisation barrier between two evolutionary lineages of Barbarea vulgaris (Brassicaceae) that differ in biotic resistances
TLDR
The two B. vulgaris types have not merged in sympatry and why genes for insect-resistance have not introgressed to any extent from one to the other, which may explain why the two plant types are separated.
Effects of a saponin-based insect resistance and a systemic pathogen resistance on field performance of the wild crucifer Barbarea vulgaris
TLDR
In contrast to the Albugo resistance, which clearly benefited the plants, the results show that the saponin-based insect resistance did convey any benefit under the given conditions despite its deterrent effects in controlled experiments.
Interactive impacts of a herbivore and a pathogen on two resistance types of Barbarea vulgaris (Brassicaceae)
TLDR
Interactive impacts of the herbivore and pathogen differed between the two resistance types, with an antagonistic combined impact in G-plants, which lasted surprisingly long, and a slight synergistic impact in P-plans.
Different herbivore responses to two co-occurring chemotypes of the wild crucifer Barbarea vulgaris
TLDR
Overall, the defences of the P-type against herbivores seem not to be as effective as those of the G-type, which is surprising given its large geographical distribution, overlapping with that of theG-type in Scandinavia and Finland, suggesting that additional ecological interactions determine the success of the two chemotypes.
Interactions of Bunias orientalis plant chemotypes and fungal pathogens with different host specificity in vivo and in vitro
TLDR
It is found that the specialist, but not the generalist, was sensitive to differences between plant chemotypes in vivo and in vitro, underlines the necessity to combine various experimental approaches to elucidate the complex interplay between plants and different pathogens.
The genome sequence of Barbarea vulgaris facilitates the study of ecological biochemistry
TLDR
The Barbarea genus Barbarea has emerged as a model for evolution and ecology of plant defense compounds, due to its unusual glucosinolate profile and production of saponins, unique to the Brassicaceae, and a draft genome sequence of the G-type, and re-sequencing of the P-type is reported.
Adaptation of flea beetles to Brassicaceae: host plant associations and geographic distribution of Psylliodes Latreille and Phyllotreta Chevrolat (Coleoptera, Chrysomelidae)
TLDR
It is postulate that Phyllotreta and Psylliodes colonised Brassicaceae independently from each other.
Identification and genome organization of saponin pathway genes from a wild crucifer, and their use for transient production of saponins in Nicotiana benthamiana.
TLDR
It is argued that saponin biosynthesis in the Barbarea genus evolved by a neofunctionalized glucosyl transferase, whereas the difference between resistant and susceptible B. vulgaris chemotypes evolved by different expression of oxidosqualene cyclases (OSCs).
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