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  • Wiley  (3)
  • Koch, Marcus A.  (3)
  • 1
    In: Ecology and Evolution, Wiley, Vol. 5, No. 8 ( 2015-04), p. 1734-1745
    Abstract: Reciprocal crosses between species often display an asymmetry in the fitness of F 1 hybrids. This pattern, referred to as isolation asymmetry or Darwin's corollary to Haldane's rule, is a general feature of reproductive isolation in plants, yet factors determining its magnitude and direction remain unclear. We evaluated reciprocal species crosses between two naturally hybridizing diploid species of A rabidopsis to assess the degree of isolation asymmetry at different postmating life stages. We found that pollen from A rabidopsis arenosa will usually fertilize ovules from Arabidopsis lyrata ; the reverse receptivity being less complete. Maternal A . lyrata parents set more F 1 hybrid seed, but germinate at lower frequency, reversing the asymmetry. As predicted by theory, A . lyrata (the maternal parent with lower seed viability in crosses) exhibited accelerated chloroplast evolution, indicating that cytonuclear incompatibilities may play a role in reproductive isolation. However, this direction of asymmetrical reproductive isolation is not replicated in natural suture zones, where delayed hybrid breakdown of fertility at later developmental stages, or later‐acting selection against A . arenosa maternal hybrids (unrelated to hybrid fertility, e.g., substrate adaptation) may be responsible for an excess of A . lyrata maternal hybrids. Exogenous selection rather than cytonuclear incompatibilities thus shapes the asymmetrical postmating isolation in nature.
    Type of Medium: Online Resource
    ISSN: 2045-7758 , 2045-7758
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 2635675-2
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  • 2
    Online Resource
    Online Resource
    Wiley ; 2008
    In:  TAXON Vol. 57, No. 3 ( 2008-08), p. 933-
    In: TAXON, Wiley, Vol. 57, No. 3 ( 2008-08), p. 933-
    Abstract: Since the introduction of Arabidopsis thaliana , the Thale Cress, to a broader scientific community in 1965, nearly 40 years passed until the phylogenetic position of this species was resolved and its closest relatives were characterized. More and more molecular data is available for Arabidopsis thaliana and it has become the most important model system among dicotyledonous plants. However, Arabidopsis thaliana provides only a limited set of traits and characters. We are now in the position that scientists move into the more diverse relatives of Arabidopsis , transferring knowledge from the model plant to these species. Hereby past taxonomy and phylogenetic concepts may lead to misunderstanding and confusion. Consequently there is much need to provide a comprehensive overview on current knowledge of systematics, evolution and diversity of Arabidopsis and its relatives, despite the several actual reviews focusing on various aspects of its taxonomy, ecology, and importance as model system considering also the closest wild relatives. Herein, we aim to critically discuss the most recent taxonomic and systematic conclusions in the light of a worldwide screening of genetic diversity within the genus Arabidopsis . We also define gaps of knowledge to focus and stimulate future research activities.
    Type of Medium: Online Resource
    ISSN: 0040-0262 , 1996-8175
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2008
    detail.hit.zdb_id: 2081189-5
    detail.hit.zdb_id: 204216-2
    SSG: 12
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  • 3
    In: TAXON, Wiley, Vol. 61, No. 5 ( 2012-10), p. 1001-1009
    Abstract: We are developing an online­accessible knowledge and database system of cross­referenced information and resources on Brassicaceae (Cruciferae) taxonomy, systematics and evolution, including chromosome numbers, traits and characters, germplasm resources, and accurate enumeration of all species, genera and tribes. Biological, molecular and evolutionary knowledge is exponentially increasing in the mustard family. However, because of the complex and overwhelming biological diversity of the family, it is difficult to assess research results within a larger evolutionary framework. Many species have proven to be remarkable study objects but are rarely available. Biological material and resources, either collected directly in the wild or held in germplasm collections, have often been taxonomically misidentified; and only very rarely has the material been further characterized and documented. There is also no comprehensive survey of character and trait distribution among Brassicaceae lineages, though family­wide phylogenies are meanwhile available. In order to close these gaps, we will make accessible to the scientific community the research data focusing on adaptive characters and their evolution in the Brassicaceae. In this context, we will also provide a comprehensive documentation of the taxonomy and systematics of the entire family. This will include a database with all relevant taxonomic, systematic and phylogenetic literature, a comprehensive data collection of characters and traits, a DNA­based identification tool for genera and species, electronic interactive keys for the identification of genera and species, and a setup of a carefully selected and documented germplasm collection representing main lineages of the family. This knowledge database, hereafter BrassiBase , has been launched within the framework of the DFG priority programme SSP 1529 “Adaptomics – Evolutionary plant solutions to ecological challenges/Molecular mechanisms underlying adaptive traits in the Brassicaceae s.l.”
    Type of Medium: Online Resource
    ISSN: 0040-0262 , 1996-8175
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2012
    detail.hit.zdb_id: 2081189-5
    detail.hit.zdb_id: 204216-2
    SSG: 12
    Location Call Number Limitation Availability
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