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    Directional selection for flowering time leads to adaptive evolution in Raphanus raphanistrum (Wild radish)

    238951_238951.pdf (285.7Kb)
    Access Status
    Open access
    Authors
    Ashworth, Michael
    Walsh, M.
    Flower, K.
    Vila-Aiub, M.
    Powles, S.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Ashworth, M. and Walsh, M. and Flower, K. and Vila-Aiub, M. and Powles, S. 2016. Directional selection for flowering time leads to adaptive evolution in Raphanus raphanistrum (Wild radish). Evolutionary Applications. 9 (4): pp. 619-629.
    Source Title
    Evolutionary Applications
    DOI
    10.1111/eva.12350
    ISSN
    1752-4563
    School
    Centre for Crop Disease Management
    Remarks

    This open access article is distributed under the Creative Commons license http://creativecommons.org/licenses/by/4.0/

    URI
    http://hdl.handle.net/20.500.11937/40086
    Collection
    • Curtin Research Publications
    Abstract

    © 2015 The Authors. Herbicides have been the primary tool for controlling large populations of yield depleting weeds from agro-ecosystems, resulting in the evolution of widespread herbicide resistance. In response, nonherbicidal techniques have been developed which intercept weed seeds at harvest before they enter the soil seed bank. However, the efficiency of these techniques allows an intense selection for any trait that enables weeds to evade collection, with early-flowering ecotypes considered likely to result in early seed shedding. Using a field-collected wild radish population, five recurrent generations were selected for early maturity and three generations for late maturity. Phenology associated with flowering time and growth traits were measured. Our results demonstrate the adaptive capacity of wild radish to halve its time to flowering following five generations of early-flowering selection. Early-maturing phenotypes had reduced height and biomass at maturity, leading to less competitive, more prostrate growth forms. Following three generations of late-flowering selection, wild radish doubled its time to flowering time leading to increased biomass and flowering height at maturity. This study demonstrates the potential for the rapid evolution in growth traits in response to highly effective seed collection techniques that imposed a selection on weed populations within agro-ecosystems at harvest.

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