Overcoming physical seed dormancy in priority native species for use in arid-zone restoration programs

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    Abstract

    © CSIRO 2016.The relative effectiveness of wet- and dry-heat treatments on alleviating physical dormancy (PY) of seeds of seven species of Fabaceae and five species of Malvaceae was determined to optimise seed handling procedures for ecological restoration. Seeds of all species were treated at different temperatures (40-100°C) for various durations (2 and 5min of wet heat, and 5, 10 and 30min of dry heat). Prior to treatment, seeds of all species exhibited low germination (0-38%). As hypothesised, there was variation among species with respect to the efficacy of the heat treatments. In general, wet-heat treatments at temperatures >70°C for 2 or 5min were effective in breaking PY for all Fabaceae species, and two Malvaceae species, with resultant germination typically >75%. For dry-heat treatments, higher temperatures and longer durations were required to achieve similar germination results. In the three Malvaceae species that were least responsive to heat (Abutilon otocarpum, Hibiscus haynaldii and Sida echinocarpa), there was a trade-off between treatment temperature and duration; lower temperatures (
    Original languageEnglish
    Pages (from-to)401-416
    Number of pages16
    JournalAustralian Journal of Botany
    Volume64
    Issue number5
    DOIs
    Publication statusPublished - 2016

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