Physical dormancy in seeds of Androcalva perlaria (Malvaceae): a critically endangered species from the south-west of western Australia

摘要

Androcalva perlaria C. F. Wilkins is a critically threatened species occurring in just four isolated wetlands in the south-west of western Australia with less than 100 known plants remaining in the wild (Nikabadi ef al 2010). Understanding seed ecology is of particular importance given the influence of seed dormancy and germination on the recruitment of new seedlings, and the role that a persistent soil seed bank can play in the long-term viability of plant populations (Cochrane ef al 2007). This study set out to develop a detailed understanding of the seed ecology of this species to aid present and future recovery programs. It identified key seed traits including type of seed dormancy, optimal incubation conditions, the effects of temperature and moisture on breaking dormancy, in situ seed persistence and location of the water gap.