Combinational dormancy in seeds of the Western Australian endemic species Diplopeltis huegelii (Sapindaceae)

S. R. Turner, D. J. Merritt, J. M. Baskin, C. C. Baskin, K. W. Dixon

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Seeds of the endemic Western Australian species Diplopeltis huegelii Endl. were successfully germinated after the presence of combinational dormancy was identified, following the observation of selected seed characteristics. D. huegelii seeds were found to have large, fully developed, peripheral coiled embryos (with no endosperm) that are 7-8 mm long when uncoiled. Seed-coat dormancy was overcome by dipping seeds in hot water for ≥15 s, but seeds also required a period of after-ripening before they would germinate readily. After-ripening occurred while intact seeds were stored dry at ambient laboratory conditions for 13 months or when scarified (hot-water treated) seeds were stored at 13, 23 or 50% RH at 23°C for 6 weeks. Scarified 13-month-old seeds germinated readily at 7/18, 13/26 and 18/33°C in a 12-h photoperiod and in constant darkness, whereas scarified 1-month-old seeds germinated to ≤43%. Thus, seed dormancy in this species is caused by a water-impermeable seed coat (physical dormancy, PY) and a (non-deep) physiologically dormant embryo (PD), i.e. combinational dormancy (PY + PD). This is only the second report of combinational dormancy in seeds of Sapindaceae and the first report in this family of the PD component of (PY + PD) being broken during dry storage.

Original languageEnglish
Pages (from-to)565-570
Number of pages6
JournalAustralian Journal of Botany
Issue number6
StatePublished - 2006

Bibliographical note

Funding Information:
The authors acknowledge the Australian Research Council for the provision of funding to make this research possible.

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science


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