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    Germinability of seeds stored in capsules on plants of two myrtaceous shrubs: Differences among age cohorts and between species

    Access Status
    Fulltext not available
    Authors
    Kim, J.
    Walck, J.
    Hidayati, S.
    Merritt, D.
    Dixon, Kingsley
    Date
    2009
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Kim, J. and Walck, J. and Hidayati, S. and Merritt, D. and Dixon, K. 2009. Germinability of seeds stored in capsules on plants of two myrtaceous shrubs: Differences among age cohorts and between species. Australian Journal of Botany. 57 (6): pp. 495-501.
    Source Title
    Australian Journal of Botany
    DOI
    10.1071/BT09088
    ISSN
    0067-1924
    School
    Department of Environment and Agriculture
    URI
    http://hdl.handle.net/20.500.11937/16538
    Collection
    • Curtin Research Publications
    Abstract

    Canopy-stored seed banks are a common trait among members of several plant families in sclerophyllous woodlands of Australia and South Africa, with their fruits usually opening in response to damage or fire. Unknown is whether the degree of dormancy and of germination differs among age cohorts in seeds stored on the mother plant. We examined the extent and speed of germination from two intensely serotinous myrtaceous species, Callistemon glaucus and Calothamnus quadrifidus, for seed held in capsules for up to 9 years. Germination of both species differed significantly among age cohorts (P>0.0001). However, no consistent increase in germination over a range of temperatures with storage was found, suggesting that no after-ripening occurred and that seeds were non-dormant at maturity. Differences among cohorts may be due to pre-conditioning. Significant (P=0.0214) differences occurred between the small-seeded Callistemon and the large-seeded Calothamnus. Germination was (1) optimum at <20°C for Callistemon but at <20°C for Calothamnus, (2) 912 days earlier for Callistemon than for Calothamnus, and (3) higher in light than in darkness for Callistemon but equal in both light conditions for Calothamnus. While germination of the species differed in important features, we would expect synchronous germination of all age cohorts to occur following fire and the onset of regular rainfall. © 2009 CSIRO.

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