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Seeds of the threatened dry rainforest tree Cadellia pentastylis (Surianaceae) are non-dormant

Published online by Cambridge University Press:  10 January 2022

Nathan J. Emery Open the ORCID record for Nathan J. Emery [Opens in a new window]  and
Justin C. Collette Open the ORCID record for Justin C. Collette [Opens in a new window]
Nathan J. Emery*
Affiliation:
The Australian PlantBank, Australian Institute of Botanical Science, Australian Botanic Garden, Mount Annan, NSW 2567, Australia
Justin C. Collette
Affiliation:
The Australian PlantBank, Australian Institute of Botanical Science, Australian Botanic Garden, Mount Annan, NSW 2567, Australia
*
*Author for Correspondence: Nathan J. Emery, E-mail: [email protected]
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Abstract

Cadellia pentastylis (Surianaceae) is an Australian endemic threatened rainforest tree. Irregular flowering and fruiting events coupled with high rates of infertility and insect predation has meant that seed testing has not been possible for this species. Seeds were opportunistically collected from a wild population in early 2021, which allowed for the first germination tests to be conducted. In this study, the presence of physical dormancy was examined by performing an imbibition test using scarified and non-scarified seeds. We also investigated whether a 5-min heat shock treatment at temperatures ranging from 60 to 120°C improved germination success. The presence of physiological dormancy was also examined by recording germination success following a gibberellic acid or smoke-water pre-treatment. Both scarified and non-scarified seeds readily imbibed water over a 72-h period, and several seeds had germinated in both treatments after 48 h. Final germination proportion and t50 following a heat shock, gibberellic acid or smoke-water pre-treatment did not significantly differ from the controls. We conclude that C. pentastylis seeds are non-dormant. Although a palisade cell layer has been reported in the endocarp, our results suggest that this layer may not be sufficiently formed to restrict germination. We recommend that seeds are collected from populations following dispersal and propagated shortly after or stored as conservation collections in ex situ Seedbanks.

Keywords

dry rainforestgerminationheat shockOolineseed dormancysmoke-water
Type
Short Communication
Information
Seed Science Research , Volume 31 , Issue 4 , December 2021 , pp. 333 - 337
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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References

Baskin, JM and Baskin, CC (2004) A classification system for seed dormancy. Seed Science Research 14, 1–16.CrossRefGoogle Scholar
Baskin, CC and Baskin, JM (2014) Seeds: ecology, biogeography, and, evolution of dormancy and germination. San Diego, Academic Press.Google Scholar
Baskin, JM, Baskin, CC and Li, X (2000) Taxonomy, anatomy and evolution of physical dormancy in seeds. Plant Species Biology 15, 139–152.CrossRefGoogle Scholar
Baskin, JM, Baskin, CC and Dixon, KW (2006) Physical dormancy in the endemic Australian genus Stylobasium, a first report for the family Surianaceae (Fabales). Seed Science Research 16, 229–232.Google Scholar
Beadle, NCW (1984) Simaroubaceae in Students Flora of North-eastern New South Wales, Part IV. Armidale, University of New England.Google Scholar
Benson, J (1993) The biology and management of Ooline (Cadellia pentastylis) in New South Wales. Hurstville, NSW, NSW National Parks and Wildlife Service.Google Scholar
Benson, J, Richards, P, Waller, S and Allen, C (2010) New South Wales vegetation classification and assessment: part 3 plant communities of the NSW Brigalow Belt South, Nandewar and west New England Bioregions and update of NSW Western Plains and South-western Slopes plant communities, Version 3 of the NSWVCA database. Cunninghamia 11, 457–579.Google Scholar
Chenu, K, Deihimfard, R and Chapman, SC (2013) Large-scale characterization of drought pattern: a continent-wide modelling approach applied to the Australian wheatbelt – spatial and temporal trends. New Phytologist 198, 801–820.CrossRefGoogle Scholar
Crawford, A, Cochrane, A, Breman, E, Harrison, PA, Quarmby, A and Driver, M (2021) Florabank guidelines module 6: seed collection in Commander LE (Ed) Florabank Guidelines (2nd edn). Australia, Florabank Consortium.Google Scholar
Cronquist, AJ (1981) An integrated system of classification of flowering plants. New York, Columbia University Press.Google Scholar
Curran, TJ and Curran, SR (2005) Rediscovery of Ooline, Cadellia pentastylis, near Gunnedah: notes on the habitat and ecology of this dry rainforest tree. Cunninghamia 9, 311–316.Google Scholar
Curran, TJ, Clarke, PJ and Bruhl, JJ (2008) A broad typology of dry rainforests on the western slopes of New South Wales. Cunninghamia 10, 381–405.Google Scholar
Emery, NJ and Collette, JC (2021) Drought stress affects the germination of four co-occurring Eucalyptus species from north-west New South Wales. Australian Journal of Botany 69, 143–151.CrossRefGoogle Scholar
Fernando, ES and Quinn, C (1992) Pericarp anatomy and systematics of the Simaroubaceae sensu lato. Australian Journal of Botany 40, 263–289.CrossRefGoogle Scholar
Floyd, AG (1990) Australian rainforests in New South Wales. NSW, Australia, Surrey Beatly and Sons.Google Scholar
Lucas, RM, Clewley, D, Accad, A, Butler, D, Armston, J, Bowen, M, Bunting, P, Carreiras, J, Dwyer, J and Eyre, T (2014) Mapping forest growth and degradation stage in the Brigalow Belt Bioregion of Australia through integration of ALOS PALSAR and Landsat-derived foliage projective cover data. Remote Sensing of Environment 155, 42–57.Google Scholar
Martyn Yenson, AJ, Offord, CA, Meagher, PF, Auld, T, Bush, D, Coates, DJ, Commander, LE, Guja, LK, Norton, SL, Makinson, RO, Stanley, R, Walsh, N, Wrigley, D and Broadhurst, L (2021) Plant Germplasm Conservation in Australia: strategies and guidelines for developing, managing and utilising ex situ collections (3rd edn). Canberra, Australian Network for Plant Conservation.Google Scholar
Nkang, A (2002) Carbohydrate composition during seed development and germination in two sub-tropical rainforest tree species (Erythrina caffra and Guilfoylia monostylis). Journal of Plant Physiology 159, 473–483.CrossRefGoogle Scholar
Pedley, L (1978) A revision of Acacia Mill. in Queensland. Austrobaileya 1, 75–234.Google Scholar
R Core Team (2021) R: a language and environment for statistical computing. Vienna, Austria, R Foundation for Statistical Computing.Google Scholar
Thusithana, V, Bellairs, SM and Bach, CS (2018) Seed germination of coastal monsoon vine forest species in the Northern Territory, Australia, and contrasts with evergreen rainforest. Australian Journal of Botany 66, 218–229.CrossRefGoogle Scholar
Tozer, MG and Ooi, MK (2014) Humidity-regulated dormancy onset in the Fabaceae: a conceptual model and its ecological implications for the Australian wattle Acacia saligna. Annals of Botany 114, 579–590.CrossRefGoogle ScholarPubMed