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dc.contributor.authorChia, K.A.
dc.contributor.authorSadler, R.
dc.contributor.authorTurner, Shane
dc.contributor.authorBaskin, C.C.
dc.date.accessioned2022-05-17T09:41:21Z
dc.date.available2022-05-17T09:41:21Z
dc.date.issued2016
dc.identifier.citationChia, K.A. and Sadler, R. and Turner, S.R. and Baskin, C.C. 2016. Identification of the seasonal conditions required for dormancy break of Persoonia longifolia (Proteaceae), a species with a woody indehiscent endocarp. Annals of Botany. 118 (2): pp. 331-346.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/88503
dc.identifier.doi10.1093/aob/mcw100
dc.description.abstract

Background and Aims: The mechanisms involved in breaking seed dormancy in species with woody endocarps are poorly understood. In a landmark study examining the role of endocarps in regulating germination, our aim was to investigate the effects of the natural sequence of environmental conditions on dormancy break of a species with a woody endocarp (Persoonia longifolia).

Methods: The role of the endocarp in germination was investigated through imbibition and endocarp removal germination tests. The use of burial to break dormancy was examined and results from these experiments were used to guide laboratory investigations into the use of wet/dry cycling and stratification to break dormancy.

Key Results: Endocarps were water-permeable. Germination increased from 0 to 92·5 % when endocarps were removed. During burial in the field and nursery, 41·6 and 63·7 % of the endocarps germinated, respectively, after 36 months. Ex situ post-burial germination was cyclical and highest after 30 months of burial (45·4 % nursery and 31·8 % field). Highest germination occurred in wet/dry trials when the dry summer was long (20 weeks), had fluctuating temperatures (30/50 °C) and two long (7 d) wet cycles and was followed by moist winters at 10/20 °C. A stratification trial found that highest germination occurred following incubation for 12 weeks at 30 °C (including 2 weeks moist) + 6 weeks moist at 8 °C then placement at 20/10 °C for germination.

Conclusions: Summer conditions break physiological dormancy of the embryo and promote opening of the endocarp, allowing seeds to germinate during winter conditions. By closely monitoring the environment that endocarps are exposed to in nature, dormancy breaking mechanisms can be identified and used to improve germination. These results outline for the first time how dormancy and germination are regulated in a species with a hard woody endocarp, insights which will significantly improve our understanding of other species with similar reproductive features.

dc.languageeng
dc.subjectPersoonia longifolia
dc.subjectburial
dc.subjectdormancy break
dc.subjectphysiological dormancy
dc.subjectseed germination
dc.subjectstratification
dc.subjectwet/dry cycles
dc.subjectwoody endocarp
dc.subjectGermination
dc.subjectPlant Dormancy
dc.subjectProteaceae
dc.subjectSeasons
dc.subjectSeeds
dc.subjectWater
dc.subjectWood
dc.titleIdentification of the seasonal conditions required for dormancy break of Persoonia longifolia (Proteaceae), a species with a woody indehiscent endocarp
dc.typeJournal Article
dcterms.source.volume118
dcterms.source.number2
dcterms.source.startPage331
dcterms.source.endPage346
dcterms.source.issn0305-7364
dcterms.source.titleAnnals of Botany
dc.date.updated2022-05-17T09:41:20Z
curtin.departmentSchool of Molecular and Life Sciences (MLS)
curtin.accessStatusOpen access via publisher
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidTurner, Shane [0000-0002-9146-2977]
curtin.contributor.researcheridTurner, Shane [A-9950-2011]
dcterms.source.eissn1095-8290
curtin.contributor.scopusauthoridTurner, Shane [15740419900]


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