Contrasting breeding systems revealed in the rainforest genus Davidsonia (Cunoniaceae): Can polyembryony turn the tables on rarity?

Eliott, F. G., Shepherd, M., Rossetto, M., Bundock, P., Rice, N. and Henry, R. J. (2014) Contrasting breeding systems revealed in the rainforest genus Davidsonia (Cunoniaceae): Can polyembryony turn the tables on rarity?. Australian Journal of Botany, 62 6: 451-464. doi:10.1071/BT14063


Author Eliott, F. G.
Shepherd, M.
Rossetto, M.
Bundock, P.
Rice, N.
Henry, R. J.
Title Contrasting breeding systems revealed in the rainforest genus Davidsonia (Cunoniaceae): Can polyembryony turn the tables on rarity?
Formatted title
Contrasting breeding systems revealed in the rainforest genus Davidsonia (Cunoniaceae): Can polyembryony turn the tables on rarity?
Journal name Australian Journal of Botany   Check publisher's open access policy
ISSN 1444-9862
0067-1924
Publication date 2014-12
Year available 2014
Sub-type Article (original research)
DOI 10.1071/BT14063
Open Access Status
Volume 62
Issue 6
Start page 451
End page 464
Total pages 14
Place of publication Clayton, Australia
Publisher CSIRO
Collection year 2015
Language eng
Formatted abstract
Plant breeding systems can have a profound effect on a species ability to persist, colonise new areas and adapt to environmental change. Determining the breeding systems in rare and common congeners may shed light on factors influencing rarity. Endemic to Australia, the Davidsonia genus comprises three species of rainforest trees. The two sympatric, subtropical species, Davidsonia jerseyana (F.Muell. ex F.M.Bailey) G.Harden & J.B.Williams, and D. johnsonii G.Harden & J.B.Williams, are endangered whereas the tropical D. pruriens F.Muell. is widespread. Other than exclusive clonality in D. johnsonii, the reproductive systems in the genus are unknown. We used segregation analysis of microsatellite loci in open-pollinated progeny arrays to investigate the breeding systems in D. jerseyana and D. pruriens. Reproductive success, under glasshouse conditions, was measured by the proportion of viable seeds, germination rate and seedling growth and survival over 12 months. Davidsonia jerseyana appears to be predominantly selfing with high fecundity. In D. pruriens, polyembryony was common and 89% of the progeny were identical to the heterozygous maternal parent, implying likely apomixis. Overall, fecundity was significantly lower than for D. jerseyana, although survival was higher from D. pruriens polyembryonic than from monoembryonic seed. The high fecundity in D. jerseyana indicates a lack of inbreeding depression and also suggests that it would be less likely to be endangered than the less fecund D. pruriens. This raises the possibility that polyembryony and likely apomixis may provide a reproductive advantage to D. pruriens, which could otherwise share rarity with its congeners. 
Keyword Apomixis
Common comparison
Fecundity
Microsatellites
Polyploidy
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2015 Collection
 
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