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Occurrence of polyploidy in populations of Acacia dealbata in south-eastern Tasmania and cytotypic variation in reproductive traits


Nghiem, QC and Griffin, AR and Harwood, CE and Harbard, JL and Le, S and Price, A and Koutoulis, A, Occurrence of polyploidy in populations of Acacia dealbata in south-eastern Tasmania and cytotypic variation in reproductive traits, Australian Journal of Botany, 66, (2) pp. 152-160. ISSN 0067-1924 (2018) [Refereed Article]

Copyright Statement

Journal compilation copyright CSIRO 2018

DOI: doi:10.1071/BT17210


The frequency of polyploid trees in 10 populations of the predominantly diploid species Acacia dealbata subsp. dealbata Link in south-eastern Tasmania was determined using flow cytometry. At seven of the sites, all trees were diploid. At two sites, single triploid genets were found and, at a third, two tetraploids. Microsatellite markers were used to confirm that triploid trees distributed over an area of at least 930 m2 at the major study site were all ramets of a single genet. Three diploid clones were also confirmed at this site. The 16-grain polyads from the triploid genet were significantly larger than those from diploids, but only the diploid pollen showed any viability in vitro. At three months the green pods on diploids averaged 36 mm and contained four developing seeds per pod. Pods on the triploid were only 13 mm long, with no developing seeds. In spite of maturing pods, two of the diploids did not yield full seed, whereas two other diploids averaged only 0.1 seeds per pod. Seeds were not produced on triploid trees. The low reproductive output is discussed with reference to the breeding system and the impact of clonality on effective cross-pollination.

Item Details

Item Type:Refereed Article
Keywords:clonality, diploid, infertility, reproductive biology, tetraploid, triploid
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant developmental and reproductive biology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:Nghiem, QC (Miss Quynh Nghiem)
UTAS Author:Griffin, AR (Professor Rod Griffin)
UTAS Author:Harwood, CE (Mr Christopher Harwood)
UTAS Author:Harbard, JL (Ms Jane Harbard)
UTAS Author:Le, S (Mr Son Le)
UTAS Author:Price, A (Mrs Aina Price)
UTAS Author:Koutoulis, A (Professor Anthony Koutoulis)
ID Code:129275
Year Published:2018
Web of Science® Times Cited:1
Deposited By:Plant Science
Deposited On:2018-11-20
Last Modified:2019-03-26

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