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Reduced fertility in triploids of Acacia auriculiformis and its hybrid with A. mangium


Quynh Nghiem, C and Griffin, R and Harbard, JL and Harwood, CE and Le, S and Duc Nguyen, K and Van Pham, B, Reduced fertility in triploids of Acacia auriculiformis and its hybrid with A. mangium, Euphytica, 214, (4) Article 77. ISSN 0014-2336 (2018) [Refereed Article]

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Copyright Springer Science+Business Media B.V., part of Springer Nature 2018

DOI: doi:10.1007/s10681-018-2157-8


Polyploid breeding offers the possibility of increased variability in the search for improved growth, site adaptation and disease resistance in tropical acacias. A key focus of breeding in Vietnam has been the production and testing of vigorous triploid clones which are expected to have the added advantage of being sterile. Triploids obtained by manual crosses between diploid and tetraploid trees or by bulk screening of seedlings derived from open-pollinated seedlots were verified using flow cytometry. Thirteen clones are under field testing for growth rate, tree form and fertility. Six of these are now reproductively mature and flowered as prolifically as diploids. However no pollen germinated, either on agar or on their own stigmas under controlled pollination. Only one clone (X01-F1 hybrid of tetraploid A. mangium and diploid A. auriculiformis) produced open pollinated pods on 0.05% of hermaphrodite flowers and these contained an average of 1.3 filled seeds per pod, about one-fifth the number observed in diploids. Less than 25% of germinated progeny from this triploid clone survived at 3 months after sowing and survivors were severely stunted with arrested growth. Ploidy and genotype analysis revealed them to be predominantly aneuploids, ranging from hyperdiploid to hypotetraploid with 95% being selfs. We are confident that we can select triploid clones which will be effectively infertile if deployed in plantations and may be of particular value in situations where the normal prolific natural regeneration of tropical acacias is highly undesirable.

Item Details

Item Type:Refereed Article
Keywords:A. mangium, A. auriculiformis, polyploid breeding, triploid infertility, aneuploid, Acacia plantations, sterility
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Tree improvement (incl. selection and breeding)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:Griffin, R (Professor Rod Griffin)
UTAS Author:Harbard, JL (Ms Jane Harbard)
UTAS Author:Harwood, CE (Mr Christopher Harwood)
ID Code:143894
Year Published:2018
Web of Science® Times Cited:5
Deposited By:Office of the School of Natural Sciences
Deposited On:2021-04-09
Last Modified:2021-09-03

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