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

journal contribution
posted on 2023-05-20, 22:43 authored by Quynh Nghiem, C, Anthony Griffin, Jane HarbardJane Harbard, Christopher HarwoodChristopher Harwood, Le, S, Duc Nguyen, K, Van Pham, B
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.

History

Publication title

Euphytica

Volume

214

Issue

4

Article number

77

Number

77

Pagination

1-14

ISSN

0014-2336

Department/School

School of Natural Sciences

Publisher

Kluwer Academic Publ

Place of publication

Van Godewijckstraat 30, Dordrecht, Netherlands, 3311 Gz

Rights statement

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

Repository Status

  • Restricted

Socio-economic Objectives

Hardwood plantations

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