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Annals of Botany 90: 391-398, 2002
© 2002 Annals of Botany Company

Natural and Induced Polyploidy in Acacia dealbata Link. and Acacia mangium Willd.

DAVID BLAKESLEY*,1, ANNABEL ALLEN1, TILL K. PELLNY1 and ANDY V. ROBERTS2

1 Horticulture Research International, East Malling, West Malling, Kent ME19 6BJ, UK and 2 Department of Life Sciences, University of East London, Romford Road, London E15 4LZ, UK

* For correspondence. Fax +44(0)1732 849067, e-mail david.blakesley{at}hri.ac.uk

Received: 1 March 2002; Returned for revision: 1 May 2002; Accepted: 18 June 2002

Seeds were obtained from seven natural populations of Acacia dealbata, three natural populations of A. mangium and a seed orchard of A. mangium, representing the natural range of the two species. Polyploids were discovered in two of the seven populations of A. dealbata. The 2C DNA amount for diploid A. dealbata (2n = 2x = 26) was 1·74 pg, and for diploid A. mangium (2n = 2x = 26) was 1·30 pg. A naturally occurring tetraploid of A. dealbata (2n = 4x = 52) had a 2C DNA amount of 3·41 pg and a naturally occurring triploid genotype had a 2C DNA amount of 2·53 pg. The use of colchicine and oryzalin was investigated as a means of producing higher frequencies of tetraploids of both A. mangium and A. dealbata for incorporation into breeding programmes. Colchicine treatment gave tetraploid frequencies up to 29 % for A. dealbata seedlings, and up to 18 % for A. mangium seedlings. In contrast, no tetraploid A. mangium was detected following oryzalin treatment, and the low frequencies of tetraploids observed in A. dealbata could be attributed to their natural occurrence.

Key words: Acacia dealbata Link., Acacia mangium Willd., colchicine, DNA amounts, flow cytometry, polyploidy,


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