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Annals of Botany 84: 39-48, 1999
© 1999 Annals of Botany Company

Confirmation of Ancient Polyploidy in Dahlia (Asteraceae) Species using Genomic In Situ Hybridization

MELANIE GATT, KEITH HAMMETT and BRIAN MURRAY+

School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand Hammett Plant Breeding Ltd., 488C Don Buck Road, Massey, Auckland, 8, New Zealand

December 8, 1988 ; March 9, 1999 . March 22, 1999

The successful production of interspecific hybrids between members of the dysploid chromosome series inDahlia offers a unique opportunity to investigate chromosome evolution. Analysis of meiotic metaphase I in these hybrids using genomic in situ hybridization (GISH) has shown that pairing occurs both between and within parental genomes. These results have provided clear evidence for the allotetraploid origin of Dahlia species with 2n=32 and suggests that species with 2n=34 and 2n=36 have also arisen via allopolyploidy. A bivalent promoting mechanism proposed for species with 2n=32 also appears to be present in Dahlia species with 2n=34 and 2n=36 .Copyright 1999 Annals of Botany Company

Dahlia , GISH, dysploidy, chromosome pairing, karyotype analysis, polyploidy.


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