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AOBPreview published online on April 4, 2007
Annals of Botany, doi:10.1093/aob/mcm043
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© The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Presence of Triploids among Oak Species

Artur Dzialuk1,*, Igor Chybicki1, Monika Welc2, Elwira Sliwinska3 and Jaroslaw Burczyk1

1 Department of Genetics
2 Department of Experimental Biology, Institute of Biology and Environmental Protection, Kazimierz Wielki University, Chodkiewicza 30, 85-064 Bydgoszcz, Poland
3 Department of Genetics and Plant Breeding, University of Technology and Life Sciences, al. Kaliskiego 7, 85-789 Bydgoszcz, Poland

* For correspondence. E-mail dzialuk{at}ukw.edu.pl

Received: 31 October 2006    Returned for revision: 3 January 2007    Accepted: 30 January 2007   

Background and Aims: Polyploids, organisms that have multiple sets of chromosomes, are common in certain plant and animal taxa. However, there are only a few reports of intraspecific ploidy variation within the genus Quercus. The aim of the study was to investigate the suspected ploidy level of two oaks that have unusual microsatellite banding patterns.

Methods: Polyploidy was investigated by using microsatellite analysis, stomata length measurements and nuclear DNA content estimation by flow cytometry.

Key Results: Each putative triploid tree has patterns of microsatellite variation unexpected for diploid genomes, with up to three alleles at some loci, significantly longer stomata and 1·5 times more DNA per nucleus compared with diploids.

Conclusions: To our knowledge, this report contains the first evidence for triploidy in Q. petraea and confirmation of this phenomenon in Q. robur. Regardless of the positive or negative aspects of the presence of triploid oaks in forest stands, it is of value to be able to screen for them. This study demonstrates that nuclear microsatellites and estimation of DNA content by flow cytometry can readily be used for this purpose.

Key words: Quercus robur, Quercus petraea, microsatellites, stomata, flow cytometry, DNA amounts, triploidy


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[Abstract] [Full Text] [PDF]


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