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AOBPreview published online on January 14, 2004
Annals of Botany, doi:10.1093/aob/mch037
© 2004 by Annals of Botany Company
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Submitted on August 11, 2003
Revised on October 16, 2003
Accepted on October 30, 2003

Genome Size Variation among Accessions of Arabidopsis thaliana

HEIKE SCHMUTHS1*, ARMIN MEISTER1, RALF HORRES1, and KONRAD BACHMANN1

Affiliation of the authors: 1 Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, D-06466 Gatersleben, Germany

* To whom correspondence should be addressed. E-mail: schmuths{at}ipk-gatersleben.de.

• Background and Aims Estimates of the amount of nuclear DNA of Arabidopsis thaliana, known to be among the lowest within angiosperms, vary considerably. This study aimed to determine genome size of a range of accessions from throughout the entire Eurasian range of the species.

• Methods Twenty accessions from all over Europe and one from Japan were examined using flow cytometry.

• Key Results Significant differences in mean C-values were detected over a 1·1-fold range. Mean haploid (1C) genome size was 0·215 pg (211 Mbp) for all analysed accessions. Two accessions were tetraploid.

• Conclusions A closer investigation of the DNA fractions involved in intraspecific genome size differences in this experimentally accessible species may provide information on the factors involved in stability and evolution of genome sizes.
Key words: Arabidopsis thaliana, genome size, flow cytometry, tetraploid, geographic correlation, C-value, intraspecific variation.


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