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Annals of Botany 89: 741-753, 2002
© 2002 Annals of Botany Company

Ploidy Levels among Species in the ‘Oxalis tuberosa Alliance’ as Inferred by Flow Cytometry

EVE EMSHWILLER0

0The Field Museum of Natural History, Botany Department, 1400 S. Lake Shore Drive, Chicago,Illinois 60606–2496, USA

* For correspondence. E-mail eemshwiller{at}fieldmuseum.org

Received: 5 November 2001; Returned for revision: 21 January 2002; Accepted: 11 March 2002.

The ‘Oxalis tuberosa alliance’ is a group of Andean Oxalis species allied to the Andean tuber crop O. tuberosa Molina (Oxalidaceae), commonly known as ‘oca’. As part of a larger project studying the origins of polyploidy and domestication of cultivated oca, flow cytometry was used to survey DNA ploidy levels among Bolivian and Peruvian accessions of alliance members. In addition, this study provided a first assessment of C-values in the alliance by estimating nuclear DNA contents of these accessions using chicken erythrocytes as internal standard. Ten Bolivian accessions of cultivated O. tuberosa were confirmed to be octoploid, with a mean nuclear DNA content of approx. 3·6 pg/2C. Two Peruvian wild Oxalis species, O. phaeotricha and O. picchensis, were inferred to be tetraploid (both with approx. 1·67 pg/2C), the latter being one of the putative progenitors of O. tuberosa identified by chloroplast-expressed glutamine synthetase data in prior work. The remaining accessions (from 78 populations provisionally identified as 35 species) were DNA diploid, with nuclear DNA contents varying from 0·79 to 1·34 pg/2C.

Key words: Andean crops, C-value, DNA ploidy, flow cytometry, nuclear DNA content, oca, Oxalidaceae, Oxalis tuberosa, octoploid, ploidy levels, polyploidy.


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