New chromosome reports in the subtribes Diocleinae and Glycininae (Phaseoleae: Papilionoideae: Fabaceae)

SHIRLEY M. ESPERT; SILVANA M. SEDE; LIZ K. RUIZ; RENÉE H. FORTUNATO; LIDIA POGGIO

BOTANICAL JOURNAL OF THE LINNEAN SOCIETY

Wiley-Blackwell

Lugar: London; Año: 2008 vol. 158 p. 336 - 341

0024-4074

The base chromosome number of x = 11 is the most probable in all the subtribes included in tribe Phaseoleae,although some aneuploid reduction is evident in Collaea and Galactia (Diocleinae) and chromosome duplicationsare seen in Amphicarpaea, Cologania and Glycine (Glycininae). The aims of this study were to improve thecytological knowledge of some species of Collaea and Galactia and to examine the anomalous counts reported forCalopogonium (Glycininae) and verify its taxonomic position. In addition, a molecular phylogeny was constructedusing nuclear ribosomal DNA sequences (internal transcribed spacer region), and the chromosome number wasoptimized on the topology. In this work, the chromosome counts for Galactia lindenii, Galactia decumbens andCollaea cipoensis (all 2n = 20), and Calopogonium sericeum (2n = 22) are reported for the first time. The newreports for Galactia and Collaea species are in agreement with the chromosome number proposed for subtribeDiocleinae. The study rejects the concept of a cytologically anomalous Calopogonium and, based on the phylogeneticanalysis, corroborates the position of this genus within subtribe Glycininae. The ancestral basic chromosomenumber of x = 11 proposed for Phaseoleae is in agreement with the evolutionary pathway of chromosome numbersanalysed in this work. © 2008 The Linnean Society of London, Botanical Journal of the Linnean Society, 2008,158, 336–341.