New Zealand Journal of Botany abstracts
Short communication
The karyotype of Sophora tetraptera (Fabaceae)
Laura B. Stiefkens
Gabriel Bernardello
Instituto Multidisciplinario de Biología Vegetal (CONICET-UNC)
C.C. 495
5000 Córdoba, Argentina
Gregory J. Anderson
The University of Connecticut
Department of Ecology and Evolutionary Biology
Storrs, CT 06269-3043, USA
Abstract The karyotype of Sophora tetraptera
(Fabaceae (Leguminosae), subfam. Papilionoideae) is reported for the first
time. The chromosome number, 2n = 18, coincides with former reports
and is the most common number for the genus. The chromosomes are small (average
length 1.65 μm). The karyotype is composed of 8 m (metacentric) + 1 sm (submetacentric)
pairs. Microsatellites were observed on the short arm of the only sm pair.
The intrachromosomal and interchromosomal asymmetry indices were A1
= 0.16 and A2 = 0.12, respectively. The nine species of Sophora
analysed karyotypically so far in the literature suggest that karyotypic
features are useful. The diversification of the group apparently has been
accompanied by some chromosomal rearrangements yielding differences in karyotype
formula and secondary constrictions. Thus, karyotypic data in Sophora
are useful for elucidating its taxonomy and evolution.
Keywords chromosome numbers; karyotype; Sophora tetraptera;
Fabaceae (Leguminosae); New Zealand flora
B02090; Received 24 December 2002; accepted 20 June 2003; online publication
date 26 November 2003
New Zealand Journal of Botany, 2003, Vol. 41: 731-735
0028-825X/03/4104-0731 $7.00 © The Royal Society of New Zealand
2003
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