Abstract
Abstract Chromosomal analyses of several southern African Lycium species resulted in diploid (2n = 24: L. amoenum, L. bosciifolium, L. ferocissimum, L. oxycarpum, L. tenue), tetraploid (2n = 48: L. gariepense, L. strandveldense, L. hantamense), and hexaploid (2n = 72: L. tetrandrum) counts. Chromosomes in all species were short (mean length = 2.00 μm; mean haploid genome length = 23.77 μm). Further, all species shared a highly symmetrical karyotype formula with 10 m pairs and 2 sm pairs, except L. bosciifolium with only one sm pair. The first m pair had a terminal microsatellite on the short arms. Fluorescent chromosome banding patterns with CMA/ DAPI staining in the diploid species showed NOR-associated heterochromatin in the first satellited pair. The tetraploids L. gariepense and L. hantamense had two chromosome pairs with a CMA+/DAPI−terminal band. Phylogenetic studies have shown that the southern African species are included in a monophyletic group including all Old World Lycium; these species are like...
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