New chromosome number records of South African Oxalis species

Citation
Ll. Dreyer et C. Johnson, New chromosome number records of South African Oxalis species, S AFR J BOT, 66(2), 2000, pp. 130-132
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
SOUTH AFRICAN JOURNAL OF BOTANY
ISSN journal
0254-6299 → ACNP
Volume
66
Issue
2
Year of publication
2000
Pages
130 - 132
Database
ISI
SICI code
0254-6299(200005)66:2<130:NCNROS>2.0.ZU;2-W
Abstract
Chromosome numbers of only 49 Oxalis L. taxa have been published to date, o f which just 23 represent southern African taxa. Chromosome counts for the following southern African taxa are recorded here for the first time: O. bi fida Thunb., O. hirta L. var. tubiflora Salter and O. semiloba Send. A thir d record for O. truncatula Jacq, is also presented here. Two previous count s for this species have been published, one revealing a tetraploid and the other a hexaploid: condition. All four taxa included here have a basic chro mosome number of x = 7. O. bifida and O. truncatula are both diploid, where as O. hirta var. tubiflora and O. semiloba were both found to be tetraploid . The diploid form of O. truncatula found here completes a polyploid series (2x, 4x and 6x) in this species. It is concluded that karyological data ca n greatly aid our understanding of the massive diversification and speciati on of Oxalis in southern Africa. Further cytological studies are recommende d.