Original Research

The genus Rubus (Rosaceae) in South Africa. IV. Natural hybridiza­ tion

J. J. Spies, C. H. Stirton, H. du Plessis
Bothalia | Vol 17, No 1 | a1020 | DOI: https://doi.org/10.4102/abc.v17i1.1020 | © 1987 J. J. Spies, C. H. Stirton, H. du Plessis | This work is licensed under CC Attribution 4.0
Submitted: 22 October 1987 | Published: 23 October 1987

About the author(s)

J. J. Spies, Botanical Research Institute, Department of Agriculture and Water Supply, South Africa
C. H. Stirton, The Herbarium, Royal Botanical Gardens, South Africa
H. du Plessis, Botanical Research Institute, Department of Agriculture and Water Supply, South Africa

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Abstract

The genus  Rubus L. is represented in southern Africa by the subgenera  Eubatus Focke and  Idaeobatus Focke. A combination o f morphological data, data on the reproductive systems of some collections and meiotic chromosome behaviour indicates that a hybrid swarm in the eastern Transvaal was formed subsequent to the hybridization between R. cuneifolius Pursh. taxon B (subgenus Eubatus) and R. longepedicellatus (C. E. Gust.) C. H. Stirton (subgenus Idaeobatus). Other examples of intra- and intersubgeneric hybridization were found during this study of the South African material. These instances, with examples found in the literature, indicate that the subgeneric subdivisions of Rubus are artificial.

Three different methods were used to analyse the meiotic chromosome configurations. The genome relationship system of Alonso & Kimber (1981) and Kimber & Alonso (1981) and the modification of the binomial system of Jackson & Casey (1980) by Spies (1984) proved to be the most sensitive for distinguishing between alio-, segmental alio- and autoploids.


Keywords

chromosomes; hybridization; polyploidy; reproduction. Rosaceae; <i>Rubus</i>; South Africa; speciation

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