Cytogenetical studies of three <i>Vitis</i> species

Authors

  • T. A. Viljoen
  • J. J. Spies

DOI:

https://doi.org/10.5073/vitis.1995.34.221-224

Keywords:

chiasmata, chromosome, genome, grapevine, V-rupestris, V-rotundifolia, V-vinifera

Abstract

The aim of this study was to determine the genomic relationship between Vitis vinifera, V. rotundifolia and V. rupestris. The hybrid between V. vinifera and V. rotundifolia (RT88-2) was almost sterile, whereas the hybrid between V. vinifera and V. rupestris (RP88-14) was fertile. A low percentage (0.52%) of the F1 hybrid (RT88-2) seed germinated, provided that V. vinifera was the seed parent. The result of this one way ability to cross could possibly be attributed to the incompatibility between the cytoplasm of V. rotundifolia and the chromosomes of V. vinifera. The F1 hybrid RT88-2 had 39 chromosomes of which 19 were derived from V. vinifera and 20 from V. rotundifolia. The homology differs between the genomes of V. vinifera and V. rotundifolia. The sterility of the F1 hybrid was chromosomal and was reflected in the abnormal meiosis and lower chiasma frequency. The F1 hybrid RP88-14 had normal meiosis and a chiasma, frequency similar to that of the parents. This could be attributed to the fact that the parents (V. vinifera and V. rupestris) have the same chromosome number and are closely related.

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Published

2015-08-14

Issue

Vol. 34 No. 4 (1995): Vitis

Section

Article

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