Cytogenetics of <i>Vitis</i> <p>V. Allotetraploids of <i>V. vinifera</i> L. x <i>V. rotundifolia</i> MICHX.</p>

Authors

  • G. Jelenković Department of Viticulture and Enology, University of California, Davis, California
  • H. P. Olmo Department of Viticulture and Enology, University of California, Davis, California

DOI:

https://doi.org/10.5073/vitis.1969.8.265-279

Abstract

  1. The allotetraploid hybrids obtained by colchicine treatment of the completely sterile F1 diploid hybrids revealed very low and erratic fertility. A great variation in the fertility between seedlings was the rule.
  2. There is no apparent relation between chromosome pairing at MI and fertility of the allotetraploid vines. Average bivalent formation in the allotetraploids varied between 25.0 and 31.1 per cell compared to the expected 39 if complete pairing occurred.
  3. In all of the allotetraploid seedlings dominance of V. rotundifolia morphological characters was evident, although several exceptions were noted.
  4. Autotetraploid clones of the two species could be hybridized only by using V. vinifera as a female and V. rotundifolia as a male parent.
  5. Crossing behaviour of the allotetraploid F1 hybrids is identical to diploid VR hybrids. Hybrids are crossable among themselves; they can be crossed successfully only as female parents to V. rotundifolia and as female or male parent to V. vinifera.
  6. A chromosomal ratio hypothesis is proposed to explain the unilateral crossability pattern between the two species and their hybrid derivaties. The alternative breeding procedures are given for testing this hypothesis.

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Published

2017-02-17

Issue

Vol. 8 No. 4 (1969): Vitis

Section

Article

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