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Journal of Heredity 2003:94(4)
© 2003 The American Genetic Association 94:329-333

Chromosome Doubling in Vine Cacti Hybrids

N. Tel-Zur, S. Abbo, D. Bar-Zvi, and Y. Mizrahi

From the Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel (Tel-Zur and Bar-Zvi); Department of Field Crops, Vegetables and Genetics, Hebrew University of Jerusalem, Rehovot 76100, Israel (Abbo); and Department of Life Sciences, Ben-Gurion University of the Negev and The Institutes for Applied Research, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel (Mizrahi).

Address correspondence to Y. Mizrahi, Institutes for Applied Research, Ben-Gurion University of the Negev, POB 653, Beer-Sheva 84105, Israel, or e-mail: mizrahi{at}bgumail.bgu.ac.il.

We performed reciprocal crosses between the tetraploid Selenicereus megalanthus and the diploid Hylocereus species, H. undatus and H. polyrhizus. S. megalanthus x H. undatus gave rise to viable hexaploids and 6x-aneuploid hybrids rather than to the expected triploids. No genuine hybrids were obtained in the reciprocal cross. The pollen diameter of the tetraploid S. megalanthus varied widely, indicating the occurrence of unreduced gametes, while that of H. undatus pollen was very uniform, indicating an extremely low frequency of unreduced gametes. This finding suggests that the hexaploids were formed by chromosome doubling after the formation of the hybrid triploid zygote rather than by fusion of unreduced gametes of the two species.


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