Chromosome doubling in vine cacti hybrids

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

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.

Original languageAmerican English
Pages (from-to)329-333
Number of pages5
JournalJournal of Heredity
Volume94
Issue number4
DOIs
StatePublished - Jul 2003

Bibliographical note

Funding Information:
This study was partially supported by the UCLA-BGU Program of Academic Cooperation. The authors thank Prof. G. Ladizinsky for the many instructive discussions in the course of this study and for his valuable comments on the manuscript. We extend our gratitude to Ms. Hadassa van Oss (Hebrew University of Jerusalem) and Mr. Joseph Mouyal (Ben-Gurion University of the Negev) for their skillful technical assistance and to Ms. Dorot Imber for her constructive criticism and for editing the manuscript.

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