Summary
Permanent translocation heterozygosity is confirmed in V. album in Europe, Japan, and California (where it is introduced), and reported for the first time in V. cruciatum from Israel. In V. album meiotic associations of
are reported in male plants; in female plants meiotic configurations of 10II, 8II + ⊙IV, 7II + ⊙VI, 6II + ⊙VIII were discovered. In Japanese populations of V. album male plants have 5II+⊙X and 6II + ⊙VIII, but female plants have 6II + ⊙VIII and 7II + ⊙VI, indicating that in this population translocation heterozygosity may be maintained by a system of balanced lethals similar to those in Onagraceae. Other populations of V. album and V. cruciatum preserve permanent heterozygosity through a sex associated system previously described in other species. Female predominant sex ratios ranging from 0·49 to 0·24 occur in both V. album and V. cruciatum.
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Barlow, B., Wiens, D., Wiens, C. et al. Permanent translocation heterozygosity in Viscum Album and V. Cruciatum: sex association, balanced lethals, sex ratios. Heredity 40, 33–38 (1978). https://doi.org/10.1038/hdy.1978.4
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DOI: https://doi.org/10.1038/hdy.1978.4
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