The percents of polyembryonic seeds of 65 tetraploid Citrus hybrids and 33 related, probable tetraploids were scored. These plants arose from crosses of 2 diploid, sexual, monoembryonic cultivars by a total of 6 tetraploid, partly asexual, polyembryonic pollen parents. Plants classed as strictly monoembryonic were recovered in progenies from 3 of the tetraploid parents. Individuals with low percentages of polyembryonic seeds were obtained in all progenies. The likelihood that 1 or 2 genes are responsible for polyembryony is discussed.
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Cameron et al. (1980) studied this question.