The breeding system of A. comosus combines efficient vegetative reproduction with functional allogamous sexual reproduction. Although the former is largely dominant, the latter is responsible for most of the present genetic variation. Pineapple allogamy, as well as its consequent heterozygosity, is related to the existence of self-incompatibility and pollination by hummingbirds. A high chromosome number also favours genetic recombination. A. macrodontes also combines vegetative and sexual reproduction, but apparently with a higher efficiency of the latter than in A. comosus, and it is not self-incompatible.
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