Wirt Atmar writes:

>Seedless
>varieties are almost always produced by hybridization of two fully sexual,
>normally genetically isolated species to produce a sterile hybrid so that no
>further floral fertilization (a pollen grain meets up with an ovule) is
>required for fruit set.

One exception is the navel orange. All of today's navel orange trees are
the result of sequential grafts of a single mutant orange tree found in
Brazil in the 1850s (not sure of the exact date).

-- Bruce


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