Wednesday, February 27, 2008

Seedless fruits

Seedlessness is an essential feature of some fruits of commerce. Commercial cultivars of bananas and pineapples are exemplars of seedless fruits. Some cultivars of citrus fruits (particularly navel oranges and mandarin oranges), table grapes, grapefruit, and watermelons are valued for their seedlessness. In few species, seedlessness is the result of parthenocarpy, where fruits set without fertilization. Parthenocarpic fruit set might or might not require pollination. The majority seedless citrus fruits need a pollination stimulus; bananas and pineapples do not. Seedlessness in table grapes results from the abortion of the embryonic plant specifically produced by fertilization, a phenomenon known as stenospermocarpy which needs normal pollination and fertilization.

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