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why do citrus fruits have sections?

April 26, 2017citrus fruits

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why do citrus fruits have sections?

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Debra Rosenberg wrote: >Does anyone happen to know why citrus fruits like oranges and grapefruit >come in sections, while other fruits like apples and peaches do not? There are several major ways that plants have evolved for constructing fleshy fruits. Oranges etc. belong to the family Rutaceae, which is unique in filling its “locules” (the spaces in which seeds are produced) with “juice sacs” that are attached to the outer walls. Each of the locules probably represents a structure, known as a “carpel” that was at one time distinct, but now has fused together with its neighbors. The outer skin of most citrus fruits shows no sign that the interior is sectioned, but this is a result of the fusion occurring early in the development of each individual fruit (rather than early in the evolution of the Rutaceae). Apples belong to the family Rosaceae, along with the common rose; the apple that you buy at the store is in many ways essentially the same as a giant rose h