Humans have been growing citrus fruit for thousands of years. In this time growers have been able to breed a large number of varieties, with varying degrees of sweetness and sourness using selective breeding. The discovery of the genes responsible for sourness may change the way future plant breeders develop new varieties of citrus. The CitPH1 and CitPH5 genes are highly expressed in sour varieties, and weakly expressed in sweeter varieties, so breeding citrus with varying levels of these genes will allow growers to produce a wide assortment of new varieties.
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