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Citrus is the most important fruit crop in the world, with a production of almost 100 million tonnes and acreage of 7.2 million hectares in 2001 (1). It is grown in more than 100 countries all over the world, mainly in tropical and subtropical areas (approximately 40° latitude in each side of the equator) where favourable soil and climatic conditions occur. Citrus fruits are marketed fresh or as processed...