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United States Department of Agriculture

Agricultural Research Service

Title: Citrus Ploidy Level Influence on the Flavonoid Composition in Juice and Leaf Tissue in Grapefruit Cultivars

Authors
item Berhow, Mark
item Tisserat, Brent

Submitted to: Proceedings of Florida State Horticultural Society
Publication Type: Abstract Only
Publication Acceptance Date: November 3, 1998
Publication Date: N/A

Technical Abstract: Diploid Citrus paradisi Macf. (grapefruit) cultivars (cvs.) were found to consistently contain higher levels of Brix %, acidity (i.e., citric acid/ml), and acid/Brix ratios in the juice than their tetraploid counterparts. In contrast, higher levels of narirutin, naringin, and neohesperidin were found in the fruit juices of tetraploid cvs. In naringin-dominate grapefruit leaf types such as Hall and Seedy Marsh, naringin levels were higher in tetraploid leaves than in diploid leaves. Hall leaves had less narirutin but more neohesperidin in tetraploid leaves than in diploid leaves. However in Seedy Marsh leaves, the opposite occurred. Neohesperidin-dominate leaf type Imperial and Royal cvs. have higher neohesperidin levels in tetraploid leaves than in diploid leaves while exhibiting less narirutin levels in tetraploid leaves than in diploid leaves. This research was conducted at the U. S. Department of Agriculture, Agricultural Research Service, Fruit & Vegetable Chemistry Laboratory, Pasadena, CA, a facility which was closed by the USDA in 1994.

Last Modified: 4/23/2014