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J Agric Food Chem. 2018 Mar 21;66(11):2877-2890. doi: 10.1021/acs.jafc.7b05635. Epub 2018 Mar 1.

Effect of Abscission Zone Formation on Orange ( Citrus sinensis) Fruit/Juice Quality for Trees Affected by Huanglongbing (HLB).

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USDA-ARS Horticultural Research Laboratory , Fort Pierce , Florida 34945 , United States.
Symrise AG , Teterboro , New Jersey 07608 , United States.
Southern Gardens Citrus Nursery LLC , Clewiston , Florida 33440 , United States.


Orange trees affected by huanglongbing (HLB) exhibit excessive fruit drop, and fruit loosely attached to the tree may have inferior flavor. Fruit were collected from healthy and HLB-infected ( Candidatus liberibacter asiaticus) 'Hamlin' and 'Valencia' trees. Prior to harvest, the trees were shaken, fruit that dropped collected, tree-retained fruit harvested, and all fruit juiced. For chemical analyses, sugars and acids were generally lowest in HLB dropped (HLB-D) fruit juice compared to nonshaken healthy (H), healthy retained (H-R), and healthy dropped fruit (H-D) in early season (December) but not for the late season (January) 'Hamlin' or 'Valencia' except for sugar/acid ratio. The bitter limonoids, many flavonoids, and terpenoid volatiles were generally higher in HLB juice, especially HLB-D juice, compared to the other samples. The lower sugars, higher bitter limonoids, flavonoids, and terpenoid volatiles in HLB-D fruit, loosely attached to the tree, contributed to off-flavor, as was confirmed by sensory analyses.


HLB; aroma volatiles; flavonoids; flavor; limonoids; qPCR; sensory

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