title: Fruit-specific RNAi-mediated suppression of DET1 enhances carotenoid and flavonoid content in tomatoes.
abstract: Tomatoes are a principal dietary source of carotenoids and flavonoids, both of which are highly beneficial for human health. Overexpression of genes encoding biosynthetic enzymes or transcription factors have resulted in tomatoes with improved carotenoid or flavonoid content, but never with both. We attempted to increase tomato fruit nutritional value by suppressing an endogenous photomorphogenesis regulatory gene, DET1, using fruit-specific promoters combined with RNA interference (RNAi) technology. Molecular analysis indicated that DET1 transcripts were indeed specifically degraded in transgenic fruits. Both carotenoid and flavonoid contents were increased significantly, whereas other parameters of fruit quality were largely unchanged. These results demonstrate that manipulation of a plant regulatory gene can simultaneously influence the production of several phytonutrients generated from independent biosynthetic pathways, and provide a novel example of the use of organ-specific gene silencing to improve the nutritional value of plant-derived products.
authors.affiliation: Cell Signaling Laboratory, Stazione Zoologica, Villa Comunale, I-80121 Naples, Italy.
authors.forename: Ganga Rao
authors.initials: GR
authors.lastname: Davuluri
authors.forename: Ageeth
authors.initials: A
authors.lastname: van Tuinen
authors.forename: Paul D
authors.initials: PD
authors.lastname: Fraser
authors.forename: Alessandro
authors.initials: A
authors.lastname: Manfredonia
authors.forename: Robert
authors.initials: R
authors.lastname: Newman
authors.forename: Diane
authors.initials: D
authors.lastname: Burgess
authors.forename: David A
authors.initials: DA
authors.lastname: Brummell
authors.forename: Stephen R
authors.initials: SR
authors.lastname: King
authors.forename: Joe
authors.initials: J
authors.lastname: Palys
authors.forename: John
authors.initials: J
authors.lastname: Uhlig
authors.forename: Peter M
authors.initials: PM
authors.lastname: Bramley
authors.forename: Henk M J
authors.initials: HM
authors.lastname: Pennings
authors.forename: Chris
authors.initials: C
authors.lastname: Bowler
mesh_terms: D002338:Carotenoids / Q000096:biosynthesis*; D015536:Down-Regulation; D005419:Flavonoids / Q000096:biosynthesis*; D018506:Gene Expression Regulation, Plant; D018551:Solanum lycopersicum / Q000235:genetics / Q000378:metabolism*; D009753:Nutritive Value; D010940:Plant Proteins / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism; D030821:Plants, Genetically Modified / Q000235:genetics / Q000378:metabolism; D034622:RNA Interference
chemical_list: D005419:Flavonoids; D010940:Plant Proteins; C118232:tDET1 protein, Lycopersicon esculentum; D002338:Carotenoids