title: Environmental and seasonal influences on red raspberry anthocyanin antioxidant contents and identification of quantitative traits loci (QTL).
abstract: Consumption of raspberries promotes human health through intake of pharmaceutically active antioxidants, including cyanidin and pelargonidin anthocyanins; products of flavonoid metabolism and also pigments conferring colour to fruit. Raspberry anthocyanin contents could be enhanced for nutritional health and quality benefits utilising DNA polymorphisms in modern marker assisted breeding. The objective was to elucidate factors determining anthocyanin production in these fruits. HPLC quantified eight anthocyanin cyanidin and pelargonidin glycosides: -3-sophoroside, -3-glucoside, -3-rutinoside and -3-glucosylrutinoside across two seasons and two environments in progeny from a cross between two Rubus subspecies, Rubus idaeus (cv. Glen Moy)xRubus strigosus (cv. Latham). Significant seasonal variation was detected across pigments less for different growing environments within seasons. Eight antioxidants mapped to the same chromosome region on linkage group (LG) 1, across both years and from fruits grown in field and under protected cultivation. Seven antioxidants also mapped to a region on LG 4 across years and for both growing sites. A chalcone synthase (PKS 1) gene sequence mapped to LG 7 but did not underlie the anthocyanin quantitative traits loci (QTL) identified. Other candidate genes including basic-helix-loop-helix (bHLH), NAM/CUC2-like protein and bZIP transcription factor underlying the mapped anthocyanins were identified.
authors.affiliation: Centre for Food Quality, University of Strathclyde, SIPBS Royal College, Glasgow, UK.
authors.forename: Angzzas
authors.initials: A
authors.lastname: Kassim
authors.forename: Julie
authors.initials: J
authors.lastname: Poette
authors.forename: Alistair
authors.initials: A
authors.lastname: Paterson
authors.forename: Dzeti
authors.initials: D
authors.lastname: Zait
authors.forename: Susan
authors.initials: S
authors.lastname: McCallum
authors.forename: Mary
authors.initials: M
authors.lastname: Woodhead
authors.forename: Kay
authors.initials: K
authors.lastname: Smith
authors.forename: Christine
authors.initials: C
authors.lastname: Hackett
authors.forename: Julie
authors.initials: J
authors.lastname: Graham
mesh_terms: D000217:Acyltransferases / Q000235:genetics; D000872:Anthocyanins / Q000032:analysis*; D000975:Antioxidants / Q000032:analysis*; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics; D002851:Chromatography, High Pressure Liquid; D005638:Fruit / Q000737:chemistry* / Q000235:genetics* / Q000254:growth & development; D040641:Quantitative Trait Loci; D012621:Seasons
chemical_list: D000217:Acyltransferases; D000872:Anthocyanins; D000975:Antioxidants; D051792:Basic Helix-Loop-Helix Proteins; C020141:flavanone synthetase