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Plant Physiol

Title:		Biosynthesis of 2-Phenylethanol in Rose Petals Is Linked to the Expression of One Allele of RhPAAS
Author(s):		Roccia A; Hibrand-Saint Oyant L; Cavel E; Caissard JC; Machenaud J; Thouroude T; Jeauffre J; Bony A; Dubois A; Vergne P; Szecsi J; Foucher F; Bendahmane M; Baudino S;
Address:		"Universite Lyon, Universite Saint-Etienne, Centre National de la Recherche Scientifique, Laboratoire de Biotechnologies Vegetales appliquees aux Plantes Aromatiques et Medicinales, FRE 3727, F-42023 Saint-Etienne, France. Laboratoire Reproduction et Developpement des Plantes, Universite Lyon, Ecole Normale Superieure de Lyon, Universite Claude Bernard Lyon 1, Centre National de la Recherche Scientifique, Institut National de la Recherche Agronomique, F-69342 Lyon, France. Institut de Recherche en Horticulture et Semences, Agrocampus-Ouest, Institut National de la Recherche Agronomique, Universite d'Angers, Structure Federative de Recherche 4207 Qualite et Sante du vegetal, 49071 Beaucouze, France. Universite Lyon, Universite Saint-Etienne, Centre National de la Recherche Scientifique, Laboratoire de Biotechnologies Vegetales appliquees aux Plantes Aromatiques et Medicinales, FRE 3727, F-42023 Saint-Etienne, France sylvie.baudino@univ-st-etienne.fr"
Journal Title:		Plant Physiol
Year:		2019
Volume:		20190108
Issue:		3
Page Number:		1064 - 1079
DOI:		10.1104/pp.18.01468
ISSN/ISBN:		1532-2548 (Electronic) 0032-0889 (Print) 0032-0889 (Linking)
Abstract:		"Floral scent is one of the most important characters in horticultural plants. Roses (Rosa spp.) have been cultivated for their scent since antiquity. However, probably by selecting for cultivars with long vase life, breeders have lost the fragrant character in many modern roses, especially the ones bred for the cut flower market. The genetic inheritance of scent characters has remained elusive so far. In-depth knowledge of this quantitative trait is thus very much needed to breed more fragrant commercial cultivars. Furthermore, rose hybrids harbor a composite genomic structure, which complexifies quantitative trait studies. To understand rose scent inheritance, we characterized a segregating population from two diploid cultivars, Rosa x hybrida cv H190 and Rosa wichurana, which have contrasting scent profiles. Several quantitative trait loci for the major volatile compounds in this progeny were identified. One among these loci contributing to the production of 2-phenylethanol, responsible for the characteristic odor of rose, was found to be colocalized with a candidate gene belonging to the 2-phenylethanol biosynthesis pathway: the PHENYLACETALDEHYDE SYNTHASE gene RhPAAS An in-depth allele-specific expression analysis in the progeny demonstrated that only one allele was highly expressed and was responsible for the production of 2-phenylethanol. Unexpectedly, its expression was found to start early during flower development, before the production of the volatile 2-phenylethanol, leading to the accumulation of glycosylated compounds in petals"
Keywords:		Alleles Biosynthetic Pathways Flowers/genetics/metabolism Odorants Phenylethyl Alcohol/chemistry/*metabolism Plant Proteins/genetics/metabolism/*physiology Quantitative Trait Loci Rosa/genetics/*metabolism;
Notes:		"MedlineRoccia, Aymeric Hibrand-Saint Oyant, Laurence Cavel, Emilie Caissard, Jean-Claude Machenaud, Jana Thouroude, Tatiana Jeauffre, Julien Bony, Aurelie Dubois, Annick Vergne, Philippe Szecsi, Judit Foucher, Fabrice Bendahmane, Mohammed Baudino, Sylvie eng Research Support, Non-U.S. Gov't 2019/01/10 Plant Physiol. 2019 Mar; 179(3):1064-1079. doi: 10.1104/pp.18.01468. Epub 2019 Jan 8"