title: Distinct regulation in inflorescence carbohydrate metabolism according to grapevine cultivars during floral development.
abstract: Carbohydrate metabolism is important in plant sexual reproduction because sugar contents are determining factors for both flower initiation and floral organ development. In woody plants, flowering represents the most energy-consuming step crucial to reproductive success. Nevertheless, in these species, the photosynthesis performed by flowers supplies the carbon required for reproduction. In grapevine (Vitis vinifera), the inflorescence has a specific status because this organ imports carbohydrates at the same time as it exports photoassimilates. In this study, fluctuations in carbohydrate metabolism were monitored by analyzing gas exchanges, photosynthetic electron transport capacity, carbohydrate contents and some activities of carbohydrate metabolism enzymes, in the inflorescences of Pinot noir and Gewurztraminer, two cultivars with a different sensitivity to coulure phenomenon. Our results showed that photosynthetic activity and carbohydrate metabolism are clearly different and differently regulated during the floral development in the two cultivars. Indeed, the regulation of the linear electron flow and the cyclic electron flow is not similar. Moreover, the regulation of PSII activity, with a higher Y(NPQ)/Y(NO) ratio in Gewurztraminer, can be correlated with the higher protection of the photosynthetic chain and consequently with the higher yield under optimal conditions of this cultivar. At least, our results showed a higher photosynthetic activity and a better protection of PSI in Pinot noir during the floral development.
authors.affiliation: Laboratoire de Stress, Défenses et Reproduction des Plantes, UPRES EA4707, Université de Reims Champagne-Ardenne, UFR Sciences, Reims, France.
authors.forename: Mélodie
authors.initials: M
authors.lastname: Sawicki
authors.affiliation: Laboratoire de Stress, Défenses et Reproduction des Plantes, UPRES EA4707, Université de Reims Champagne-Ardenne, UFR Sciences, Reims, France.
authors.forename: Lucile
authors.initials: L
authors.lastname: Jacquens
authors.affiliation: Laboratoire de Stress, Défenses et Reproduction des Plantes, UPRES EA4707, Université de Reims Champagne-Ardenne, UFR Sciences, Reims, France.
authors.forename: Fabienne
authors.initials: F
authors.lastname: Baillieul
authors.affiliation: Laboratoire de Stress, Défenses et Reproduction des Plantes, UPRES EA4707, Université de Reims Champagne-Ardenne, UFR Sciences, Reims, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Clément
authors.affiliation: Laboratoire de Stress, Défenses et Reproduction des Plantes, UPRES EA4707, Université de Reims Champagne-Ardenne, UFR Sciences, Reims, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Vaillant-Gaveau
authors.affiliation: Laboratoire de Stress, Défenses et Reproduction des Plantes, UPRES EA4707, Université de Reims Champagne-Ardenne, UFR Sciences, Reims, France.
authors.forename: Cédric
authors.initials: C
authors.lastname: Jacquard
mesh_terms: D000704:Analysis of Variance; D050260:Carbohydrate Metabolism / Q000235:genetics / Q000502:physiology*; D035264:Flowers / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D005632:Fructose / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D005947:Glucose / Q000378:metabolism; D056626:Inflorescence / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D010788:Photosynthesis / Q000235:genetics / Q000502:physiology; D045331:Photosystem I Protein Complex / Q000235:genetics / Q000378:metabolism; D045332:Photosystem II Protein Complex / Q000235:genetics / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012273:Ribulose-Bisphosphate Carboxylase / Q000235:genetics / Q000378:metabolism; D013045:Species Specificity; D013213:Starch / Q000378:metabolism; D013395:Sucrose / Q000378:metabolism; D027843:Vitis / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D000516:alpha-Amylases / Q000235:genetics / Q000378:metabolism; D001614:beta-Amylase / Q000235:genetics / Q000378:metabolism
chemical_list: D045331:Photosystem I Protein Complex; D045332:Photosystem II Protein Complex; D010940:Plant Proteins; D005632:Fructose; D013395:Sucrose; D013213:Starch; D000516:alpha-Amylases; D001614:beta-Amylase; D012273:Ribulose-Bisphosphate Carboxylase; D005947:Glucose