Identification of successive flowering phases highlights a new genetic control of the flowering pattern in strawberry

Perrotte Justine, Guédon Yann, Gaston Amèlia, Denoyes Béatrice. 2016. Identification of successive flowering phases highlights a new genetic control of the flowering pattern in strawberry. Journal of Experimental Botany, 67 (19) : 5643-5655.

Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : The genetic control of the switch between seasonal and perpetual flowering has been deciphered in various perennial species. However, little is known about the genetic control of the dynamics of perpetual flowering, which changes abruptly at well-defined time instants during the growing season. Here, we characterize the perpetual flowering pattern and identify new genetic controls of this pattern in the cultivated strawberry. Twenty-one perpetual flowering strawberry genotypes were phenotyped at the macroscopic scale for their course of emergence of inflorescences and stolons during the growing season. A longitudinal analysis based on the segmentation of flowering rate profiles using multiple change-point models was conducted. The flowering pattern of perpetual flowering genotypes takes the form of three or four successive phases: an autumn-initiated flowering phase, a flowering pause, and a single stationary perpetual flowering phase or two perpetual flowering phases, the second one being more intense. The genetic control of flowering was analysed by quantitative trait locus mapping of flowering traits based on these flowering phases. We showed that the occurrence of a fourth phase of intense flowering is controlled by a newly identified locus, different from the locus FaPFRU, controlling the switch between seasonal and perpetual flowering behaviour. The role of this locus was validated by the analysis of data obtained previously during six consecutive years.

Mots-clés Agrovoc : Fragaria ananassa, floraison, génotype, expression des gènes, développement biologique, variation saisonnière, génie génétique, variation génétique, locus des caractères quantitatifs, modèle mathématique

Mots-clés géographiques Agrovoc : France

Mots-clés complémentaires : QTL

Mots-clés libres : Flowering phase, Fragaria × ananassa, Genetic control, Longitudinal data analysis, Multiple change-point model, Perpetual flowering

Classification Agris : F63 - Physiologie végétale - Reproduction
F30 - Génétique et amélioration des plantes
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Agences de financement européennes : European Commission

Programme de financement européen : FP7

Projets sur financement : (EU) The sustainable improvement of European berry production, quality and nutritional value in a changing environment: Strawberries, Currants, Blackberries, Blueberries and Raspberries

Auteurs et affiliations

• Perrotte Justine, CIREF (FRA)
• Guédon Yann, CIRAD-BIOS-UMR AGAP (FRA)
• Gaston Amèlia, INRA (FRA)
• Denoyes Béatrice, INRA (FRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/582093/)

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