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Déterminismes génétiques et environnementaux des composantes architecturales à l'origine de l'élaboration de la forme du rosier buisson

Abstract : The shape and therefore the architecture of a potted ornamentalplant such as bush rose determines its visual quality. It can becontrolled by plant breeding and/or cultivation techniques suchas the environmental factor application. However, these methodsare used empirically and rarely take into account the Genotypex Environment interaction (GxE). Firstly, among three cultivationtechniques evaluated on fi ve to eight rose bush cultivars withcontrasted shapes, water restriction highly modifi ed the architectureleading to more compact plants. A high GxE interaction was revealedwith three architectural responses ranging from low to high. Theywere partly explained by different cytokinins and salicylic acidconcentrations between genotypes.Secondly, the genetic analysisby mapping of the bush rose architecture based on two connectedrepeat-blooming populations in segregation showed that most ofthe architectural traits were controlled by one or several QTLs withlow effects. Some of them were infl uenced by the environmentand/or by the genetic background. The introgression of such traitsin different genetic backgrounds for example will likely be diffi cult.This study underlined the importance of taking into considerationthe GxE and QTLxE interactions to better orientate breedingprograms but also to better use cultivation techniques in order to control plant architecture.
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Submitted on : Tuesday, March 13, 2018 - 2:34:07 PM
Last modification on : Monday, July 6, 2020 - 3:40:00 PM
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  • HAL Id : tel-01730649, version 1

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Camille Li-Marchetti. Déterminismes génétiques et environnementaux des composantes architecturales à l'origine de l'élaboration de la forme du rosier buisson. domain_sdv.ee.ecop. Agrocampus Ouest, 2016. Français. ⟨NNT : 2016NSARB275⟩. ⟨tel-01730649⟩

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