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Morphogenetic analysis of the phenotypic variability of the architectural unit of Hydrangea macrophylla

Analyse morphogénétique de la variabilité phénotypique de l’unité architecturale d’Hydrangea macrophylla

Annals of Forest Science volume 67, page 309 (2010)Cite this article

Abstract

  • • Hydrangea macrophylla is a ligneous plant that has attracted the attention of many plant breeders and agronomists for the purpose of enhancing its phenotypic plasticity. However, this plasticity was always exploited empirically.

  • • Can this plasticity be assessed by a more scientific approach? In this work, the phenotypic variation is analysed via a description of the different development sequences of the plant and by exposing the plant to different contrasted environments.

  • • The architectural unit consists of two morphogenetic units: the Vegetative Unit (VU) and the Vegetative and Floral Unit (VFU). They result in four successive development sequences: an organogenetic phase accompanied by continuous growth (sequence A), floral transformation (sequence B), dormancy (sequence C) and flower bloom (sequence D). Under the effect of environmental factors, the formation of the mixed terminal bud (sequence B) provides a considerable source of spatial variability, whereas the absence or presence of dormancy (sequence C) is responsible for a source of temporal variation.

  • • The in-depth description of the architectural unit with its morphological components and the characterisation of the four development sequences provide a necessary scientific basis to identify environmental effects on plant development and for the integrated use of its plasticity.

Résumé

  • • Hydrangea macrophylla est une plante ligneuse présentant une grande plasticité phénotypique qui a suscité l’intérêt de nombreux sélectionneurs et agronomes. Celle-ci a cependant toujours été exploitée de façon empirique.

  • • Peut-on évaluer cette plasticité par une approche plus scientifique? Dans ce travail, la variation phénotypique est analysée par une description fine des différentes séquences de développement de la plante et par l’exposition de la plante à des environnements contrastés.

  • • L’unité architecturale est composée de deux unités de morphogenèse : l’Unité Végétative et l’Unité Végétative et Florale. Elles résultent de quatre séquences de développement successives : une phase d’organogenèse accompagnée d’une croissance continue (séquence A), la transformation florale (séquence B), la dormance (séquence C) et l’épanouissement floral (séquence D). Sous l’effet des facteurs environnementaux, la formation du bourgeon mixte terminal (séquence B) offre une source de variabilité spatiale forte alors que l’absence ou la présence d’une dormance (séquence C) est à l’origine d’une source de variation temporelle.

  • • La description fine de l’unité architecturale avec ses composantes morphologiques et la caractérisation des quatre séquences de développement est une base scientifique nécessaire pour identifier et localiser les effets de l’environnement sur le développement de la plante et pour l’exploitation raisonnée de sa plasticité.

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Authors and Affiliations

  1. UMR SAGAH A 462, Sciences Agronomiques Appliquées à l’Horticulture, INRA, Agrocampus Ouest - Université d’Angers, 42 rue Georges Morel, B.P. 57, 49071, Beaucouzé, France

    Gilles Galopin & Philippe Morel

  2. UMR GenHort A 1259, INRA, Agrocampus Ouest, Université d’Angers, 42 rue Georges Morel, B.P. 57, 49071, Beaucouzé, France

    Jean-Claude Mauget

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  1. Gilles Galopin
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  2. Jean-Claude Mauget
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  3. Philippe Morel
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Correspondence to Gilles Galopin.

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Galopin, G., Mauget, JC. & Morel, P. Morphogenetic analysis of the phenotypic variability of the architectural unit of Hydrangea macrophylla . Ann. For. Sci. 67, 309 (2010). https://doi.org/10.1051/forest/2009115

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  • DOI: https://doi.org/10.1051/forest/2009115

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Annals of Forest Science

ISSN: 1297-966X