A whole-plant analysis of the dynamics of expansion of individual leaves of two sunflower hybrids

Dosio Guillermo A.A., Rey Hervé, Lecoeur Jérémie, Izquierdo Natalia G., Aguirrezabal Luis A.N., Tardieu François, Turc Olivier. 2003. A whole-plant analysis of the dynamics of expansion of individual leaves of two sunflower hybrids. Journal of Experimental Botany, 54 (392) : 2541-2552.

Autre titre : Analyse au niveau de la plante entière de la dynamique d'expansion des feuilles prises individuellement chez deux hybrides de tournesol

Résumé : Common features in the time-course of expansion of leaves which considerably differed in final area, due to phytomer position, growing conditions and genotype, were identified. Leaf development consisted of two phases of exponential growth, followed by a third phase of continuous decrease of the relative expansion rate. The rate and the duration of the first exponential phase were common to all phytomers, growing conditions and genotypes. Leaves differed in the rate and the duration of the second exponential phase. The decrease of the relative expansion rate during the third phase depended on neither genotype nor growing conditions. It was phytomer-dependent and was deduced from the rate of the second phase via a parameter common to all cases studied. Differences in final leaf area among growing conditions were linked to different expansion rates during the second exponential phase. The duration of the phases at any given phytomer position was the same for the two hybrids in different growing conditions. The dates of developmental events (initiation, end of the two exponential phases, full expansion), and the rate of the second exponential phase, were related to phytomer position, defining a strict pattern of leaf development at the whole plant level. Using this framework simplified the analysis of the response of leaf expansion to genotype and environment.

Mots-clés Agrovoc : Helianthus annuus, hybride, feuille, croissance, facteur du milieu, morphogénèse, mesure (activité), génotype, phénotype

Classification Agris : F50 - Anatomie et morphologie des plantes
F62 - Physiologie végétale - Croissance et développement

Auteurs et affiliations

• Dosio Guillermo A.A., INRA (FRA)
• Rey Hervé, CIRAD-AMIS-AMAP (FRA)
• Lecoeur Jérémie, INRA (FRA)
• Izquierdo Natalia G., INTA (ARG)
• Aguirrezabal Luis A.N., INTA (ARG)
• Tardieu François, INRA (FRA)
• Turc Olivier, INRA (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/516293/)

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