Are compound leaves more complex than simple ones? A multi-scale analysis

Koch Garance, Rolland Gaëlle, Dauzat Myriam, Bédiée Alexis, Baldazzi Valentina, Bertin Nadia, Guédon Yann, Granier Christine. 2018. Are compound leaves more complex than simple ones? A multi-scale analysis. Annals of Botany, 122 (7) : 1173-1185.

Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : Background and Aims: The question of which cellular mechanisms determine the variation in leaf size has been addressed mainly in plants with simple leaves. It is addressed here in tomato taking into consideration the expected complexity added by the several lateral appendages making up the compound leaf, the leaflets. Methods: Leaf and leaflet areas, epidermal cell number and areas, and endoreduplication (co-) variations were analysed in Solanum lycopersicum considering heteroblastic series in a wild type (Wva106) and an antisense mutant, the Pro35S:Slccs52AAS line, and upon drought treatments. All plants were grown in an automated phenotyping platform, PHENOPSIS, adapted to host plants grown in 7 L pots. Key Results: Leaf area, leaflet area and cell number increased with leaf rank until reaching a plateau. In contrast, cell area slightly decreased and endoreduplication did not follow any trend. In the transgenic line, leaf area, leaflet areas and cell number of basal leaves were lower than in the wild type, but higher in upper leaves. Reciprocally, cell area was higher in basal leaves and lower in upper leaves. When scaled up at the whole sympodial unit, all these traits did not differ significantly between the transgenic line and the wild type. In response to drought, leaf area was reduced, with a clear dose effect that was also reported for all size-related traits, including endoreduplication. Conclusions: These results provide evidence that all leaflets have the same cellular phenotypes as the leaf they belong to. Consistent with results reported for simple leaves, they show that cell number rather than cell size determines the final leaf areas and that endoreduplication can be uncoupled from leaf and cell sizes. Finally, they re-question a whole-plant control of cell division and expansion in leaves when the Wva106 and the Pro35S:Slccs52AAS lines are compared.

Classification Agris : F60 - Physiologie et biochimie végétale
F30 - Génétique et amélioration des plantes

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

Auteurs et affiliations

• Koch Garance, Université de Montpellier (FRA)
• Rolland Gaëlle, INRA (FRA)
• Dauzat Myriam, Université de Montpellier (FRA)
• Bédiée Alexis, Université de Montpellier (FRA)
• Baldazzi Valentina, INRA (FRA)
• Bertin Nadia, INRA (FRA)
• Guédon Yann, CIRAD-BIOS-UMR AGAP (FRA)
• Granier Christine, Montpellier SupAgro (FRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/590346/)

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