Leaf production and expansion: A generalized response to drought stresses from cells to whole leaf biomass - A case study in the tomato compound leaf

Koch Garance, Rolland Gaëlle, Dauzat Myriam, Bédiée Alexis, Baldazzi Valentina, Bertin Nadia, Guédon Yann, Granier Christine. 2019. Leaf production and expansion: A generalized response to drought stresses from cells to whole leaf biomass - A case study in the tomato compound leaf. Plants, 8 (10):409, 17 p.

Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : It is clearly established that there is not a unique response to soil water deficit but that there are as many responses as soil water deficit characteristics: Drought intensity, drought duration, and drought position during plant cycle. For a same soil water deficit, responses can also differ on plant genotype within a same species. In spite of this variability, at least for leaf production and expansion processes, robust tendencies can be extracted from the literature when similar watering regimes are compared. Here, we present response curves and multi-scale dynamics analyses established on tomato plants exposed to different soil water deficit treatments. Results reinforce the trends already observed for other species: Reduction in plant leaf biomass under water stress was due to reduction in individual leaf biomass and areas whereas leaf production and specific leaf area were not affected. The dynamics of leaf expansion was modified both at the leaf and cell scales. Cell division and expansion were reduced by drought treatments as well as the endoreduplication process. Combining response curves analyses together with dynamic analyses of tomato compound leaf growth at different scales not only corroborate results on simple leaf responses to drought but also increases our knowledge on the cellular mechanisms behind leaf growth plasticity.

Mots-clés Agrovoc : Arabidopsis thaliana, déficit d'humidité du sol, Solanum lycopersicum, stress dû à la sécheresse, anatomie végétale, réponse de la plante, stade de développement végétal, eau du sol

Mots-clés libres : Leaf growth, Leaf production, Cell division, Cell expansion, Endoreduplication, Drought, Plasticity, Tomato

Agences de financement européennes : European Commission, European Regional Development Fund

Agences de financement hors UE : Agropolis Fondation, Conseil Régional Languedoc-Roussillon

Projets sur financement : (FRA) Agricultural Sciences for sustainable Development

Auteurs et affiliations

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

Source : Cirad-Agritrop (https://agritrop.cirad.fr/613330/)

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