Growth-defence trade-off in rice: Fast-growing and acquisitive genotypes have lower expression of genes involved in immunity

de Tombeur Felix, Pélissier Rémi, Shihan Ammar, Rahajaharilaza Koloina, Fort Florian, Mahaut Brigitte, Lemoine Taïna, Thorne Sarah J., Hartley Sue E., Luquet Delphine, Fabre Denis, Lambers Hans, Morel Jean-Benoit, Ballini Elsa, Violle Cyrille. 2023. Growth-defence trade-off in rice: Fast-growing and acquisitive genotypes have lower expression of genes involved in immunity. Journal of Experimental Botany, 74 (10) : 3094-3103.

Résumé : Plant ecologists and molecular biologists have long considered the hypothesis of a trade-off between plant growth and defence separately. In particular, how genes thought to control the growth-defence trade-off at the molecular level relate with trait-based frameworks in functional ecology, such as the slow-fast plant economics spectrum, is unknown. We grew 49 phenotypically diverse rice genotypes in pots under optimal conditions, and we measured growth-related functional traits and the constitutive expression of 11 genes involved in plant defence. We also quantified the concentration of silicon (Si) in leaves to estimate silica-based defences. Rice genotypes were aligned along a slow-fast continuum, with fast-growing, early-flowering genotypes vs late-flowering, slow-growing genotypes. Leaf dry matter content and leaf Si concentrations were not aligned with this axis and negatively correlated with each other. Live-fast genotypes exhibited greater expression of OsNPR1, a regulator of the salicylic acid pathway that promotes plant defence while suppressing plant growth. These genotypes also exhibited greater expression of SPL7 and GH3.2 that are also involved in both stress resistance and growth. Our results do not support the hypothesis of a growth-defence trade-off when leaf Si and LDMC are considered, but they do when hormonal pathway genes are considered. We demonstrate the benefits of combining ecological and molecular approaches to elucidate the growth-defence trade-off, opening new avenues for plant breeding and crop science.

Mots-clés Agrovoc : Oryza sativa, expression des gènes, génotype, amélioration des plantes, phénotype, croissance, gène, Oryza, immunité, collection de matériel génétique

Mots-clés géographiques Agrovoc : France

Mots-clés libres : Growth-defence trade-off, Rice (Oryza sativa), Plant immunity, Intraspecific variation, Defence gene

Classification Agris : F30 - Génétique et amélioration des plantes
F62 - Physiologie végétale - Croissance et développement
H10 - Ravageurs des plantes

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Agences de financement européennes : European Commission, European Research Council

Agences de financement hors UE : Agence Nationale de la Recherche

Programme de financement européen : H2020

Projets sur financement : (EU) Silicon and the plant economics spectrum: a trait-based approach at the interface of physiological and ecosystem ecology, (EU) Ecophysiological and biophysical constraints on domestication in crop plants, (FRA) MUSE

Auteurs et affiliations

• de Tombeur Felix, Université de Montpellier (FRA) - auteur correspondant
• Pélissier Rémi, Université de Montpellier (FRA)
• Shihan Ammar, Université de Montpellier (FRA)
• Rahajaharilaza Koloina, CIRAD-BIOS-UMR AGAP (FRA)
• Fort Florian, CEFE (FRA)
• Mahaut Brigitte, Université de Montpellier (FRA)
• Lemoine Taïna, Université de Montpellier (FRA)
• Thorne Sarah J., University of Sheffield (GBR)
• Hartley Sue E., University of Sheffield (GBR)
• Luquet Delphine, CIRAD-DG-Direction générale (FRA) ORCID: 0000-0002-2543-7140
• Fabre Denis, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-6222-2587
• Lambers Hans, University of Western Australia (AUS)
• Morel Jean-Benoit, INRAE (FRA)
• Ballini Elsa, Montpellier SupAgro (FRA)
• Violle Cyrille, CEFE (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/604127/)

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