Changes in the vertical distribution of leaf area enhanced light interception efficiency in maize over generations of maize selection

Perez Raphaël, Fournier Christian, Cabrera-Bosquet Llorenç, Artzet Simon, Pradal Christophe, Brichet Nicolas, Chen Tsu-Wei, Chapuis Romain, Welcker Claude, Tardieu François. 2019. Changes in the vertical distribution of leaf area enhanced light interception efficiency in maize over generations of maize selection. Plant, Cell and Environment, 42 (7) : 2105-219.

Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : Breeders select for yield, thereby indirectly selecting for traits that contribute to it. We tested if breeding has affected a range of traits involved in plant architecture and light interception, via the analysis of a panel of 60 maize hybrids released from 1950‐2015. This was based on novel traits calculated from reconstructions derived from a phenotyping platform. The contribution of these traits to light interception was assessed in virtual field canopies composed of 3D plant reconstructions, with a model tested in a real field. Two categories of traits had different contributions to genetic progress. (i) The vertical distribution of leaf area had a high heritability and showed a marked trend over generations of selection. Leaf area tended to be located at lower positions in the canopy, thereby improving light penetration and distribution in the canopy. This potentially increased the carbon availability to ears, via the amount of light absorbed by the intermediate canopy layer, (ii) Neither the horizontal distribution of leaves in the relation to plant rows nor the response of light interception to plant density showed appreciable trends with generations. Hence, among many architectural traits, the vertical distribution of leaf area was the main indirect target of selection.

Mots-clés Agrovoc : Zea mays, morphologie végétale, feuille, génotype, sélection, photosynthèse

Mots-clés complémentaires : Architecture végétale

Mots-clés libres : Architectural traits, Breeding, High throughput phenotyping, Light interception, Maize

Classification Agris : F50 - Anatomie et morphologie des plantes
F30 - Génétique et amélioration des plantes
F60 - Physiologie et biochimie végétale

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

Auteurs et affiliations

• Perez Raphaël, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-5270-9212
• Fournier Christian, INRA (FRA)
• Cabrera-Bosquet Llorenç, INRA (FRA)
• Artzet Simon, INRA (FRA)
• Pradal Christophe, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-2555-761X
• Brichet Nicolas, INRA (FRA)
• Chen Tsu-Wei, INRA (FRA)
• Chapuis Romain, INRA (FRA)
• Welcker Claude, INRA (FRA)
• Tardieu François, INRA (FRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/591414/)

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