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Genetic and environmental dissection of biomass accumulation in multi-genotype maize canopies

Chen Tsu-Wei, Cabrera-Bosquet Llorenç, Alvarez Prado Santiago, Perez Raphaël, Artzet Simon, Pradal Christophe, Coupel-Ledru Aude, Fournier Christian, Tardieu François. 2019. Genetic and environmental dissection of biomass accumulation in multi-genotype maize canopies. Journal of Experimental Botany, 70 (9) : pp. 2523-2534.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Quartile : Outlier, Sujet : PLANT SCIENCES

Abstract : Multi-genotype canopies are frequent in phenotyping experiments and raise increasing interest in agriculture. Radiation interception efficiency (RIE) and radiation use efficiency (RUE) have low heritabilities in such canopies. We propose a revised Monteith equation that identifies environmental and genetic components of RIE and RUE. An environmental term, component of RIE, characterizes the effect of the presence/absence of neighbours on light interception. The ability of a given plant to compete with its neighbours is then identified, which accounts for the genetic variability of RIE of plants having similar leaf areas. This method was used in three experiments in a phenotyping platform with 765 plants of 255 maize hybrids. As expected, the heritability of the environmental term was near-zero, whereas that of the competitiveness term increased with phenological stages, resulting in the identification of quantitative trait loci. In the same way, RUE was dissected in an effect of intercepted light and a genetic term. This approach was used for predicting the behaviour of individual genotypes in virtual multi-genotype canopies. A large effect of competitiveness was observed in multi-genotype but not in single-genotype canopies, resulting in a bias for comparing genotypes in breeding fields.

Mots-clés géographiques Agrovoc : Languedoc-Roussillon

Classification Agris : F30 - Plant genetics and breeding
F62 - Plant physiology - Growth and development

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Agence(s) de financement européenne(s) : European Commission

Programme de financement européen : H2020

Projet(s) de financement européen(s) : European Plant Phenotyping Network 2020

Agence de financement hors UE : Agence Nationale de la Recherche

Auteurs et affiliations

  • Chen Tsu-Wei, INRA (FRA) - auteur correspondant
  • Cabrera-Bosquet Llorenç, INRA (FRA)
  • Alvarez Prado Santiago, Université de Montpellier (FRA)
  • Perez Raphaël, Université de Montpellier (FRA)
  • Artzet Simon, INRA (FRA)
  • Pradal Christophe, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-2555-761X
  • Coupel-Ledru Aude, Université de Montpellier (FRA)
  • Fournier Christian, INRA (FRA)
  • Tardieu François, INRA (FRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/588701/)

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