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) : 2523-2534.

https://doi.org/10.1093/jxb/ery309

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : 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.

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

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

Agences de financement européennes : European Commission

Agences de financement hors UE : Agence Nationale de la Recherche

Programme de financement européen : H2020

Projets sur financement : (EU) European Plant Phenotyping Network 2020

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