Affortit P. auteur aut IRD Effa-Effa B. auteur aut IRD Ndoye M. S. auteur aut IRD Moukouanga Daniel auteur aut IRD Luchaire N. auteur aut IRD Cabrera-Bosquet L. auteur aut IRD Peralvarez M. auteur aut IRD Pilloni Raphael auteur aut IRD Welcker C. auteur aut IRD Champion Antony auteur aut IRD Gantet Pascal auteur aut IRD Diedhiou A. G. auteur aut IRD Manneh B. auteur aut IRD Aroca R. auteur aut IRD Vadez Vincent auteur aut IRD Laplaze Laurent auteur aut IRD Cubry Philippe auteur aut IRD Grondin Alexandre auteur aut IRD text journalArticle eng text/pdf born digital access In African rice, higher transpiration efficiency is associated with transpiration restriction that is itself controlled by root-shoot growth balance. Genes potentially controlling these traits were identified. Improving crop water use efficiency, the amount of carbon assimilated as biomass per unit of water used by a plant, is of major importance as water for agriculture becomes scarcer. In rice, the genetic bases of transpiration efficiency, the derivation of water use efficiency at the whole-plant scale, and its putative component trait transpiration restriction under high evaporative demand remain unknown. These traits were measured in 2019 in a panel of 147 African rice (Oryza glaberrima) genotypes known to be potential sources of tolerance genes to biotic and abiotic stresses. Our results reveal that higher transpiration efficiency is associated with transpiration restriction in African rice. Detailed measurements in a subset of highly contrasted genotypes in terms of biomass accumulation and transpiration confirmed these associations and suggested that root to shoot ratio played an important role in transpiration restriction. Genome wide association studies identified marker-trait associations for transpiration response to evaporative demand, transpiration efficiency, and its residuals, with links to genes involved in water transport and cell wall patterning. Our data suggest that root-shoot partitioning is an important component of transpiration restriction that has a positive effect on transpiration efficiency in African rice. Both traits are heritable and define targets for breeding rice with improved water use strategies. specialized Genome-wide association study high-throughput phenotyping rice roots transpiration AFRIQUE AFRIQUE DE L'OUEST 076 [Early access] [15 ] 2022 0022-0957 https://www.documentation.ird.fr/hor/fdi:010085227 10.1093/jxb/erac156 0022-0957 [F B010085227] https://www.documentation.ird.fr/hor/fdi:010085227 https://www.documentation.ird.fr/intranet/publi/2022-07/010085227.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2022-07-01 2025-02-24 fdi:010085227 fre