Genotypic variation in source and sink traits affects the response of photosynthesis and growth to elevated atmospheric CO2

Fabre Denis, Dingkuhn Michael, Yin Xinyou, Clément-Vidal Anne, Roques Sandrine, Soutiras Armelle, Luquet Delphine. 2020. Genotypic variation in source and sink traits affects the response of photosynthesis and growth to elevated atmospheric CO2. Plant, Cell and Environment, 43 (3) : 579-593.

Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : This study aimed to understand the response of photosynthesis and growth to e‐CO2 conditions (800 vs. 400 μmol mol−1) of rice genotypes differing in source–sink relationships. A proxy trait called local C source–sink ratio was defined as the ratio of flag leaf area to the number of spikelets on the corresponding panicle, and five genotypes differing in this ratio were grown in a controlled greenhouse. Differential CO2 resources were applied either during the 2 weeks following heading (EXP1) or during the whole growth cycle (EXP2). Under e‐CO2, low source–sink ratio cultivars (LSS) had greater gains in photosynthesis, and they accumulated less nonstructural carbohydrate in the flag leaf than high source–sink ratio cultivars (HSS). In EXP2, grain yield and biomass gain was also greater in LSS probably caused by their strong sink. Photosynthetic capacity response to e‐CO2 was negatively correlated across genotypes with local C source–sink ratio, a trait highly conserved across environments. HSS were sink‐limited under e‐CO2, probably associated with low triose phosphate utilization (TPU) capacity. We suggest that the local C source–sink ratio is a potential target for selecting more CO2‐responsive cultivars, pending validation for a broader genotypic spectrum and for field conditions.

Mots-clés Agrovoc : Oryza sativa, génotype, changement climatique, photosynthèse, séquestration du carbone, dioxyde de carbone, plasticité phénotypique, variété

Mots-clés géographiques Agrovoc : Colombie

Mots-clés libres : Climate change, Carbon assimilation, CO2, Local source–sink ratio, Triose phosphate utilization, Enrichment, Oryza sativa, L. phenotypic plasticity, Sink limitation

Classification Agris : P40 - Météorologie et climatologie
F60 - Physiologie et biochimie végétale
F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : CTS 6 (2019-) - Changement climatique

Auteurs et affiliations

• Fabre Denis, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-6222-2587 - auteur correspondant
• Dingkuhn Michael, CIRAD-BIOS-UMR AGAP (FRA)
• Yin Xinyou, Wageningen University and Research Centre (NLD)
• Clément-Vidal Anne, CIRAD-BIOS-UMR AGAP (FRA)
• Roques Sandrine, CIRAD-BIOS-UMR AGAP (FRA)
• Soutiras Armelle, CIRAD-BIOS-UMR AGAP (FRA)
• Luquet Delphine, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-2543-7140

Source : Cirad-Agritrop (https://agritrop.cirad.fr/594835/)

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