Genotypic variation in source and sink traits affects the response of photosynthesis and growth to elevated atmospheric CO 2

This study aimed to understand the response of photosynthesis and growth to e-CO conditions (800 vs. 400 μmol mol ) 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 co...

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Bibliographic Details
Published in:Plant, cell and environment cell and environment, 2020-03, Vol.43 (3), p.579-593
Main Authors: Fabre, Denis, Dingkuhn, Michael, Yin, Xinyou, Clément-Vidal, Anne, Roques, Sandrine, Soutiras, Armelle, Luquet, Delphine
Format: Article
Language:English
Subjects:
Analysis of Variance
Atmosphere - chemistry
Biomass
Carbohydrates - chemistry
Carbon Dioxide - pharmacology
Carbon Sequestration - drug effects
Genetic Variation
Genotype
Oryza - drug effects
Oryza - genetics
Oryza - growth & development
Photosynthesis - drug effects
Photosynthesis - genetics
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Summary:This study aimed to understand the response of photosynthesis and growth to e-CO conditions (800 vs. 400 μmol mol ) 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 CO resources were applied either during the 2 weeks following heading (EXP1) or during the whole growth cycle (EXP2). Under e-CO , 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-CO was negatively correlated across genotypes with local C source-sink ratio, a trait highly conserved across environments. HSS were sink-limited under e-CO , 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 CO -responsive cultivars, pending validation for a broader genotypic spectrum and for field conditions.
ISSN:0140-7791
1365-3040
DOI:10.1111/pce.13693