Is triose phosphate utilization involved in the feedback inhibition of photosynthesis in rice under conditions of sink limitation?

Fabre Denis, Yin Xinyou, Dingkuhn Michael, Clément-Vidal Anne, Roques Sandrine, Rouan Lauriane, Soutiras Armelle, Luquet Delphine. 2019. Is triose phosphate utilization involved in the feedback inhibition of photosynthesis in rice under conditions of sink limitation?. Journal of Experimental Botany, 70 (20):erz318 : 5773-5785.

Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : This study aimed to understand the physiological basis of rice photosynthetic response to C source–sink imbalances, focusing on the dynamics of the photosynthetic parameter triose phosphate utilization (TPU). Here, rice (Oriza sativa L.) indica cultivar IR64 were grown in controlled environment chambers under current ambient CO2 concentration until heading, and thereafter two CO2 treatments (400 and 800 μmol mol−1) were compared in the presence and absence of a panicle-pruning treatment modifying the C sink. At 2 weeks after heading, photosynthetic parameters derived from CO2 response curves, and non-structural carbohydrate content of flag leaf and internodes were measured three to four times of day. Spikelet number per panicle and flag leaf area on the main culm were recorded. Net C assimilation and TPU decreased progressively after midday in panicle-pruned plants, especially under 800 μmol mol−1 CO2. This TPU reduction was explained by sucrose accumulation in the flag leaf resulting from the sink limitation. Taking together, our findings suggest that TPU is involved in the regulation of photosynthesis in rice under elevated CO2 conditions, and that sink limitation effects should be considered in crop models.

Mots-clés Agrovoc : Oryza sativa, photosynthèse, relation source puits, dioxyde de carbone, changement climatique

Mots-clés géographiques Agrovoc : Philippines

Mots-clés libres : Climatic Change, Photosynthesis, Rice, Source-sink balance, CO2

Classification Agris : F60 - Physiologie et biochimie végétale
P40 - Météorologie et climatologie

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Fabre Denis, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-6222-2587 - auteur correspondant
• Yin Xinyou, Wageningen University and Research Centre (NLD)
• Dingkuhn Michael, CIRAD-BIOS-UMR AGAP (FRA)
• Clément-Vidal Anne, CIRAD-BIOS-UMR AGAP (FRA)
• Roques Sandrine, CIRAD-BIOS-UMR AGAP (FRA)
• Rouan Lauriane, 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/593334/)

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