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

Denis Fabre*, Xinyou Yin, Michael Dingkuhn, Anne Clément-Vidal, Sandrine Roques, Lauriane Rouan, Armelle Soutiras, Delphine Luquet, Tracy Lawson

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)5773-5785
Number of pages13
JournalJournal of Experimental Botany
Volume70
Issue number20
DOIs
Publication statusPublished - 15 Oct 2019

Keywords

  • Climate change
  • CO enrichment
  • photosynthesis
  • rice
  • sink feedback
  • source-sink
  • sucrose
  • triose phosphate utilization

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    Fabre, D., Yin, X., Dingkuhn, M., Clément-Vidal, A., Roques, S., Rouan, L., Soutiras, A., Luquet, D., & Lawson, T. (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), 5773-5785. https://doi.org/10.1093/jxb/erz318