Triose phosphate utilization in leaves is modulated by whole-plant sink–source ratios and nitrogen budgets in rice - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement
Journal Articles Journal of Experimental Botany Year : 2023

Triose phosphate utilization in leaves is modulated by whole-plant sink–source ratios and nitrogen budgets in rice

Abstract

Triose phosphate utilization (TPU) is a biochemical process indicating carbon sink-source (im)balance within leaves. When TPU limits leaf photosynthesis, photorespiration-associated amino acid exports probably provide an additional carbon outlet and increase leaf CO2 uptake. However, whether TPU is modulated by whole-plant sink-source relations and nitrogen (N) budgets remains unclear. We address this question by model analyses of gas-exchange data measured on leaves at three growth stages of rice plants grown at two N levels. Sink-source ratio was manipulated by panicle pruning, by using yellower-leaf variant genotypes, and by measuring photosynthesis on adaxial and abaxial leaf sides. Across all these treatments, higher leaf N content resulted in the occurrence of TPU limitation at lower intercellular CO2 concentrations. Photorespiration-associated amino acid export was greater in high-N leaves, but was smaller in yellower-leaf genotypes, panicle-pruned plants, and for abaxial measurement. The feedback inhibition of panicle pruning on rates of TPU was not always observed, presumably because panicle pruning blocked N remobilization from leaves to grains and the increased leaf N content masked feedback inhibition. The leaf-level TPU limitation was thus modulated by whole-plant sink-source relations and N budgets during rice grain filling, suggesting a close link between within-leaf and whole-plant sink limitations. While triose phosphate utilization limitation is a biochemical process indicating the carbon sink-source (im)balance within the leaf, this process is modulated by whole-plant source-sink ratios and nitrogen budgets in rice.
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hal-04490237 , version 1 (05-03-2024)

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Zhenxiang Zhou, Zichang Zhang, Peter E L van der Putten, Denis Fabre, Michael Dingkuhn, et al.. Triose phosphate utilization in leaves is modulated by whole-plant sink–source ratios and nitrogen budgets in rice. Journal of Experimental Botany, 2023, 74 (21), pp.6692 - 6707. ⟨10.1093/jxb/erad329⟩. ⟨hal-04490237⟩
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