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

文献类型： 外文期刊

第一作者： Zhou, Zhenxiang

作者： Zhou, Zhenxiang;Zhang, Zichang;van der Putten, Peter E. L.;Struik, Paul C.;Yin, Xinyou;Fabre, Denis;Dingkuhn, Michael;Fabre, Denis;Dingkuhn, Michael;Fabre, Denis;Dingkuhn, Michael

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关键词： Adaxial versus abaxial measurement; Oryza sativa; panicle pruning; triose phosphate utilization; photorespiration-associated nitrogen assimilation; sink limitation; yellower-leaf modification

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.9； 五年影响因子：8.0 ）

ISSN： 0022-0957

年卷期： 2023 年

页码：

收录情况： SCI

摘要： 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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