Elevated CO2 accelerates flag leaf senescence in wheat due to ear photosynthesis which causes greater ear nitrogen sink capacity and ear carbon sink limitation

Functional Plant Biology : FPB
Chunwu ZhuXingzeng Zhao

Abstract

It was anticipated that wheat net photosynthesis would rise under elevated CO2, and that this would alter the progress of senescence due to the unbalance of carbohydrates and nitrogen. Our study showed that ear carbon sink was limited, and sugar was accumulated, hexokinase activities and levels of phosphorylated sugar were increased within the flag leaves, grain nitrogen sink capacity was enhanced, and flag leaf senescence was accelerated under elevated CO2. However, if the ear of the main stem was covered, these responses to elevated CO2 were absent, and the senescence of flag leaf was not accelerated by elevated CO2. Thus, it appeared that elevated CO2 accelerated the rate of flag leaf senescence, depending on ear photosynthesis. The ears have far higher enhancement of net photosynthesis than flag leaves, and the role of the flag leaf relative to the ear was declined in supplying C assimilation to grain under elevated CO2. This indicates that as CO2 rises, the grain sink needs the N more than C assimilate from flag leaf, so the declining rates of N% and soluble proteins concentration were markedly accelerated under elevated CO2 conditions. This suggests that, the large increase in ear net photosynthesis accelerated grain fill...Continue Reading

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Citations

Jul 21, 2020·Journal of Experimental Botany·Guillaume TcherkezIker Aranjuelo
Jan 7, 2010·Journal of Experimental Botany·Xinyou Yin, Paul C Struik
Jul 17, 2014·Applied Microbiology and Biotechnology·Gaidi RenZhongjun Jia
Mar 1, 2013·Functional Plant Biology : FPB·Eduardo Dias de OliveiraJairo A Palta
Nov 13, 2013·Scientific Reports·Youzhi FengJianguo Zhu
Sep 27, 2013·TheScientificWorldJournal·Song ChenXiufu Zhang
Sep 14, 2018·The Science of the Total Environment·Chenjun DuYongheng Gao
Mar 7, 2021·International Journal of Molecular Sciences·Judit BányaiGyula Vida
Jan 15, 2021·Functional Plant Biology : FPB·Anowarul I BokshiKarolin Kunz

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