Nitrogen resorption in senescing leaf blades of rice exposed to free-air CO2 enrichment (FACE) under different N fertilization levels

Shimpei Oikawa, Hitomi Ehara, Mika Koyama, Tadaki Hirose, Kouki Hikosaka, Charles P. Chen, Hirofumi Nakamura, Hidemitsu Sakai, Takeshi Tokida, Yasuhiro Usui, Toshihiro Hasegawa

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Aims: Nitrogen (N) resorption from senescing leaves is essential to meet N demand for grain development in rice (Oryza sativa L.). We asked whether rice is capable of reducing N in their senesced leaf blade to lower concentration at elevated [CO2] more in low than in high N fertilization. Methods: The effects of elevated [CO2] and N fertilization on senesced leaf N concentration were examined for 3 years with the free-air CO2 enrichment (FACE) technology. Results: Elevated [CO2] decreased the senesced leaf N concentration but the change was generally small and did not hold over the growing seasons. Additionally, there was no evidence that the change was greater at low than at high N fertilization levels. Conclusions: The 3-year field measurements showed that elevated [CO2] did not change the senesced leaf N concentration consistently. The occasional decrease in senesced leaf N concentration was associated with a decrease in green leaf N concentration at elevated [CO2] but not with the proportion of leaf N resorbed during leaf senescence.

    Original languageEnglish
    Pages (from-to)231-240
    Number of pages10
    JournalPlant and Soil
    Volume418
    Issue number1-2
    DOIs
    Publication statusPublished - 2017 Sep 1

    Keywords

    • Atmospheric carbon dioxide concentration
    • Global change
    • Leaf senescence
    • Litter production
    • Litter quality
    • Nitrogen retranslocation

    ASJC Scopus subject areas

    • Soil Science
    • Plant Science

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