Significance of structural variation in thylakoid membranes in maintaining functional photosystems during reproductive growth

Hatsumi Nozue*, Kaori Oono, Yoshinobu Ichikawa, Shun Tanimura, Kana Shirai, Kintake Sonoike, Masayuki Nozue, Nobuaki Hayashida

*この研究の対応する著者

    研究成果: Article査読

    5 被引用数 (Scopus)

    抄録

    Structural variation in the stroma-grana (SG) arrangement of the thylakoid membranes, such as changes in the thickness of the grana stacks and in the ratio between grana and inter-grana thylakoid, is often observed. Broadly, such alterations are considered acclimation to changes in growth and the environment. However, the relation of thylakoid morphology to plant growth and photosynthesis remains obscure. Here, we report changes in the thylakoid during leaf development under a fixed light condition. Histological studies on the chloroplasts of fresh green Arabidopsis leaves have shown that characteristically shaped thylakoid membranes lacking the inter-grana region, referred to hereafter as isolated-grana (IG), occurred adjacent to highly ordered, large grana layers. This morphology was restored to conventional SG thylakoid membranes with the removal of bolting stems from reproductive plants. Statistical analysis showed a negative correlation between the incidences of IG-type chloroplasts in mesophyll cells and the rates of leaf growth. Fluorescence parameters calculated from pulse-amplitude modulated fluorometry measurements and CO2 assimilation data showed that the IG thylakoids had a photosynthetic ability that was equivalent to that of the SG thylakoids under moderate light. However, clear differences were observed in the chlorophyll a/b ratio. The IG thylakoids were apparently an acclimated phenotype to the internal condition of source leaves. The idea is supported by the fact that the life span of the IG thylakoids increased significantly in the later developing leaves. In conclusion, the heterogeneous state of thylakoid membranes is likely important in maintaining photosynthesis during the reproductive phase of growth.

    本文言語English
    ページ(範囲)111-123
    ページ数13
    ジャーナルPhysiologia Plantarum
    160
    1
    DOI
    出版ステータスPublished - 2017 5月 1

    ASJC Scopus subject areas

    • 生理学
    • 遺伝学
    • 植物科学
    • 細胞生物学

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