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鉄欠乏時のオオムギ新葉へのFe流入速度とSUF経路の下方制御との関係

The Relationship between Fe influx into new leaf and downregulation of SUF machinery in Fe-deficient barley

樋口 恭子*; 佐々木 実莉*; 香取 摩耶*; 栗田 圭輔  ; 酒井 卓郎; 鈴井 伸郎*; 河地 有木*; 齋藤 彰宏*; 大山 卓爾*

Higuchi, Kyoko*; Sasaki, Minori*; Katori, Maya*; Kurita, Keisuke; Sakai, Takuro; Suzui, Nobuo*; Kawachi, Naoki*; Saito, Akihiro*; Oyama, Takuji*

硫黄輸送に関わる遺伝子の発現は、Feの枯渇によって低下する。そのパターンと時期はオオムギ品種によって異なり、その違いは鉄欠乏条件下での光化学系Iの維持に関係していると考えられる。しかし、これらのオオムギ品種の特性は、Fe欠乏に対する全体的な耐性や葉の総Fe濃度とは必ずしも相関していない。そこで、Fe欠乏オオムギの新葉へのFe流入とSUF機構の発現低下との関係を調べた。

Expression of genes involved in the Sulfur mobilization (SUF) machinery which assembles and inserts Fe-S clusters into client proteins in chloroplast is downregulated by depletion of Fe as a substrate. The pattern and timing of their downregulation are different among barley cultivars, and that difference seems to be related to the maintenance of Photosystem I under Fe-deficient condition. These characters of barley cultivars are, however, not always correlated with overall tolerance to Fe deficiency nor total Fe concentration of leaves. Thus, we investigated the relationship between Fe influx into new leaf and downregulation of SUF machinery in Fe-deficient barley.

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