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丸山 哲平*; 鈴井 伸郎; 藤巻 秀; 河地 有木; 石井 里美; 松橋 信平; 吉羽 雅昭*; 但野 利秋*; 樋口 恭子*
no journal, ,
ヨシは強い耐塩性を示すイネ科の多年生草本であり、塩ストレス条件下でも地上部のNa含有率を低く維持できる。このヨシにおけるNaの挙動を解析するために、放射性同位体であるNaによるトレーサー実験を行ったところ、ヨシが塩ストレス条件下で地上部の低Na含有率を維持できるのは地上部からのNa排出よりも根部から地上部へのNa移行を強く抑制していることに起因することを示唆する結果が得られた。
丸山 哲平*; 鈴井 伸郎; 河地 有木; 藤巻 秀; 吉羽 雅昭*; 三輪 睿太郎*; 樋口 恭子*
no journal, ,
The Na concentration in common reed roots is similar to that in rice roots, while common reed shoots have lower Na concentration than rice shoots. It has been suggested that in common reed, Na translocation to the shoot is inhibited at the shoot base (SB). To evaluate the SB contribution to the inhibition of Na translocation to the shoots and determine the Na translocation pathway in the SB, we analyzed the kinetics of Na in common reed and in rice under the 50mM NaCl stress condition by performing a non-invasive tracer experiment with the positron-emitting tracer imaging system (PETIS). The PETIS experiments showed that Na accumulation is slower in the SB and the shoots of common reed than in those of rice. The Na accumulated in the shoots of both species was not actively excluded under the continuous mild saline condition. Modeling of the Na fluxes within the SB revealed that common reed strongly retrieved Na from the xylem at the SB.