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Common reed has efficient Na$$^{+}$$ retrieving mechanisms at the shoot base to maintain low Na$$^{+}$$concentration in the shoot

耐塩性植物ヨシの茎基部におけるナトリウム送り返し機構の解明

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*

Maruyama, Teppei*; Suzui, Nobuo; Kawachi, Naoki; Fujimaki, Shu; Yoshiba, Masaaki*; Miwa, Eitaro*; Higuchi, Kyoko*

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 $$^{22}$$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 $$^{22}$$Na$$^{+}$$ accumulation is slower in the SB and the shoots of common reed than in those of rice. The $$^{22}$$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.

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