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動態丸山 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。
retrieving mechanisms at the shoot base to maintain low Na
concentration in the shoot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.