カイワレダイコンの発芽・生長時における培養液中水素イオンとカリウムイオンの濃度変化 : アルカリ金属イオンの影響

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  • Concentration Change of Hydrogen Ions and Potassium Ions in a Culture Solution during the Germination and Growing Period of Radish : Effect of Alkali Metal Elements
  • カイワレダイコン ノ ハツガ セイチョウジ ニ オケル バイヨウエキチュウ ス

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The behavior of hydrogen ions and potassium ions in a culture solution containing alkali metal chloride was examined during germination and growing period of radish (Kaiware daikon). The radish was grown in the culture solution made up of pure water or in the solution containing alkali metal ions. The germination rate was ca. 70-95%. During the germination period (15-20h) from seed in the culture solution of pH5.0 the concentration of hydrogen ion shifted to ca. pH 7 with the passage of time, and the concentration of potassium ion increased. On the other hand, in the growing peroid (ca. 1 week), radish absorbed almost all potassium ion liberated in the germination period and liberated hydrogen ion. The correlation coefficient between hydrogen and potassium ion concentrations in the culture solution was between -0.98 and -0. 90,and a good negative correlation was observed between them. Next, to examine the influence of concentration of alkali metal ions was grown at pH 5 in solutions containing lithium, sodium, potassium, rubidium and cesium ions of concentration ranging from 10^-5 to 1 mol L^-1. The results showed that the incorporation of hydrogen ion was suppressed with the increase of alkali metal ions. On the other hand, in the growing period, coexisting sodium, potassium and rubidium ions were easily incorporated to kaiware. However, lithium and cesium were poorly incorporated.

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