カイワレ種子の成長に対する溶液環境中の金属イオンの影響と側抑制

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  • The Effect of Metal Ion in The Medium on The Growth of Rahpanus sativus Seed and Lateral Inhibition
  • カイワレ シュシ ノ セイチョウ ニ タイスル ヨウエキ カンキョウ チュウ ノ キンゾク イオン ノ エイキョウ ト ソクヨクセイ

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The effects of metal ion concentration in the culture medium of Rahpanus sativus were investigated. A seed of R.sativus is known to uptake metal ion for its root growth, which produces ion influx and electrical potential along the root. However, in the very early stage of root growth, a R.sativus seed releases large amount of metal ion to the ambient medium. The reason and mechanism of this early ion release was still in question. We have examined the root growth of the root with only one or two seeds in a culture bessel, and shown that the single seed cannot grow in small volume culture medium because of the high ion concentration. On the other hand, in case of two seeds, this happened only to one seed and another one grows almost normally. This growth regulation by ion concentration can be explained as a lateral inhibition mechanism of seeds sprayed in a small area.

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