Accumulation of Oxygen Gas in Excised Maize Root on Aging in Water, and Water Uptake by the Root

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概要

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• Transfer of excised maize root from wet sawdust to water caused a considerable reduction in the exudation rate of the root. After 1-day aging in water, the exudation rate increased about 8-fold and the exudation continued for 3 days. Osmotic pressure of the exudate from the root decreased with time after excision reaching almost zero in 2 days in spite of a high exudation rate. Concentrations of sugars, acids, Ca^<2+> and Mg^<2+> in the exudate decreased with the decrease of osmotic pressure, while the decrease in K^+ concentration delayed and Pi Concentration increased. The gas content of the root, especially of O_2, Increased during aging in water. The accumulated O_2 gas may promote water uptake, because degasification of the root by evacuation induced a decrease of water uptake. Also, the longitudinal gradient of the O_2 content in the root coincides with the gradient of water uptake intensity.

• 日本植物生理学会の論文

著者

• Takaoki Takeshi

  Botanical Institute Faculty Of Science Hiroshima University

関連論文

• A simple volumetric apparatus for measuring the rate of gas exchange in microorganisms
• Accumulation of Oxygen Gas in Excised Maize Root on Aging in Water, and Water Uptake by the Root

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