作物の根に於ける代謝生理(第2報) : 燐酸栄養と根の有機態燐無機化能力との関係

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Relationships between phosphorus nutrition and extracellular phosphatase activities of crop roots were studied with rice plant, wheat, and barley. The results may be summarised as follows : 1. Glycerophosphatase in crop roots, deficient in phosphorus, tends to have higher activity than that in the roots of normal constituents. This higher activity is also observed in the root, when they were ground or killed with chloroform vapor. (Table 1 and Fig. 1) 2. Other phosphatases - nuclease, monophenylphosphatase, diphenylphosphatase and pyrophosphatase - in crop roots. deficient in phosphorus, have also the same higher activity as glycerophosphatase. Both phytase and metaphosphatase are scarecely detectable, irrespectively to phosphorus nutrition. (Table 2) 3. Activity of glycerophosphatase in roots of rice plant increases apparently in proportion to the decrease of inorganic phosphorus concentration in plant tissues. (Fig. 2.) 4. Of both plants, rice plant and barley, phosphorus in nucleic acid is utilized more efficiently by the roots, deficient in phosphorus, than those of normal constituents. (Fig. 3) This higher ability of utilizing organic phosphorus of the roots is considered probably to due to their strong power of mineralizing organic phosphorus and absorbing inorganic phosphorus. At the above utilization, it is ascertained that organic phosphorus is mostly mineralized by extracellular enzyme of the roots, and so developed inorganic phosphorus is absorbed by them. (Fig. 3.)
社団法人日本土壌肥料学会の論文
1953-09-01

作物の根に於ける代謝生理(第2報) : 燐酸栄養と根の有機態燐無機化能力との関係

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