トウモロコシのカリウム欠乏耐性を異にする二種類の自殖系統の比較

概要

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Two inbreds of Zea mays, tolerant to K^+ deficiency and control, were grown in the presence of different concentrations of K^+. Several parameters were compared between the two inbreds and characteristic differences in terms of K^+ utilization were observed. 1. The dry weight of both inbreds was nearly the same in the presence of a sufficient concentration of K^+, but was apparently higher in the tolerant inbred than the control inbred according to the decreasing amount of K^+ supply. 2. Symptoms of K^+ deficiency in the tolerant inbred appeared only with complete absence of K^+, but those in the control inbred could be observed even at a decreased level of K^+ supply. 3. The increased length of the main root and top to root ratio in the control inbred were conspicuously lower than those of the tolerant inbred due to K^+ deficiency. Furthermore, the amout of lateral roots of the cotrol inbred was approximately one-half to one-fourth of that of the tolerant inbred. 4. The capability of K^+ absorption by the roots treated for K^+ deficiency was higher in the tolerant inbred than in the controel inbred. The difference in the capability became larger when assayed with decreasing concentrations of K^+. 5. K^+-dependent H^+ extrusion from roots treated for K^+ deficiency was larger in the tolerant inbred than in the control inbred.
社団法人日本土壌肥料学会の論文
1997-12-05