Der Einfluss der Wasserstoffionenkonzentration in der Nährlösung auf die Reaktion in der Pflanze

The Influence of pH of Barley Tissues on the Symptoms Caused by Powdery Mildew (Erysiphe graminis DC)

“…The pH values obtained for the young plants of barley are in agreement with the results given by other authors (see review of DRAWERT 1955), Thus KEYSSNER (1931) obtained pH 6.0-6.2 in barley using chinhydrone electrode. But the rise of pH to the alkaline area during the senescence which was found in barley, is directly of opposite character with the findings in wheat (HURD 1924).…”

The Effect of Sodium Azide on the Exudation and Oxygen Consumption of Excised Plant Roots

“…It must be stressed, however, that also several other factors than the dissociation of the acid may contribute to the stronger effect in acid solutions. The pH of the plasm and sap and the dissociation of their constituents are also altered (data for barley and pea roots are given by Theron 1924 and for wheat roots by Keyssner 1931) and this may give the same result as altered dissociation of the poison. Recently it was shown that in ui'fro hydrazoic acid and not the azide anion combines with cytochrome oxidase (Stannard «& Horecker 1948).…”