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Effect of low nutrient-solution pH during plant cultivation on pH-dependent plasmalemma ATPase activity. Plasmalemma was isolated from 3-week-old corn roots grown at pHe 6.0 (○) and 3.5 (•). Plasmalemma ATPase activity is expressed as the difference of activity assayed with and without 0.1 mm Na3VO4. Values represent means ± se of four replications. *, Significant difference at 5% level.
