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The effect of 10 μM ABA and its combination with 10 μM diphenylene iodonium chloride (ABA + DPI) and 10 mM ascorbic acid (ABA + AA) on the flow rate of xylem sap (A), its osmotic pressure (B) and hydraulic conductivity (C) of detached roots of barley plants; (D) production of hydrogen peroxide in roots treated with ABA, AA and ABA + AA. Data represent the mean ± S.E. (n = 6). Significantly different means for each variable are labelled with different letters (p ≤ 0.05, LSD test).
