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The Lpr of the apical zone (Zone-I) and whole roots of 16- to 20-day-old barley seminal roots, grown in aerated hydroponics, and measured with a root pressure probe under well-stirred conditions. The Lpr of the whole root is approx. 6-fold smaller than that of the apical zone (Zone-I). Values are the means ± s.d. of ten replicates. A significant difference of P ≤ 0·05 is denoted by * (two sample t-test).
