Fig. 4.

Water flux density (J_s) of Citrus volkameriana root orders 1–4 under (A) fresh water (control), (B) salinity, and (C) stress release conditions. Plants were placed either in 1.0 strength LA (A) or 1.0 strength LA + 90 mM NaCl (B, C). The miniature depletion chambers were filled with either 0.5 strength LA (A, C) or 0.5 LA + 90 mM NaCl (B), respectively. Different lower case letters denote significant differences between root order-specific flux densities; different upper case letters denote significant differences between treatments (mean ±SE; Mann–Whitney U-test, P < 0.05, n=5–11). Mean water flux densities ($J_{\stackrel{-}{\mathrm{s}}}$) of root branches of 1 g d.wt. are given.