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Root pressure probe can be used to measure the hydraulic properties of whole root systems of corn (Zea mays L.)

Root pressure probes have been widely employed to measure the hydraulic properties of roots from various plants in the past two decades. However, they have not been used on the whole root systems of any gramineous seedling. Taking corn seedling as material, the feasibility of a root pressure probe determining hydraulic parameters of whole root systems was investigated in this study. Hydraulic conductivities of single root and root system grown hydroponically as well as soil-cultured corn seedlings were determined by root pressure probe, the values were 12.01 x 10(-8) m s(-1) MPa(-1), 10.88 x 10(-8) m s(-1) MPa(-1) and 8.56 x 10(-8) m s(-1) MPa(-1), respectively. The figures for the hydraulic conductivity of root systems grown tinder hydroponic culture and determined by pressure chamber (22.89 x 10(-8) m s(-1) MPa(-1)) were of the same order of magnitude. It was concluded that root pressure probes call be used to measure the hydraulic conductivity of corn seedling root system by connecting them to the mesocotyl rather than the stem.