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Articles

Relationships between Root System Water Transport Properties and Plant Size in Phaseolus¹

Albert H. Markhart, III^b

^a Crops Research Laboratory, United States Department of Agriculture, Science and Education Administration, Agricultural Research, Colorado State University, Fort Collins, Colorado 80523, Department of Botany, Duke University, Durham, North Carolina 27706

Root system hydraulic conductivity (L_P) was measured on Phaseolus plants of different ages and sizes. Data analysis showed that L_P changed in a complex manner depending on plant size. As the plants increased in size, L_P increased initially then gradually decreased followed by a final modest increase. Values for L_P ranged between 0.8 x 10^–6 and 6.1 x 10^–6 centimeter per second per bar. Relationships between the root flow per unit leaf area at a pressure differential of 3 bars (QPL₃), as well as the total root system conductance (L_R), and plant size were also examined. Values for QPL₃ varied with plant size, somewhat like L_P. L_R values continuously increased with plant size at rates which depended on the growth rate of the root surface area as well as L_P. Comparison of our data with the root conductivity constant (k_r) of Taylor and Klepper (1975 Soil Sci, 120: 57-67) showed good agreement. The observations on Phaseolus were also confirmed for Glycine. Values for L_P and k_r of both species were within the same range.

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