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This article in AJ

  1. Vol. 86 No. 5, p. 767-774
     
    Received: Mar 22, 1993


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doi:10.2134/agronj1994.00021962008600050005x

Root Hydraulic Conductivity and Its Components, with Emphasis on Desert Succulents

  1. Bingru Huang and
  2. Park S. Nobel 
  1. D ep. of Crop and Soil Sci., Univ. of Georgia, Georgia Stn., Griffin, GA 30223
    D ep. of Biology and Lab. of Biomedical and Environ. Sci., Univ. of California, 900 Veteran Ave., Los Angeles, CA 90024-1786

Abstract

Abstract

Plant growth and development are often limited by the ability of roots to extract water and nutrients from the soil and to transport them to the shoots. The water absorption and transport ability of roots can be quantified by the hydraulic conductivity, LP. This quantity can be considered in terms of two components, the radial conductivity (LR) for water movement into the root and the axial conductance per unit pressure gradient (Kh) for water movement along the root xylem. The pathways for water movement through roots are discussed, and the hydraulic conductivities are expressed mathematically. The techniques currently used for determining LP, LR, and Kh are presented and conductivities for various plant species are compared. Recent experimental results on structural factors controlling LP and Kh together with the influences of two major environmental factors, temperature and soil water availability, are analyzed for roots of desert succulents. Interpreting the anatomical and physiological controls for LP, LR, and Kh and the variations caused by environmental factors is essential to understand the functioning of root systems for water uptake.

Presented as part of the symposium on rhizosphere research in honor of Howard M. Taylor, ASA-CSSA-SSSA annual meeting, Minneapolis, MN, 2 Nov. 1992; sponsored by Div. S-6, S-l, and S-7.

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