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This article in AJ

  1. Vol. 66 No. 5, p. 643-647
     
    Received: Nov 23, 1973


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doi:10.2134/agronj1974.00021962006600050012x

Water Uptake by Seeds as Affected by Water Stress, Capillary Conductivity, and Seed-Soil Water Contact. I. Experimental Study1

  1. A. Hadas and
  2. D. Russo2

Abstract

Abstract

Imbibition and seed germination as affected by water potentials, hydraulic conductivity, and seed-water contact area were studied. Water potential effects Were studied under perfect seed contact and unlimited hydraulic conductivity. Effects on imbibition and germination of by. draulic conductivity and seed-water contact were studied in an experimental setup in which separation between these factors was made possible while a very high water potential was maintained. The results show that low values of external water potential affect the rate of water uptake but not percent of germination. The rate of germination, however, is affected as long as water potential is higher than a critical value that is species specific. For a given seed-water contact area, any decreasein the hydraulic conductivity (or for a given conductivity, any reduction in contact area) reduced rates of water uptake and germination; total germination was not affected as long as the critical water potential was not reached.

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