If you need an accessible version of this item please contact JSTOR User Support

The Behaviour of Seeds in Soil: II. The Germination of Seeds on the Surface of a Water Supplying Substrate

J. L. Harper and R. A. Benton
Journal of Ecology
Vol. 54, No. 1 (Mar., 1966), pp. 151-166
DOI: 10.2307/2257664
Stable URL: http://www.jstor.org/stable/2257664
Page Count: 16
  • Download PDF
  • Cite this Item

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support
The Behaviour of Seeds in Soil: II. The Germination of Seeds on the Surface of a Water Supplying Substrate
Preview not available

Abstract

Seeds of various species were sown on the exposed surfaces of sintered glass plates arranged to supply water under controlled tensions. Germination of many species was markedly influenced by tensions between 0 and 200 cm of water. Mucilaginous seeds showed least sensitivity to tension and spiny and reticulate seeds were particularly sensitive. Seeds with smooth testas showed a graded response to tension, small seeds being less and large seeds more sensitive. Seeds sown on slate dusts at controlled water tension were influenced in germination by tension (at constant water content) and by water content (at constant tension). The dependence of germination on the applied water tension was greatly reduced when the sinter or slate dust surfaces were protected from evaporation. The results of these experiments are interpreted in terms of the area of contact made between seed and substrate, and the degree of exposure of the seed to the atmosphere. A heat flow analogy is discussed. The significance of these findings is discussed in relation to the interpretation of seed size and the establishment of plants from seed under natural conditions.

Page Thumbnails

  • Thumbnail: Page 
151
    151
  • Thumbnail: Page 
152
    152
  • Thumbnail: Page 
153
    153
  • Thumbnail: Page 
154
    154
  • Thumbnail: Page 
155
    155
  • Thumbnail: Page 
156
    156
  • Thumbnail: Page 
157
    157
  • Thumbnail: Page 
158
    158
  • Thumbnail: Page 
159
    159
  • Thumbnail: Page 
160
    160
  • Thumbnail: Page 
161
    161
  • Thumbnail: Page 
162
    162
  • Thumbnail: Page 
163
    163
  • Thumbnail: Page 
164
    164
  • Thumbnail: Page 
165
    165
  • Thumbnail: Page 
166
    166