Access

You are not currently logged in.

Access JSTOR through your library or other institution:

login

Log in through your institution.

Mechanics of root growth

A.R. DEXTER
Plant and Soil
Vol. 98, No. 3 (1987), pp. 303-312
Published by: Springer
Stable URL: http://www.jstor.org/stable/42936349
Page Count: 10
  • More info
  • Cite this Item
Mechanics of root growth
Preview not available

Abstract

A model is developed for the rate of elongation of a root tip in terms of the balance of pressures acting on the root. Differentials of this equation give expressions for the changes in root elongation rate with respect to soil water potential and soil mechanical resistance. The model predicts that root cells osmoregulate against both water stress and soil mechanical resistance with similar efficiencies which are less than 100%. Analysis of published data leads to the conclusion that root tips of pea osmoregulate with 70% efficiency. A working equation is developed for the elongation rate of roots in conditions of combined water stress and mechanical resistance.

Page Thumbnails

  • Thumbnail: Page 
303
    303
  • Thumbnail: Page 
304
    304
  • Thumbnail: Page 
305
    305
  • Thumbnail: Page 
306
    306
  • Thumbnail: Page 
307
    307
  • Thumbnail: Page 
308
    308
  • Thumbnail: Page 
309
    309
  • Thumbnail: Page 
310
    310
  • Thumbnail: Page 
311
    311
  • Thumbnail: Page 
312
    312