Mechanics of root growth |
| |
Authors: | A R Dexter |
| |
Institution: | (1) Waite Agricultural Research Institute, The University of Adelaide, 5064 Glen Osmond, South Australia |
| |
Abstract: | Summary 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
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. |
| |
Keywords: | Elongation Extensibility Mechanical stress Osmoregulation Soil strength Water stress |
本文献已被 SpringerLink 等数据库收录! |