Drs. T.J. Bouma
State College
Dept. of Horticulture
103 Tyson Building
University Park
PA 16802
UNITED STATES
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A one cell thick slice of a cylinder shaped root is considered, consisting of
a number of concentric cell layers. Cell wall, cytoplasm and vacuole for each
concentric layer of one cell width, and the external medium are distinguished
as different compartments. Cellular compartments within the same concentric
cell layer are not regarded separately. The model simulates the time course of:
1. the fraction labelled ions in all cellular root compartments during loading
from a 100% labelled medium,
2. the contribution of ions from all cellular root compartments to the overall
efflux into the surrounding medium, from an initially 100% labelled root with
all compartments containing separate labels, and
3. the reallocation, with the cellular root compartments, of the ions remaining in
this initially 100% labelled root during the efflux period. Thus, the model continuously
accounts for the distribution of all ions, separately
labelled indicating the original location at the start of the calculations.
The efflux kinetics from wash-out experiments after a given loading period (i.
e. a not 100% labelled root), are derived by multiplying the simulated efflux
kinetics per compartment (ii) by the simulated fraction labelled ions in each
compartment at the end of the leading period (i).
CAMASE (Concerted Action for the development and testing of quantitative methods for research on Agricultural Systems and the Environment):