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Simulation of Hormone Transport in Petiole Segments of Coleus
Author(s) -
VEEN H.,
FRISSEL M. J.
Publication year - 1975
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1975.tb03823.x
Subject(s) - petiole (insect anatomy) , abscisic acid , diffusion , coleus , tracer , agar , chloride , acetic acid , chemistry , botany , biology , biochemistry , physics , thermodynamics , organic chemistry , hymenoptera , genetics , bacteria , nuclear physics , gene
Translocation and distribution of abscisic‐(1‐ 14 C) acid and of (5‐ 3 H)indol‐3yl‐acetic acid in agar cylinders and in boiled and fresh petiole segments of Coleus scutellarioides Bentham have been studied by liquid scintillation counting. The hormones were simultaneously applied in donor blocks of agar. Transport and distribution data of the two compounds were compared with those of ( 36 Cl ‐ )chloride in the same systems. From the data on movement in agar cylinders, diffusion coefficients of the transported compounds were approximated using a simulation model in which it was assumed that the movement was controlled by diffusion only. Movement in boiled tissue segments fitted the model if a correction factor was included in the equation for diffusion. Acropetal movement of indol‐3yl‐acetic acid in fresh petiole segments can be entirely explained in terms of passive transport and for basipetal transport it seems to be a major component. Movement of abscisic acid and of chloride in fresh petiole segments fit also a model based on diffusion. The limitations of the simulation model are discussed.