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RATES OF INCORPORATION OF LABEL FROM d ‐[ 14 C]GLUCOSE INTO DIFFERENT REGIONS OF THE ROOT‐TIP OF MAIZE ( ZEA MAYS L.)
Author(s) -
ROBERTS R. M.,
BUTT V. S.
Publication year - 1967
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1967.tb05428.x
Subject(s) - zea mays , pith , chemistry , saturation (graph theory) , epidermis (zoology) , botany , root hair , penetration (warfare) , tracer , cortex (anatomy) , biophysics , biochemistry , biology , anatomy , agronomy , physics , mathematics , combinatorics , operations research , neuroscience , nuclear physics , engineering , gene
S ummary When D‐[U‐ 14 C]glucose was supplied externally to root‐tips of maize, uptake was linear with time, but saturation rates of incorporation into the ethanol‐xylene‐water insoluble fractions were not achieved simultaneously by the different tissues. The more deeply lying cortex and pith required longer periods to reach steady state rates than the outer regions of the root. Thus, after 30 minutes, autoradiographs showed label to be present only in the epidermis, outer cortex and marginal cells of the cap but, after 4 hours, each of the regions appeared to have reached saturation. It could not be determined how far these differences in incorporation rates were due to higher synthetic activity in the outer tissues and hence a more rapid equilibration of labelled compound with the precursor pools, or to the penetration of the tracer compound to successive tissues of the root.