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RADIOAUTOGRAPHIC STUDY OF TRANSLOCATION IN BEAN LEAVES
Author(s) -
Nakata S.,
Leopold A. C.
Publication year - 1967
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1967.tb10698.x
Subject(s) - petiole (insect anatomy) , biology , chromosomal translocation , phloem , sucrose , botany , phosphate , mobilization , biochemistry , gene , history , hymenoptera , archaeology
The movement of the radioactivity from sucrose, indole‐3‐acetic acid (IAA) and phosphate has been examined in excised bean leaves. Preferential translocation of the labelled materials toward the base of leaf and petiole was demonstrated, suggesting a natural mobilization gradient down the leaf and petiole. Establishment of other mobilization centers in the leaf by local application of N 6 ‐benzyladenine diverted the movement of the sucrose label and, to a lesser extent, the phosphate label. There was no apparent mobilization of IAA by benzyladenine. Evidence is provided that there is a continuity of label from the source to the sink regions, and it is suggested that reported instances of noncontinuity of label may be attributable to the refixation of respired C 14 O 2 by tissue treated with benzyladenine. The observations appear to substantiate the concept that the unloading of solutes from the phloem can regulate the direction and intensity of translocation.